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an elegant efficient express mvvm framework
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<a href="../index.html">all files</a> / <a href="index.html">filters/</a> array.js
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">import { avalon } from '../seed/core'
/*
https://github.com/hufyhang/orderBy/blob/master/index.js
*/
export function orderBy(array, by, decend) {
var type = avalon.type(array)
if (type !== 'array' && type !== 'object')
throw 'orderBy只能处理对象或数组'
var criteria = typeof by == 'string' ? function (el) {
return el && el[by]
} : typeof by === 'function' ? by : function (el) {
return el
}
var mapping = {}
var temp = []
var index = 0
for (var key in array) {
<span class="missing-if-branch" title="else path not taken" >E</span>if (array.hasOwnProperty(key)) {
var val = array[key]
var k = criteria(val, key)
if (k in mapping) {
mapping[k].push(key)
} else {
mapping[k] = [key]
}
temp.push(k)
}
}
temp.sort()
if (decend < 0) {
temp.reverse()
}
var _array = type === 'array'
var target = _array ? [] : {}
return recovery(target, temp, function (k) {
var key = mapping[k].shift()
if (_array) {
target.push(array[key])
} else {
target[key] = array[key]
}
})
}
export function filterBy(array, search) {
var type = avalon.type(array)
if (type !== 'array' && type !== 'object')
throw 'filterBy只能处理对象或数组'
var args = avalon.slice(arguments, 2)
var stype = avalon.type(search)
if (stype === 'function') {
var criteria = search
} else if (stype === 'string' || stype === 'number') {
if (search === '') {
return array
} else {
var reg = new RegExp(avalon.escapeRegExp(search), 'i')
criteria = function (el) {
return reg.test(el)
}
}
} else {
return array
}
array = convertArray(array).filter(function (el, i) {
return !!criteria.apply(el, [el.value, i].concat(args))
})
var isArray = type === 'array'
var target = isArray ? [] : {}
return recovery(target, array, function (el) {
if (isArray) {
target.push(el.value)
} else {
target[el.key] = el.value
}
})
}
export function selectBy(data, array, defaults) {
if (avalon.isObject(data) && !Array.isArray(data)) {
var target = []
return recovery(target, array, function (name) {
target.push(data.hasOwnProperty(name) ? data[name] : defaults ? defaults[name] : <span class="branch-1 cbranch-no" title="branch not covered" >'')</span>
})
} else {
return data
}
}
export function limitBy(input, limit, begin) {
var type = avalon.type(input)
if (type !== 'array' && type !== 'object')
throw 'limitBy只能处理对象或数组'
//必须是数值
if (typeof limit !== 'number') {
return input
}
//不能为NaN
if (limit !== limit) {
return input
}
//将目标转换为数组
if (type === 'object') {
input = convertArray(input)
}
var n = input.length
limit = Math.floor(Math.min(n, limit))
begin = typeof begin === 'number' ? begin : 0
if (begin < 0) {
begin = Math.max(0, n + begin)
}
var data = []
for (var i = begin; i < n; i++) {
if (data.length === limit) {
break
}
data.push(input[i])
}
var isArray = type === 'array'
if (isArray) {
return data
}
var target = {}
return recovery(target, data, function (el) {
target[el.key] = el.value
})
}
function recovery(ret, array, callback) {
for (var i = 0, n = array.length; i < n; i++) {
callback(array[i])
}
return ret
}
//Chrome谷歌浏览器中js代码Array.sort排序的bug乱序解决办法
//http://www.cnblogs.com/yzeng/p/3949182.html
function convertArray(array) {
var ret = [], i = 0
for (var key in array) {
<span class="missing-if-branch" title="else path not taken" >E</span>if (array.hasOwnProperty(key)) {
ret[i] = {
oldIndex: i,
value: array[key],
key: key
}
i++
}
}
return ret
}
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