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<!DOCTYPE html><meta charset="UTF-8"><meta http-equiv="Content-Language" content="en" /><title>iter.js</title><link href="../../../../dossier.css" rel="stylesheet" type="text/css"><div id="main-wrapper"><input type="checkbox" id="sidenav-toggle" /><main><header><h1>lib/goog/iter/iter.js</h1></header><pre><table class="srcfile"><tbody><tr><td><a name="l1" href="#l1">1</a><td>// Copyright 2007 The Closure Library Authors. All Rights Reserved.<tr><td><a name="l2" href="#l2">2</a><td>//<tr><td><a name="l3" href="#l3">3</a><td>// Licensed under the Apache License, Version 2.0 (the "License");<tr><td><a name="l4" href="#l4">4</a><td>// you may not use this file except in compliance with the License.<tr><td><a name="l5" href="#l5">5</a><td>// You may obtain a copy of the License at<tr><td><a name="l6" href="#l6">6</a><td>//<tr><td><a name="l7" href="#l7">7</a><td>// http://www.apache.org/licenses/LICENSE-2.0<tr><td><a name="l8" href="#l8">8</a><td>//<tr><td><a name="l9" href="#l9">9</a><td>// Unless required by applicable law or agreed to in writing, software<tr><td><a name="l10" href="#l10">10</a><td>// distributed under the License is distributed on an "AS-IS" BASIS,<tr><td><a name="l11" href="#l11">11</a><td>// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<tr><td><a name="l12" href="#l12">12</a><td>// See the License for the specific language governing permissions and<tr><td><a name="l13" href="#l13">13</a><td>// limitations under the License.<tr><td><a name="l14" href="#l14">14</a><td><tr><td><a name="l15" href="#l15">15</a><td>/**<tr><td><a name="l16" href="#l16">16</a><td> * @fileoverview Python style iteration utilities.<tr><td><a name="l17" href="#l17">17</a><td> * @author arv@google.com (Erik Arvidsson)<tr><td><a name="l18" href="#l18">18</a><td> */<tr><td><a name="l19" href="#l19">19</a><td><tr><td><a name="l20" href="#l20">20</a><td><tr><td><a name="l21" href="#l21">21</a><td>goog.provide('goog.iter');<tr><td><a name="l22" href="#l22">22</a><td>goog.provide('goog.iter.Iterable');<tr><td><a name="l23" href="#l23">23</a><td>goog.provide('goog.iter.Iterator');<tr><td><a name="l24" href="#l24">24</a><td>goog.provide('goog.iter.StopIteration');<tr><td><a name="l25" href="#l25">25</a><td><tr><td><a name="l26" href="#l26">26</a><td>goog.require('goog.array');<tr><td><a name="l27" href="#l27">27</a><td>goog.require('goog.asserts');<tr><td><a name="l28" href="#l28">28</a><td>goog.require('goog.functions');<tr><td><a name="l29" href="#l29">29</a><td>goog.require('goog.math');<tr><td><a name="l30" href="#l30">30</a><td><tr><td><a name="l31" href="#l31">31</a><td><tr><td><a name="l32" href="#l32">32</a><td>/**<tr><td><a name="l33" href="#l33">33</a><td> * @typedef {goog.iter.Iterator|{length:number}|{__iterator__}}<tr><td><a name="l34" href="#l34">34</a><td> */<tr><td><a name="l35" href="#l35">35</a><td>goog.iter.Iterable;<tr><td><a name="l36" href="#l36">36</a><td><tr><td><a name="l37" href="#l37">37</a><td><tr><td><a name="l38" href="#l38">38</a><td>// For script engines that already support iterators.<tr><td><a name="l39" href="#l39">39</a><td>if ('StopIteration' in goog.global) {<tr><td><a name="l40" href="#l40">40</a><td> /**<tr><td><a name="l41" href="#l41">41</a><td> * Singleton Error object that is used to terminate iterations.<tr><td><a name="l42" href="#l42">42</a><td> * @type {Error}<tr><td><a name="l43" href="#l43">43</a><td> */<tr><td><a name="l44" href="#l44">44</a><td> goog.iter.StopIteration = goog.global['StopIteration'];<tr><td><a name="l45" href="#l45">45</a><td>} else {<tr><td><a name="l46" href="#l46">46</a><td> /**<tr><td><a name="l47" href="#l47">47</a><td> * Singleton Error object that is used to terminate iterations.<tr><td><a name="l48" href="#l48">48</a><td> * @type {Error}<tr><td><a name="l49" href="#l49">49</a><td> * @suppress {duplicate}<tr><td><a name="l50" href="#l50">50</a><td> */<tr><td><a name="l51" href="#l51">51</a><td> goog.iter.StopIteration = Error('StopIteration');<tr><td><a name="l52" href="#l52">52</a><td>}<tr><td><a name="l53" href="#l53">53</a><td><tr><td><a name="l54" href="#l54">54</a><td><tr><td><a name="l55" href="#l55">55</a><td><tr><td><a name="l56" href="#l56">56</a><td>/**<tr><td><a name="l57" href="#l57">57</a><td> * Class/interface for iterators. An iterator needs to implement a {@code next}<tr><td><a name="l58" href="#l58">58</a><td> * method and it needs to throw a {@code goog.iter.StopIteration} when the<tr><td><a name="l59" href="#l59">59</a><td> * iteration passes beyond the end. Iterators have no {@code hasNext} method.<tr><td><a name="l60" href="#l60">60</a><td> * It is recommended to always use the helper functions to iterate over the<tr><td><a name="l61" href="#l61">61</a><td> * iterator or in case you are only targeting JavaScript 1.7 for in loops.<tr><td><a name="l62" href="#l62">62</a><td> * @constructor<tr><td><a name="l63" href="#l63">63</a><td> * @template VALUE<tr><td><a name="l64" href="#l64">64</a><td> */<tr><td><a name="l65" href="#l65">65</a><td>goog.iter.Iterator = function() {};<tr><td><a name="l66" href="#l66">66</a><td><tr><td><a name="l67" href="#l67">67</a><td><tr><td><a name="l68" href="#l68">68</a><td>/**<tr><td><a name="l69" href="#l69">69</a><td> * Returns the next value of the iteration. This will throw the object<tr><td><a name="l70" href="#l70">70</a><td> * {@see goog.iter#StopIteration} when the iteration passes the end.<tr><td><a name="l71" href="#l71">71</a><td> * @return {VALUE} Any object or value.