@moyal/js-linq/dist/moyal.linq.min.mjs

A lightweight, zero-dependency JavaScript library that brings LINQ-style querying capabilities to native arrays. Designed for both clarity and performance, it offers a fluent, chainable API for filtering, projecting, grouping, ordering, and aggregating da

/*!
 * @moyal/js-linq v1.0.4
 * (c) 2000–present Ilan Moyal
 * Released under the MIT License
 */
class e{static#e=Object.freeze({ALL_MUST_BE_ITERABLE:"All arguments must be iterable",ARGUMENT_MUST_NOT_BE_NULL_key:"key argument MUST NOT be null",INPUT_SEQUENCE_CONTAINS_MORE_THAN_ONE_ELEMENT:"The input sequence contains more than one element",MORE_THAN_ELEMENT_SEQUENCE_SATISFIES_THE_CONDITION:"More than one element satisfies the condition in predicate",MUST_BE_NON_NEGATIVE_INTEGER_count:"count must be a non negative integer",MUST_BE_NON_NEGATIVE_INTEGER_factor:"`factor` must be a non negative integer",MUST_BE_NON_NEGATIVE_INTEGER_index:"index must be a non negative integer",MUST_BE_FUNCTION_OR_NULLISH_collectionSelector:"collectionSelector must be a function or nullish",MUST_BE_FUNCTION_OR_NULLISH_comparer:"comparer must be a function or nullish",MUST_BE_FUNCTION_OR_NULLISH_elementSelector:"elementSelector must be a function or nullish",MUST_BE_FUNCTION_OR_NULLISH_equalityComparer:"equalityComparer must be a function or nullish",MUST_BE_FUNCTION_OR_NULLISH_keyEqualityComparer:"keyEqualityComparer must be a function or nullish",MUST_BE_FUNCTION_OR_NULLISH_keySelector:"keySelector must be a function or nullish",MUST_BE_FUNCTION_OR_NULLISH_leftKeySelector:"leftKeySelector must be a function or nullish",MUST_BE_FUNCTION_OR_NULLISH_predicate:"predicate must be a function or nullish",MUST_BE_FUNCTION_OR_NULLISH_resultSelector:"resultSelector must be a function or nullish",MUST_BE_FUNCTION_OR_NULLISH_rightKeySelector:"rightKeySelector must be a function or nullish",MUST_BE_FUNCTION_OR_NULLISH_selector:"selector must be a function or nullish",MUST_BE_FUNCTION_OR_NULLISH_valueSelector:"valueSelector must be a function or nullish",MUST_BE_FUNCTION_accumulator:"accumulator must be a function",MUST_BE_FUNCTION_callback:"callback must be a function",MUST_BE_FUNCTION_predicate:"predicate must be a function",MUST_BE_FUNCTION_transform:"transform must be a function",MUST_BE_INTEGER_count:"count must be an integer",MUST_BE_INTEGER_start:"start must be an integer",MUST_BE_ITERABLE_iterable:"'iterable' argument must be iterable",MUST_BE_ITERABLE_iterable1:"iterable1 must be iterable",MUST_BE_ITERABLE_iterable2:"iterable2 must be iterable",MUST_BE_ITERABLE_rightIterable:"rightIterable must be iterable",MUST_BE_ITERABLE_secondIterable:"secondIterable must be iterable",MUST_BE_NUMBER_all_sequence_elements:"At least one of the sequence's element is not a number",NO_ELEMENT_SATISFIES_THE_CONDITION_IN_predicate:"No element satisfies the condition in predicate",OUT_OF_RANGE_index:"index is out of range",PRODUCES_DUPLICATE_KEYS_keySelector:"keySelector produces duplicate keys",SEQUENCE_IS_EMPTY:"The sequence is empty"});static get Messages(){return this.#e}}class t{static isNumber(e){return"number"==typeof e||"[object Number]"===Object.prototype.toString.call(e)}static isBigInt(e){return"bigint"==typeof e||"[object BigInt]"===Object.prototype.toString.call(e)}static 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0,range:void 0,mode:void 0,median:void 0,variance:void 0,standardDeviation:void 0},_=!0===s||s?.median?[]:null,o=!0===s||s?.mode?new Map:null;let l=0,u=0,h=0,c=0;for(let r of i){if(!t.isNumber(r))throw new Error(e.Messages.MUST_BE_NUMBER_all_sequence_elements);0===c?(n.minimum=r,n.maximum=r):(n.minimum=Math.min(n.minimum,r),n.maximum=Math.max(n.maximum,r)),n.summary+=r;const i=r-u;if(u+=i/(c+1),h+=i*(r-u),_&&_.push(r),o){let e=o.get(r)||0;e++,o.set(r,e),(0==l||e>l)&&(l=e)}c++}if(n.count=c,n.count>0){if(n.average=n.summary/n.count,n.range=n.maximum-n.minimum,n.count>1?