<tr><td><a name="l72" href="#l72">72</a><td> */<tr><td><a name="l73" href="#l73">73</a><td>goog.iter.Iterator.prototype.next = function() {<tr><td><a name="l74" href="#l74">74</a><td> throw goog.iter.StopIteration;<tr><td><a name="l75" href="#l75">75</a><td>};<tr><td><a name="l76" href="#l76">76</a><td><tr><td><a name="l77" href="#l77">77</a><td><tr><td><a name="l78" href="#l78">78</a><td>/**<tr><td><a name="l79" href="#l79">79</a><td> * Returns the {@code Iterator} object itself. This is used to implement<tr><td><a name="l80" href="#l80">80</a><td> * the iterator protocol in JavaScript 1.7<tr><td><a name="l81" href="#l81">81</a><td> * @param {boolean=} opt_keys Whether to return the keys or values. Default is<tr><td><a name="l82" href="#l82">82</a><td> * to only return the values. This is being used by the for-in loop (true)<tr><td><a name="l83" href="#l83">83</a><td> * and the for-each-in loop (false). Even though the param gives a hint<tr><td><a name="l84" href="#l84">84</a><td> * about what the iterator will return there is no guarantee that it will<tr><td><a name="l85" href="#l85">85</a><td> * return the keys when true is passed.<tr><td><a name="l86" href="#l86">86</a><td> * @return {!goog.iter.Iterator.<VALUE>} The object itself.<tr><td><a name="l87" href="#l87">87</a><td> */<tr><td><a name="l88" href="#l88">88</a><td>goog.iter.Iterator.prototype.__iterator__ = function(opt_keys) {<tr><td><a name="l89" href="#l89">89</a><td> return this;<tr><td><a name="l90" href="#l90">90</a><td>};<tr><td><a name="l91" href="#l91">91</a><td><tr><td><a name="l92" href="#l92">92</a><td><tr><td><a name="l93" href="#l93">93</a><td>/**<tr><td><a name="l94" href="#l94">94</a><td> * Returns an iterator that knows how to iterate over the values in the object.<tr><td><a name="l95" href="#l95">95</a><td> * @param {goog.iter.Iterator.<VALUE>|goog.iter.Iterable} iterable If the<tr><td><a name="l96" href="#l96">96</a><td> * object is an iterator it will be returned as is. If the object has an<tr><td><a name="l97" href="#l97">97</a><td> * {@code __iterator__} method that will be called to get the value<tr><td><a name="l98" href="#l98">98</a><td> * iterator. If the object is an array-like object we create an iterator<tr><td><a name="l99" href="#l99">99</a><td> * for that.<tr><td><a name="l100" href="#l100">100</a><td> * @return {!goog.iter.Iterator.<VALUE>} An iterator that knows how to iterate<tr><td><a name="l101" href="#l101">101</a><td> * over the values in {@code iterable}.<tr><td><a name="l102" href="#l102">102</a><td> * @template VALUE<tr><td><a name="l103" href="#l103">103</a><td> */<tr><td><a name="l104" href="#l104">104</a><td>goog.iter.toIterator = function(iterable) {<tr><td><a name="l105" href="#l105">105</a><td> if (iterable instanceof goog.iter.Iterator) {<tr><td><a name="l106" href="#l106">106</a><td> return iterable;<tr><td><a name="l107" href="#l107">107</a><td> }<tr><td><a name="l108" href="#l108">108</a><td> if (typeof iterable.__iterator__ == 'function') {<tr><td><a name="l109" href="#l109">109</a><td> return iterable.__iterator__(false);<tr><td><a name="l110" href="#l110">110</a><td> }<tr><td><a name="l111" href="#l111">111</a><td> if (goog.isArrayLike(iterable)) {<tr><td><a name="l112" href="#l112">112</a><td> var i = 0;<tr><td><a name="l113" href="#l113">113</a><td> var newIter = new goog.iter.Iterator;<tr><td><a name="l114" href="#l114">114</a><td> newIter.next = function() {<tr><td><a name="l115" href="#l115">115</a><td> while (true) {<tr><td><a name="l116" href="#l116">116</a><td> if (i >= iterable.length) {<tr><td><a name="l117" href="#l117">117</a><td> throw goog.iter.StopIteration;<tr><td><a name="l118" href="#l118">118</a><td> }<tr><td><a name="l119" href="#l119">119</a><td> // Don't include deleted elements.<tr><td><a name="l120" href="#l120">120</a><td> if (!(i in iterable)) {<tr><td><a name="l121" href="#l121">121</a><td> i++;<tr><td><a name="l122" href="#l122">122</a><td> continue;<tr><td><a name="l123" href="#l123">123</a><td> }<tr><td><a name="l124" href="#l124">124</a><td> return iterable[i++];<tr><td><a name="l125" href="#l125">125</a><td> }<tr><td><a name="l126" href="#l126">126</a><td> };<tr><td><a name="l127" href="#l127">127</a><td> return newIter;<tr><td><a name="l128" href="#l128">128</a><td> }<tr><td><a name="l129" href="#l129">129</a><td><tr><td><a name="l130" href="#l130">130</a><td><tr><td><a name="l131" href="#l131">131</a><td> // TODO(arv): Should we fall back on goog.structs.getValues()?<tr><td><a name="l132" href="#l132">132</a><td> throw Error('Not implemented');<tr><td><a name="l133" href="#l133">133</a><td>};<tr><td><a name="l134" href="#l134">134</a><td><tr><td><a name="l135" href="#l135">135</a><td><tr><td><a name="l136" href="#l136">136</a><td>/**<tr><td><a name="l137" href="#l137">137</a><td> * Calls a function for each element in the iterator with the element of the<tr><td><a name="l138" href="#l138">138</a><td> * iterator passed as argument.<tr><td><a name="l139" href="#l139">139</a><td> *<tr><td><a name="l140" href="#l140">140</a><td> * @param {goog.iter.Iterator.<VALUE>|goog.iter.Iterable} iterable The iterator<tr><td><a name="l141" href="#l141">141</a><td> * to iterate over. If the iterable is an object {@code toIterator} will be<tr><td><a name="l142" href="#l142">142</a><td> * called on it.<tr><td><a name="l143" href="#l143">143</a><td> * @param {function(this:THIS,VALUE,undefined,goog.iter.Iterator.<VALUE>)|<tr><td><a name="l144" href="#l144">144</a><td> * function(this:THIS,number,undefined,goog.iter.Iterator.<VALUE>)} f<tr><td><a name="l145" href="#l145">145</a><td> * The function to call for every element. This function takes 3 arguments<tr><td><a name="l146" href="#l146">146</a><td> * (the element, undefined, and the iterator) and the return value is<tr><td><a name="l147" href="#l147">147</a><td> * irrelevant. The reason for passing undefined as the second argument is<tr><td><a name="l148" href="#l148">148</a><td> * so that the same function can be used in {@see goog.array#forEach} as<tr><td><a name="l149" href="#l149">149</a><td> * well as others.<tr><td><a name="l150" href="#l150">150</a><td> * @param {THIS=} opt_obj The object to be used as the value of 'this' within<tr><td><a name="l151" href="#l151">151</a><td> * {@code f}.<tr><td><a name="l152" href="#l152">152</a><td> * @template THIS, VALUE<tr><td><a name="l153" href="#l153">153</a><td> */<tr><td><a name="l154" href="#l154">154</a><td>goog.iter.forEach = function(iterable, f, opt_obj) {<tr><td><a name="l155" href="#l155">155</a><td> if (goog.isArrayLike(iterable)) {<tr><td><a name="l156" href="#l156">156</a><td> /** @preserveTry */<tr><td><a name="l157" href="#l157">157</a><td> try {<tr><td><a name="l158" href="#l158">158</a><td> // NOTES: this passes the index number to the second parameter<tr><td><a name="l159" href="#l159">159</a><td> // of the callback contrary to the documentation above.<tr><td><a name="l160" href="#l160">160</a><td> goog.array.forEach(/** @type {goog.array.ArrayLike} */(iterable), f,<tr><td><a name="l161" href="#l161">161</a><td> opt_obj);<tr><td><a name="l162" href="#l162">162</a><td> } catch (ex) {<tr><td><a name="l163" href="#l163">163</a><td> if (ex !== goog.iter.StopIteration) {<tr><td><a name="l164" href="#l164">164</a><td> throw ex;<tr><td><a name="l165" href="#l165">165</a><td> }<tr><td><a name="l166" href="#l166">166</a><td> }<tr><td><a name="l167" href="#l167">167</a><td> } else {<tr><td><a name="l168" href="#l168">168</a><td> iterable = goog.iter.toIterator(iterable);<tr><td><a name="l169" href="#l169">169</a><td> /** @preserveTry */<tr><td><a name="l170" href="#l170">170</a><td> try {<tr><td><a name="l171" href="#l171">171</a><td> while (true) {<tr><td><a name="l172" href="#l172">172</a><td> f.call(opt_obj, iterable.next(), undefined, iterable);<tr><td><a name="l173" href="#l173">173</a><td> }<tr><td><a name="l174" href="#l174">174</a><td> } catch (ex) {<tr><td><a name="l175" href="#l175">175</a><td> if (ex !== goog.iter.StopIteration) {<tr><td><a name="l176" href="#l176">176</a><td> throw ex;<tr><td><a name="l177" href="#l177">177</a><td> }<tr><td><a name="l178" href="#l178">178</a><td> }<tr><td><a name="l179" href="#l179">179</a><td> }<tr><td><a name="l180" href="#l180">180</a><td>};<tr><td><a name="l181" href="#l181">181</a><td><tr><td><a name="l182" href="#l182">182</a><td><tr><td><a name="l183" href="#l183">183</a><td>/**<tr><td><a name="l184" href="#l184">184</a><td> * Calls a function for every element in the iterator, and if the function<tr><td><a name="l185" href="#l185">185</a><td> * returns true adds the element to a new iterator.<tr><td><a name="l186" href="#l186">186</a><td> *<tr><td><a name="l187" href="#l187">187</a><td> * @param {goog.iter.Iterator.<VALUE>|goog.iter.Iterable} iterable The iterator<tr><td><a name="l188" href="#l188">188</a><td> * to iterate over.<tr><td><a name="l189" href="#l189">189</a><td> * @param {<tr><td><a name="l190" href="#l190">190</a><td> * function(this:THIS,VALUE,undefined,goog.iter.Iterator.<VALUE>):boolean} f<tr><td><a name="l191" href="#l191">191</a><td> * The function to call for every element. This function takes 3 arguments<tr><td><a name="l192" href="#l192">192</a><td> * (the element, undefined, and the iterator) and should return a boolean.<tr><td><a name="l193" href="#l193">193</a><td> * If the return value is true the element will be included in the returned<tr><td><a name="l194" href="#l194">194</a><td> * iterator. If it is false the element is not included.<tr><td><a name="l195" href="#l195">195</a><td> * @param {THIS=} opt_obj The object to be used as the value of 'this' within<tr><td><a name="l196" href="#l196">196</a><td> * {@code f}.<tr><td><a name="l197" href="#l197">197</a><td> * @return {!goog.iter.Iterator.<VALUE>} A new iterator in which only elements<tr><td><a name="l198" href="#l198">198</a><td> * that passed the test are present.<tr><td><a name="l199" href="#l199">199</a><td> * @template THIS, VALUE<tr><td><a name="l200" href="#l200">200</a><td> */<tr><td><a name="l201" href="#l201">201</a><td>goog.iter.filter = function(iterable, f, opt_obj) {<tr><td><a name="l202" href="#l202">202</a><td> var iterator = goog.iter.toIterator(iterable);<tr><td><a name="l203" href="#l203">203</a><td> var newIter = new goog.iter.Iterator;<tr><td><a name="l204" href="#l204">204</a><td> newIter.next = function() {<tr><td><a name="l205" href="#l205">205</a><td> while (true) {<tr><td><a name="l206" href="#l206">206</a><td> var val = iterator.next();<tr><td><a name="l207" href="#l207">207</a><td> if (f.call(opt_obj, val, undefined, iterator)) {<tr><td><a name="l208" href="#l208">208</a><td> return val;<tr><td><a name="l209" href="#l209">209</a><td> }<tr><td><a name="l210" href="#l210">210</a><td> }<tr><td><a name="l211" href="#l211">211</a><td> };<tr><td><a name="l212" href="#l212">212</a><td> return newIter;<tr><td><a name="l213" href="#l213">213</a><td>};<tr><td><a name="l214" href="#l214">214</a><td><tr><td><a name="l215" href="#l215">215</a><td><tr><td><a name="l216" href="#l216">216</a><td>/**<tr><td><a name="l217" href="#l217">217</a><td> * Calls a function for every element in the iterator, and if the function<tr><td><a name="l218" href="#l218">218</a><td> * returns false adds the element to a new iterator.<tr><td><a name="l219" href="#l219">219</a><td> *<tr><td><a name="l220" href="#l220">220</a><td> * @param {goog.iter.Iterator.<VALUE>|goog.iter.Iterable} iterable The iterator<tr><td><a name="l221" href="#l221">221</a><td> * to iterate over.<tr><td><a name="l222" href="#l222">222</a><td> * @param {<tr><td><a name="l223" href="#l223">223</a><td> * function(this:THIS,VALUE,undefined,goog.iter.Iterator.<VALUE>):boolean} f<tr><td><a name="l224" href="#l224">224</a><td> * The function to call for every element. This function takes 3 arguments<tr><td><a name="l225" href="#l225">225</a><td> * (the element, undefined, and the iterator) and should return a boolean.<tr><td><a name="l226" href="#l226">226</a><td> * If the return value is false the element will be included in the returned<tr><td><a name="l227" href="#l227">227</a><td> * iterator. If it is true the element is not included.<tr><td><a name="l228" href="#l228">228</a><td> * @param {THIS=} opt_obj The object to be used as the value of 'this' within<tr><td><a name="l229" href="#l229">229</a><td> * {@code f}.<tr><td><a name="l230" href="#l230">230</a><td> * @return {!goog.iter.Iterator.<VALUE>} A new iterator in which only elements<tr><td><a name="l231" href="#l231">231</a><td> * that did not pass the test are present.