(n.variance=h/n.count,n.standardDeviation=Math.sqrt(n.variance)):(n.variance=0,n.standardDeviation=0),_){_.sort(((e,t)=>e-t));const e=Math.floor(_.length/2);n.median=_.length%2!=0?_[e]:(_[e-1]+_[e])/2}if(o)if(l<=1)n.mode=void 0;else{const e=[];let t=0;for(const[r,i]of o.entries())t++,i===l&&e.push(r);e.length===t?n.mode=void 0:n.mode=e.sort(((e,t)=>e-t))}}return a.Statistics.fromJSON(n)}sum(){return a.#Ne(this.#S,this)}static#Ne(e,r){let i,s=0;for(let e of r){if(!t.isNumber(e))return;i=s+=e}return i}take(e){return a.#de(this.#S,this,e)}static#de(r,i,s){if(!t.isIntegral(s))throw new Error(e.Messages.MUST_BE_INTEGER_count);return new this(this.#ge(r,i,s),r)}static*#ge(e,t,r){let i=0;for(let e of t){if(!(i++<r))break;yield e}}takeLast(e){return a.#Se(this.#S,this,e)}static#Se(r,i,s){if(!t.isIntegral(s))throw new Error(e.Messages.MUST_BE_INTEGER_count);return new this(this.#Te(r,i,s),r)}static*#Te(e,t,r){if(r>0){let e=Array.from(t);for(let t=Math.max(0,e.length-r);t<e.length;t++)yield e[t]}}takeWhile(e){return a.#Ue(this.#S,this,e)}static#Ue(r,i,s){if(!t.isFunction(s))throw new Error(e.Messages.MUST_BE_FUNCTION_predicate);return new this(this.#Me(r,i,s),r)}static*#Me(e,t,r){let i=0;e=e??this;for(let s of t){if(!0!==r.call(e,s,i))break;yield s,i++}}toArray(){return a.#Ie(this.#S,this)}static#Ie(e,t){let r=[];for(let e of t)r.push(e);return r}toMap(e,t){return a.#we(this.#S,this,e,t,!1)}toDictionary(e,t){return a.#we(this.#S,this,e,t,!1)}toSet(e){return a.#we(this.#S,this,e,null,!0)}static#we(r,i,s,n,a,_){if(null!=s&&!t.isFunction(s))throw new Error(e.Messages.MUST_BE_FUNCTION_OR_NULLISH_keySelector);if(null!=n&&!t.isFunction(n))throw new Error(e.Messages.MUST_BE_FUNCTION_OR_NULLISH_valueSelector);s=s??this.#m,n=n??this.#m;let o=!0===a?new Set:new Map,l=0;r=r??this;for(let t of i){let i=s.call(r,t,l);if(o.has(i))throw new Error(e.Messages.PRODUCES_DUPLICATE_KEYS_keySelector);!0===a?o.add(i):o.set(i,n.call(r,t,l)),l++}return o}where(e){return a.#pe(this.#S,this,e)}static#pe(r,i,s){if(!t.isFunction(s))throw new Error(e.Messages.MUST_BE_FUNCTION_predicate);return new this(this.#ye(r,i,s),r)}static*#ye(e,t,r){let i=0;e=e??this;for(let s of t)!0===r.call(e,s,i)&&(yield s),i++}union(e,t){return a.#R(this.#S,this,e,t,"union")}static zip(r,i,s,n){if(!t.isIterable(r))throw new Error(e.Messages.MUST_BE_ITERABLE_iterable1);if(!t.isIterable(i))throw new Error(e.Messages.MUST_BE_ITERABLE_iterable2);if(!t.isFunction(s))throw new Error(e.Messages.MUST_BE_FUNCTION_transform);return new this(this.#Oe(n,r,i,s),n)}static*#Oe(e,t,r,i){let s,n,a=this.#d(t),_=this.#d(r),o=0;for(e=e??this,s=a.next(),n=_.next();!s.done&&!n.done;)yield i.call(e,s.value,n.value,o),s=a.next(),n=_.next(),o++;a.return(),_.return()}}a.Statistics=i;class _ extends a{static#E=(e,t)=>e>t?1:e<t?-1:0;#S=null;#g=null;#Le=[];constructor(r,i,s,n,a){if(super(r,a),null!=i&&!t.isFunction(i))throw new Error(e.Messages.MUST_BE_FUNCTION_OR_NULLISH_keySelector);if(null!=s&&!t.isFunction(s))throw new Error(e.Messages.MUST_BE_FUNCTION_OR_NULLISH_comparer);this.#g=r,this.#S=a,this.#Le=[_.#Be(i,s,n?-1:1)]}static#be(r,i,s,n){if(null!=i&&!t.isFunction(i))throw new Error(e.Messages.MUST_BE_FUNCTION_OR_NULLISH_keySelector);if(null!=s&&!t.isFunction(s))throw new Error(e.Messages.MUST_BE_FUNCTION_OR_NULLISH_comparer);return r.#Le.push(this.#Be(i,s,n?-1:1)),r}static#Be(e,t,r){return t=t??this.#E,null==e?function(e,i){return r*t(e,i)}:function(i,s){return r*t(e(i),e(s))}}#ve(e,t){return function(r,i){for(const s of t){const t=s.call(e,r,i);if(0!=t)return t}return 0}}*[Symbol.iterator](){yield*Array.from(this.#g).sort(this.#ve(this.#S??this,this.#Le))}thenBy(e,t){return _.#be(this,e,t,!1)}thenByDescending(e,t){return _.#be(this,e,t,!0)}}a.__setup(_,class extends a{#Ae=null;constructor(t,r,i){if(null==t)throw new Error(e.Messages.ARGUMENT_MUST_NOT_BE_NULL_key);super(r,i),this.#Ae=t}get key(){return this.#Ae}toString(){return`LinqGroup (key=${this.#Ae})`}});export{a as Linq,i as Statistics};