<tr><td><a name="l232" href="#l232">232</a><td> * @template THIS, VALUE<tr><td><a name="l233" href="#l233">233</a><td> */<tr><td><a name="l234" href="#l234">234</a><td>goog.iter.filterFalse = function(iterable, f, opt_obj) {<tr><td><a name="l235" href="#l235">235</a><td> return goog.iter.filter(iterable, goog.functions.not(f), opt_obj);<tr><td><a name="l236" href="#l236">236</a><td>};<tr><td><a name="l237" href="#l237">237</a><td><tr><td><a name="l238" href="#l238">238</a><td><tr><td><a name="l239" href="#l239">239</a><td>/**<tr><td><a name="l240" href="#l240">240</a><td> * Creates a new iterator that returns the values in a range. This function<tr><td><a name="l241" href="#l241">241</a><td> * can take 1, 2 or 3 arguments:<tr><td><a name="l242" href="#l242">242</a><td> * <pre><tr><td><a name="l243" href="#l243">243</a><td> * range(5) same as range(0, 5, 1)<tr><td><a name="l244" href="#l244">244</a><td> * range(2, 5) same as range(2, 5, 1)<tr><td><a name="l245" href="#l245">245</a><td> * </pre><tr><td><a name="l246" href="#l246">246</a><td> *<tr><td><a name="l247" href="#l247">247</a><td> * @param {number} startOrStop The stop value if only one argument is provided.<tr><td><a name="l248" href="#l248">248</a><td> * The start value if 2 or more arguments are provided. If only one<tr><td><a name="l249" href="#l249">249</a><td> * argument is used the start value is 0.<tr><td><a name="l250" href="#l250">250</a><td> * @param {number=} opt_stop The stop value. If left out then the first<tr><td><a name="l251" href="#l251">251</a><td> * argument is used as the stop value.<tr><td><a name="l252" href="#l252">252</a><td> * @param {number=} opt_step The number to increment with between each call to<tr><td><a name="l253" href="#l253">253</a><td> * next. This can be negative.<tr><td><a name="l254" href="#l254">254</a><td> * @return {!goog.iter.Iterator.<number>} A new iterator that returns the values<tr><td><a name="l255" href="#l255">255</a><td> * in the range.<tr><td><a name="l256" href="#l256">256</a><td> */<tr><td><a name="l257" href="#l257">257</a><td>goog.iter.range = function(startOrStop, opt_stop, opt_step) {<tr><td><a name="l258" href="#l258">258</a><td> var start = 0;<tr><td><a name="l259" href="#l259">259</a><td> var stop = startOrStop;<tr><td><a name="l260" href="#l260">260</a><td> var step = opt_step || 1;<tr><td><a name="l261" href="#l261">261</a><td> if (arguments.length > 1) {<tr><td><a name="l262" href="#l262">262</a><td> start = startOrStop;<tr><td><a name="l263" href="#l263">263</a><td> stop = opt_stop;<tr><td><a name="l264" href="#l264">264</a><td> }<tr><td><a name="l265" href="#l265">265</a><td> if (step == 0) {<tr><td><a name="l266" href="#l266">266</a><td> throw Error('Range step argument must not be zero');<tr><td><a name="l267" href="#l267">267</a><td> }<tr><td><a name="l268" href="#l268">268</a><td><tr><td><a name="l269" href="#l269">269</a><td> var newIter = new goog.iter.Iterator;<tr><td><a name="l270" href="#l270">270</a><td> newIter.next = function() {<tr><td><a name="l271" href="#l271">271</a><td> if (step > 0 && start >= stop || step < 0 && start <= stop) {<tr><td><a name="l272" href="#l272">272</a><td> throw goog.iter.StopIteration;<tr><td><a name="l273" href="#l273">273</a><td> }<tr><td><a name="l274" href="#l274">274</a><td> var rv = start;<tr><td><a name="l275" href="#l275">275</a><td> start += step;<tr><td><a name="l276" href="#l276">276</a><td> return rv;<tr><td><a name="l277" href="#l277">277</a><td> };<tr><td><a name="l278" href="#l278">278</a><td> return newIter;<tr><td><a name="l279" href="#l279">279</a><td>};<tr><td><a name="l280" href="#l280">280</a><td><tr><td><a name="l281" href="#l281">281</a><td><tr><td><a name="l282" href="#l282">282</a><td>/**<tr><td><a name="l283" href="#l283">283</a><td> * Joins the values in a iterator with a delimiter.<tr><td><a name="l284" href="#l284">284</a><td> * @param {goog.iter.Iterator.<VALUE>|goog.iter.Iterable} iterable The iterator<tr><td><a name="l285" href="#l285">285</a><td> * to get the values from.<tr><td><a name="l286" href="#l286">286</a><td> * @param {string} deliminator The text to put between the values.<tr><td><a name="l287" href="#l287">287</a><td> * @return {string} The joined value string.<tr><td><a name="l288" href="#l288">288</a><td> * @template VALUE<tr><td><a name="l289" href="#l289">289</a><td> */<tr><td><a name="l290" href="#l290">290</a><td>goog.iter.join = function(iterable, deliminator) {<tr><td><a name="l291" href="#l291">291</a><td> return goog.iter.toArray(iterable).join(deliminator);<tr><td><a name="l292" href="#l292">292</a><td>};<tr><td><a name="l293" href="#l293">293</a><td><tr><td><a name="l294" href="#l294">294</a><td><tr><td><a name="l295" href="#l295">295</a><td>/**<tr><td><a name="l296" href="#l296">296</a><td> * For every element in the iterator call a function and return a new iterator<tr><td><a name="l297" href="#l297">297</a><td> * with that value.<tr><td><a name="l298" href="#l298">298</a><td> *<tr><td><a name="l299" href="#l299">299</a><td> * @param {!goog.iter.Iterator.<VALUE>|!goog.iter.Iterable} iterable The<tr><td><a name="l300" href="#l300">300</a><td> * iterator to iterate over.<tr><td><a name="l301" href="#l301">301</a><td> * @param {<tr><td><a name="l302" href="#l302">302</a><td> * function(this:THIS,VALUE,undefined,!goog.iter.Iterator.<VALUE>):RESULT} f<tr><td><a name="l303" href="#l303">303</a><td> * The function to call for every element. This function takes 3 arguments<tr><td><a name="l304" href="#l304">304</a><td> * (the element, undefined, and the iterator) and should return a new value.<tr><td><a name="l305" href="#l305">305</a><td> * @param {THIS=} opt_obj The object to be used as the value of 'this' within<tr><td><a name="l306" href="#l306">306</a><td> * {@code f}.<tr><td><a name="l307" href="#l307">307</a><td> * @return {!goog.iter.Iterator.<RESULT>} A new iterator that returns the<tr><td><a name="l308" href="#l308">308</a><td> * results of applying the function to each element in the original<tr><td><a name="l309" href="#l309">309</a><td> * iterator.<tr><td><a name="l310" href="#l310">310</a><td> * @template THIS, VALUE, RESULT<tr><td><a name="l311" href="#l311">311</a><td> */<tr><td><a name="l312" href="#l312">312</a><td>goog.iter.map = function(iterable, f, opt_obj) {<tr><td><a name="l313" href="#l313">313</a><td> var iterator = goog.iter.toIterator(iterable);<tr><td><a name="l314" href="#l314">314</a><td> var newIter = new goog.iter.Iterator;<tr><td><a name="l315" href="#l315">315</a><td> newIter.next = function() {<tr><td><a name="l316" href="#l316">316</a><td> var val = iterator.next();<tr><td><a name="l317" href="#l317">317</a><td> return f.call(opt_obj, val, undefined, iterator);<tr><td><a name="l318" href="#l318">318</a><td> };<tr><td><a name="l319" href="#l319">319</a><td> return newIter;<tr><td><a name="l320" href="#l320">320</a><td>};<tr><td><a name="l321" href="#l321">321</a><td><tr><td><a name="l322" href="#l322">322</a><td><tr><td><a name="l323" href="#l323">323</a><td>/**<tr><td><a name="l324" href="#l324">324</a><td> * Passes every element of an iterator into a function and accumulates the<tr><td><a name="l325" href="#l325">325</a><td> * result.<tr><td><a name="l326" href="#l326">326</a><td> *<tr><td><a name="l327" href="#l327">327</a><td> * @param {goog.iter.Iterator.<VALUE>|goog.iter.Iterable} iterable The iterator<tr><td><a name="l328" href="#l328">328</a><td> * to iterate over.<tr><td><a name="l329" href="#l329">329</a><td> * @param {function(this:THIS,VALUE,VALUE):VALUE} f The function to call for<tr><td><a name="l330" href="#l330">330</a><td> * every element. This function takes 2 arguments (the function's previous<tr><td><a name="l331" href="#l331">331</a><td> * result or the initial value, and the value of the current element).<tr><td><a name="l332" href="#l332">332</a><td> * function(previousValue, currentElement) : newValue.<tr><td><a name="l333" href="#l333">333</a><td> * @param {VALUE} val The initial value to pass into the function on the first<tr><td><a name="l334" href="#l334">334</a><td> * call.<tr><td><a name="l335" href="#l335">335</a><td> * @param {THIS=} opt_obj The object to be used as the value of 'this' within<tr><td><a name="l336" href="#l336">336</a><td> * f.<tr><td><a name="l337" href="#l337">337</a><td> * @return {VALUE} Result of evaluating f repeatedly across the values of<tr><td><a name="l338" href="#l338">338</a><td> * the iterator.<tr><td><a name="l339" href="#l339">339</a><td> * @template THIS, VALUE<tr><td><a name="l340" href="#l340">340</a><td> */<tr><td><a name="l341" href="#l341">341</a><td>goog.iter.reduce = function(iterable, f, val, opt_obj) {<tr><td><a name="l342" href="#l342">342</a><td> var rval = val;<tr><td><a name="l343" href="#l343">343</a><td> goog.iter.forEach(iterable, function(val) {<tr><td><a name="l344" href="#l344">344</a><td> rval = f.call(opt_obj, rval, val);<tr><td><a name="l345" href="#l345">345</a><td> });<tr><td><a name="l346" href="#l346">346</a><td> return rval;<tr><td><a name="l347" href="#l347">347</a><td>};<tr><td><a name="l348" href="#l348">348</a><td><tr><td><a name="l349" href="#l349">349</a><td><tr><td><a name="l350" href="#l350">350</a><td>/**<tr><td><a name="l351" href="#l351">351</a><td> * Goes through the values in the iterator. Calls f for each of these, and if<tr><td><a name="l352" href="#l352">352</a><td> * any of them returns true, this returns true (without checking the rest). If<tr><td><a name="l353" href="#l353">353</a><td> * all return false this will return false.<tr><td><a name="l354" href="#l354">354</a><td> *<tr><td><a name="l355" href="#l355">355</a><td> * @param {goog.iter.Iterator.<VALUE>|goog.iter.Iterable} iterable The iterator<tr><td><a name="l356" href="#l356">356</a><td> * object.<tr><td><a name="l357" href="#l357">357</a><td> * @param {<tr><td><a name="l358" href="#l358">358</a><td> * function(this:THIS,VALUE,undefined,goog.iter.Iterator.<VALUE>):boolean} f<tr><td><a name="l359" href="#l359">359</a><td> * The function to call for every value. This function takes 3 arguments<tr><td><a name="l360" href="#l360">360</a><td> * (the value, undefined, and the iterator) and should return a boolean.<tr><td><a name="l361" href="#l361">361</a><td> * @param {THIS=} opt_obj The object to be used as the value of 'this' within<tr><td><a name="l362" href="#l362">362</a><td> * {@code f}.<tr><td><a name="l363" href="#l363">363</a><td> * @return {boolean} true if any value passes the test.<tr><td><a name="l364" href="#l364">364</a><td> * @template THIS, VALUE<tr><td><a name="l365" href="#l365">365</a><td> */<tr><td><a name="l366" href="#l366">366</a><td>goog.iter.some = function(iterable, f, opt_obj) {<tr><td><a name="l367" href="#l367">367</a><td> iterable = goog.iter.toIterator(iterable);<tr><td><a name="l368" href="#l368">368</a><td> /** @preserveTry */<tr><td><a name="l369" href="#l369">369</a><td> try {<tr><td><a name="l370" href="#l370">370</a><td> while (true) {<tr><td><a name="l371" href="#l371">371</a><td> if (f.call(opt_obj, iterable.next(), undefined, iterable)) {<tr><td><a name="l372" href="#l372">372</a><td> return true;<tr><td><a name="l373" href="#l373">373</a><td> }<tr><td><a name="l374" href="#l374">374</a><td> }<tr><td><a name="l375" href="#l375">375</a><td> } catch (ex) {<tr><td><a name="l376" href="#l376">376</a><td> if (ex !== goog.iter.StopIteration) {<tr><td><a name="l377" href="#l377">377</a><td> throw ex;<tr><td><a name="l378" href="#l378">378</a><td> }<tr><td><a name="l379" href="#l379">379</a><td> }<tr><td><a name="l380" href="#l380">380</a><td> return false;<tr><td><a name="l381" href="#l381">381</a><td>};<tr><td><a name="l382" href="#l382">382</a><td><tr><td><a name="l383" href="#l383">383</a><td><tr><td><a name="l384" href="#l384">384</a><td>/**<tr><td><a name="l385" href="#l385">385</a><td> * Goes through the values in the iterator. Calls f for each of these and if any<tr><td><a name="l386" href="#l386">386</a><td> * of them returns false this returns false (without checking the rest). If all<tr><td><a name="l387" href="#l387">387</a><td> * return true this will return true.<tr><td><a name="l388" href="#l388">388</a><td> *<tr><td><a name="l389" href="#l389">389</a><td> * @param {goog.iter.Iterator.<VALUE>|goog.iter.Iterable} iterable The iterator<tr><td><a name="l390" href="#l390">390</a><td> * object.<tr><td><a name="l391" href="#l391">391</a><td> * @param {<tr><td><a name="l392" href="#l392">392</a><td> * function(this:THIS,VALUE,undefined,goog.iter.Iterator.<VALUE>):boolean} f<tr><td><a name="l393" href="#l393">393</a><td> * The function to call for every value. This function takes 3 arguments<tr><td><a name="l394" href="#l394">394</a><td> * (the value, undefined, and the iterator) and should return a boolean.<tr><td><a name="l395" href="#l395">395</a><td> * @param {THIS=} opt_obj The object to be used as the value of 'this' within<tr><td><a name="l396" href="#l396">396</a><td> * {@code f}.<tr><td><a name="l397" href="#l397">397</a><td> * @return {boolean} true if every value passes the test.<tr><td><a name="l398" href="#l398">398</a><td> * @template THIS, VALUE<tr><td><a name="l399" href="#l399">399</a><td> */<tr><td><a name="l400" href="#l400">400</a><td>goog.iter.every = function(iterable, f, opt_obj) {<tr><td><a name="l401" href="#l401">401</a><td> iterable = goog.iter.toIterator(iterable);<tr><td><a name="l402" href="#l402">402</a><td> /** @preserveTry */<tr><td><a name="l403" href="#l403">403</a><td> try {<tr><td><a name="l404" href="#l404">404</a><td> while (true) {<tr><td><a name="l405" href="#l405">405</a><td> if (!f.call(opt_obj, iterable.next(), undefined, iterable)) {<tr><td><a name="l406" href="#l406">406</a><td> return false;<tr><td><a name="l407" href="#l407">407</a><td> }<tr><td><a name="l408" href="#l408">408</a><td> }<tr><td><a name="l409" href="#l409">409</a><td> } catch (ex) {<tr><td><a name="l410" href="#l410">410</a><td> if (ex !== goog.iter.StopIteration) {<tr><td><a name="l411" href="#l411">411</a><td> throw ex;<tr><td><a name="l412" href="#l412">412</a><td> }<tr><td><a name="l413" href="#l413">413</a><td> }<tr><td><a name="l414" href="#l414">414</a><td> return true;<tr><td><a name="l415" href="#l415">415</a><td>};<tr><td><a name="l416" href="#l416">416</a><td><tr><td><a name="l417" href="#l417">417</a><td><tr><td><a name="l418" href="#l418">418</a><td>/**<tr><td><a name="l419" href="#l419">419</a><td> * Takes zero or more iterables and returns one iterator that will iterate over<tr><td><a name="l420" href="#l420">420</a><td> * them in the order chained.<tr><td><a name="l421" href="#l421">421</a><td> * @param {...!goog.iter.Iterator.<VALUE>|!goog.iter.Iterable} var_args Any<tr><td><a name="l422" href="#l422">422</a><td> * number of iterable objects.<tr><td><a name="l423" href="#l423">423</a><td> * @return {!goog.iter.Iterator.<VALUE>} Returns a new iterator that will<tr><td><a name="l424" href="#l424">424</a><td> * iterate over all the given iterables' contents.<tr><td><a name="l425" href="#l425">425</a><td> * @template VALUE<tr><td><a name="l426" href="#l426">426</a><td> */<tr><td><a name="l427" href="#l427">427</a><td>goog.iter.chain = function(var_args) {<tr><td><a name="l428" href="#l428">428</a><td> var iterator = goog.iter.toIterator(arguments);<tr><td><a name="l429" href="#l429">429</a><td> var iter = new goog.iter.Iterator();<tr><td><a name="l430" href="#l430">430</a><td> var current = null;<tr><td><a name="l431" href="#l431">431</a><td><tr><td><a name="l432" href="#l432">432</a><td> iter.next = function() {<tr><td><a name="l433" href="#l433">433</a><td> while (true) {<tr><td><a name="l434" href="#l434">434</a><td> if (current == null) {<tr><td><a name="l435" href="#l435">435</a><td> var it = iterator.next();<tr><td><a name="l436" href="#l436">436</a><td> current = goog.iter.toIterator(it);<tr><td><a name="l437" href="#l437">437</a><td> }<tr><td><a name="l438" href="#l438">438</a><td> try {<tr><td><a name="l439" href="#l439">439</a><td> return current.next();<tr><td><a name="l440" href="#l440">440</a><td> } catch (ex) {<tr><td><a name="l441" href="#l441">441</a><td> if (ex !== goog.iter.StopIteration) {<tr><td><a name="l442" href="#l442">442</a><td> throw ex;<tr><td><a name="l443" href="#l443">443</a><td> }<tr><td><a name="l444" href="#l444">444</a><td> current = null;<tr><td><a name="l445" href="#l445">445</a><td> }<tr><td><a name="l446" href="#l446">446</a><td> }<tr><td><a name="l447" href="#l447">447</a><td> };<tr><td><a name="l448" href="#l448">448</a><td><tr><td><a name="l449" href="#l449">449</a><td> return iter;<tr><td><a name="l450" href="#l450">450</a><td>};<tr><td><a name="l451" href="#l451">451</a><td><tr><td><a name="l452" href="#l452">452</a><td><tr><td><a name="l453" href="#l453">453</a><td>/**<tr><td><a name="l454" href="#l454">454</a><td> * Takes a single iterable containing zero or more iterables and returns one<tr><td><a name="l455" href="#l455">455</a><td> * iterator that will iterate over each one in the order given.<tr><td><a name="l456" href="#l456">456</a><td> * @see http://docs.python.org/2/library/itertools.html#itertools.chain.from_iterable<tr><td><a name="l457" href="#l457">457</a><td> * @param {goog.iter.Iterable} iterable The iterable of iterables to chain.<tr><td><a name="l458" href="#l458">458</a><td> * @return {!goog.iter.Iterator.<VALUE>} Returns a new iterator that will<tr><td><a name="l459" href="#l459">459</a><td> * iterate over all the contents of the iterables contained within<tr><td><a name="l460" href="#l460">460</a><td> * {@code iterable}.<tr><td><a name="l461" href="#l461">461</a><td> * @template VALUE<tr><td><a name="l462" href="#l462">462</a><td> */<tr><td><a name="l463" href="#l463">463</a><td>goog.iter.chainFromIterable = function(iterable) {<tr><td><a name="l464" href="#l464">464</a><td> return goog.iter.chain.apply(undefined, iterable);<tr><td><a name="l465" href="#l465">465</a><td>};<tr><td><a name="l466" href="#l466">466</a><td><tr><td><a name="l467" href="#l467">467</a><td><tr><td><a name="l468" href="#l468">468</a><td>/**<tr><td><a name="l469" href="#l469">469</a><td> * Builds a new iterator that iterates over the original, but skips elements as<tr><td><a name="l470" href="#l470">470</a><td> * long as a supplied function returns true.<tr><td><a name="l471" href="#l471">471</a><td> * @param {goog.iter.Iterator.<VALUE>|goog.iter.Iterable} iterable The iterator<tr><td><a name="l472" href="#l472">472</a><td> * object.<tr><td><a name="l473" href="#l473">473</a><td> * @param {<tr><td><a name="l474" href="#l474">474</a><td> * function(this:THIS,VALUE,undefined,goog.iter.Iterator.<VALUE>):boolean} f<tr><td><a name="l475" href="#l475">475</a><td> * The function to call for every value. This function takes 3 arguments<tr><td><a name="l476" href="#l476">476</a><td> * (the value, undefined, and the iterator) and should return a boolean.<tr><td><a name="l477" href="#l477">477</a><td> * @param {THIS=} opt_obj The object to be used as the value of 'this' within<tr><td><a name="l478" href="#l478">478</a><td> * {@code f}.<tr><td><a name="l479" href="#l479">479</a><td> * @return {!goog.iter.Iterator.<VALUE>} A new iterator that drops elements from<tr><td><a name="l480" href="#l480">480</a><td> * the original iterator as long as {@code f} is true.<tr><td><a name="l481" href="#l481">481</a><td> * @template THIS, VALUE<tr><td><a name="l482" href="#l482">482</a><td> */<tr><td><a name="l483" href="#l483">483</a><td>goog.iter.dropWhile = function(iterable, f, opt_obj) {<tr><td><a name="l484" href="#l484">484</a><td> var iterator = goog.iter.toIterator(iterable);<tr><td><a name="l485" href="#l485">485</a><td> var newIter = new goog.iter.Iterator;<tr><td><a name="l486" href="#l486">486</a><td> var dropping = true;<tr><td><a name="l487" href="#l487">487</a><td> newIter.next = function() {<tr><td><a name="l488" href="#l488">488</a><td> while (true) {<tr><td><a name="l489" href="#l489">489</a><td> var val = iterator.next();<tr><td><a name="l490" href="#l490">490</a><td> if (dropping && f.call(opt_obj, val, undefined, iterator)) {<tr><td><a name="l491" href="#l491">491</a><td> continue;<tr><td><a name="l492" href="#l492">492</a><td> } else {<tr><td><a name="l493" href="#l493">493</a><td> dropping = false;<tr><td><a name="l494" href="#l494">494</a><td> }<tr><td><a name="l495" href="#l495">495</a><td> return val;<tr><td><a name="l496" href="#l496">496</a><td> }<tr><td><a name="l497" href="#l497">497</a><td> };<tr><td><a name="l498" href="#l498">498</a><td> return newIter;<tr><td><a name="l499" href="#l499">499</a><td>};<tr><td><a name="l500" href="#l500">500</a><td><tr><td><a name="l501" href="#l501">501</a><td><tr><td><a name="l502" href="#l502">502</a><td>/**<tr><td><a name="l503" href="#l503">503</a><td> * Builds a new iterator that iterates over the original, but only as long as a<tr><td><a name="l504" href="#l504">504</a><td> * supplied function returns true.<tr><td><a name="l505" href="#l505">505</a><td> * @param {goog.iter.Iterator.<VALUE>|goog.iter.Iterable} iterable The iterator<tr><td><a name="l506" href="#l506">506</a><td> * object.<tr><td><a name="l507" href="#l507">507</a><td> * @param {<tr><td><a name="l508" href="#l508">508</a><td> * function(this:THIS,VALUE,undefined,goog.iter.Iterator.<VALUE>):boolean} f<tr><td><a name="l509" href="#l509">509</a><td> * The function to call for every value. This function takes 3 arguments<tr><td><a name="l510" href="#l510">510</a><td> * (the value, undefined, and the iterator) and should return a boolean.<tr><td><a name="l511" href="#l511">511</a><td> * @param {THIS=} opt_obj This is used as the 'this' object in f when called.<tr><td><a name="l512" href="#l512">512</a><td> * @return {!goog.iter.Iterator.<VALUE>} A new iterator that keeps elements in<tr><td><a name="l513" href="#l513">513</a><td> * the original iterator as long as the function is true.<tr><td><a name="l514" href="#l514">514</a><td> * @template THIS, VALUE<tr><td><a name="l515" href="#l515">515</a><td> */<tr><td><a name="l516" href="#l516">516</a><td>goog.iter.takeWhile = function(iterable, f, opt_obj) {<tr><td><a name="l517" href="#l517">517</a><td> var iterator = goog.iter.toIterator(iterable);<tr><td><a name="l518" href="#l518">518</a><td> var newIter = new goog.iter.Iterator;<tr><td><a name="l519" href="#l519">519</a><td> var taking = true;<tr><td><a name="l520" href="#l520">520</a><td> newIter.next = function() {<tr><td><a name="l521" href="#l521">521</a><td> while (true) {<tr><td><a name="l522" href="#l522">522</a><td> if (taking) {<tr><td><a name="l523" href="#l523">523</a><td> var val = iterator.next();<tr><td><a name="l524" href="#l524">524</a><td> if (f.call(opt_obj, val, undefined, iterator)) {<tr><td><a name="l525" href="#l525">525</a><td> return val;<tr><td><a name="l526" href="#l526">526</a><td> } else {<tr><td><a name="l527" href="#l527">527</a><td> taking = false;<tr><td><a name="l528" href="#l528">528</a><td> }<tr><td><a name="l529" href="#l529">529</a><td> } else {<tr><td><a name="l530" href="#l530">530</a><td> throw goog.iter.StopIteration;<tr><td><a name="l531" href="#l531">531</a><td> }<tr><td><a name="l532" href="#l532">532</a><td> }<tr><td><a name="l533" href="#l533">533</a><td> };<tr><td><a name="l534" href="#l534">534</a><td> return newIter;<tr><td><a name="l535" href="#l535">535</a><td>};<tr><td><a name="l536" href="#l536">536</a><td><tr><td><a name="l537" href="#l537">537</a><td><tr><td><a name="l538" href="#l538">538</a><td>/**<tr><td><a name="l539" href="#l539">539</a><td> * Converts the iterator to an array<tr><td><a name="l540" href="#l540">540</a><td> * @param {goog.iter.Iterator.<VALUE>|goog.iter.Iterable} iterable The iterator<tr><td><a name="l541" href="#l541">541</a><td> * to convert to an array.<tr><td><a name="l542" href="#l542">542</a><td> * @return {!Array.<VALUE>} An array of the elements the iterator iterates over.<tr><td><a name="l543" href="#l543">543</a><td> * @template VALUE<tr><td><a name="l544" href="#l544">544</a><td> */<tr><td><a name="l545" href="#l545">545</a><td>goog.iter.toArray = function(iterable) {<tr><td><a name="l546" href="#l546">546</a><td> // Fast path for array-like.<tr><td><a name="l547" href="#l547">547</a><td> if (goog.isArrayLike(iterable)) {<tr><td><a name="l548" href="#l548">548</a><td> return goog.array.toArray(/** @type {!goog.array.ArrayLike} */(iterable));<tr><td><a name="l549" href="#l549">549</a><td> }<tr><td><a name="l550" href="#l550">550</a><td> iterable = goog.iter.toIterator(iterable);<tr><td><a name="l551" href="#l551">551</a><td> var array = [];<tr><td><a name="l552" href="#l552">552</a><td> goog.iter.forEach(iterable, function(val) {<tr><td><a name="l553" href="#l553">553</a><td> array.push(val);<tr><td><a name="l554" href="#l554">554</a><td> });<tr><td><a name="l555" href="#l555">555</a><td> return array;<tr><td><a name="l556" href="#l556">556</a><td>};<tr><td><a name="l557" href="#l557">557</a><td><tr><td><a name="l558" href="#l558">558</a><td><tr><td><a name="l559" href="#l559">559</a><td>/**<tr><td><a name="l560" href="#l560">560</a><td> * Iterates over two iterables and returns true if they contain the same<tr><td><a name="l561" href="#l561">561</a><td> * sequence of elements and have the same length.<tr><td><a name="l562" href="#l562">562</a><td> * @param {!goog.iter.Iterator.<VALUE>|!goog.iter.Iterable} iterable1 The first<tr><td><a name="l563" href="#l563">563</a><td> * iterable object.<tr><td><a name="l564" href="#l564">564</a><td> * @param {!goog.iter.Iterator.<VALUE>|!goog.iter.Iterable} iterable2 The second<tr><td><a name="l565" href="#l565">565</a><td> * iterable object.<tr><td><a name="l566" href="#l566">566</a><td> * @return {boolean} true if the iterables contain the same sequence of elements<tr><td><a name="l567" href="#l567">567</a><td> * and have the same length.<tr><td><a name="l568" href="#l568">568</a><td> * @template VALUE<tr><td><a name="l569" href="#l569">569</a><td> */<tr><td><a name="l570" href="#l570">570</a><td>goog.iter.equals = function(iterable1, iterable2) {<tr><td><a name="l571" href="#l571">571</a><td> var fillValue = {};<tr><td><a name="l572" href="#l572">572</a><td> var pairs = goog.iter.zipLongest(fillValue, iterable1, iterable2);<tr><td><a name="l573" href="#l573">573</a><td> return goog.iter.every(pairs, function(pair) {<tr><td><a name="l574" href="#l574">574</a><td> return pair[0] == pair[1];<tr><td><a name="l575" href="#l575">575</a><td> });<tr><td><a name="l576" href="#l576">576</a><td>};<tr><td><a name="l577" href="#l577">577</a><td><tr><td><a name="l578" href="#l578">578</a><td><tr><td><a name="l579" href="#l579">579</a><td>/**<tr><td><a name="l580" href="#l580">580</a><td> * Advances the iterator to the next position, returning the given default value<tr><td><a name="l581" href="#l581">581</a><td> * instead of throwing an exception if the iterator has no more entries.<tr><td><a name="l582" href="#l582">582</a><td> * @param {goog.iter.Iterator.<VALUE>|goog.iter.Iterable} iterable The iterable<tr><td><a name="l583" href="#l583">583</a><td> * object.<tr><td><a name="l584" href="#l584">584</a><td> * @param {VALUE} defaultValue The value to return if the iterator is empty.<tr><td><a name="l585" href="#l585">585</a><td> * @return {VALUE} The next item in the iteration, or defaultValue if the<tr><td><a name="l586" href="#l586">586</a><td> * iterator was empty.<tr><td><a name="l587" href="#l587">587</a><td> * @template VALUE<tr><td><a name="l588" href="#l588">588</a><td> */<tr><td><a name="l589" href="#l589">589</a><td>goog.iter.nextOrValue = function(iterable, defaultValue) {<tr><td><a name="l590" href="#l590">590</a><td> try {<tr><td><a name="l591" href="#l591">591</a><td> return goog.iter.toIterator(iterable).next();<tr><td><a name="l592" href="#l592">592</a><td> } catch (e) {<tr><td><a name="l593" href="#l593">593</a><td> if (e != goog.iter.StopIteration) {<tr><td><a name="l594" href="#l594">594</a><td> throw e;<tr><td><a name="l595" href="#l595">595</a><td> }<tr><td><a name="l596" href="#l596">596</a><td> return defaultValue;<tr><td><a name="l597" href="#l597">597</a><td> }<tr><td><a name="l598" href="#l598">598</a><td>};<tr><td><a name="l599" href="#l599">599</a><td><tr><td><a name="l600" href="#l600">600</a><td><tr><td><a name="l601" href="#l601">601</a><td>/**<tr><td><a name="l602" href="#l602">602</a><td> * Cartesian product of zero or more sets. Gives an iterator that gives every<tr><td><a name="l603" href="#l603">603</a><td> * combination of one element chosen from each set. For example,<tr><td><a name="l604" href="#l604">604</a><td> * ([1, 2], [3, 4]) gives ([1, 3], [1, 4], [2, 3], [2, 4]).<tr><td><a name="l605" href="#l605">605</a><td> * @see http://docs.python.org/library/itertools.html#itertools.product<tr><td><a name="l606" href="#l606">606</a><td> * @param {...!goog.array.ArrayLike.<VALUE>} var_args Zero or more sets, as<tr><td><a name="l607" href="#l607">607</a><td> * arrays.<tr><td><a name="l608" href="#l608">608</a><td> * @return {!goog.iter.Iterator.<!Array.<VALUE>>} An iterator that gives each<tr><td><a name="l609" href="#l609">609</a><td> * n-tuple (as an array).<tr><td><a name="l610" href="#l610">610</a><td> * @template VALUE<tr><td><a name="l611" href="#l611">611</a><td> */<tr><td><a name="l612" href="#l612">612</a><td>goog.iter.product = function(var_args) {<tr><td><a name="l613" href="#l613">613</a><td> var someArrayEmpty = goog.array.some(arguments, function(arr) {<tr><td><a name="l614" href="#l614">614</a><td> return !arr.length;<tr><td><a name="l615" href="#l615">615</a><td> });<tr><td><a name="l616" href="#l616">616</a><td><tr><td><a name="l617" href="#l617">617</a><td> // An empty set in a cartesian product gives an empty set.<tr><td><a name="l618" href="#l618">618</a><td> if (someArrayEmpty || !arguments.length) {<tr><td><a name="l619" href="#l619">619</a><td> return new goog.iter.Iterator();<tr><td><a name="l620" href="#l620">620</a><td> }<tr><td><a name="l621" href="#l621">621</a><td><tr><td><a name="l622" href="#l622">622</a><td> var iter = new goog.iter.Iterator();<tr><td><a name="l623" href="#l623">623</a><td> var arrays = arguments;<tr><td><a name="l624" href="#l624">624</a><td><tr><td><a name="l625" href="#l625">625</a><td> // The first indices ar