Commit 0432dc0

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Swastikyadav

committed

Add polyfill for map, filter, and reduce array methods

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	`1`	`+// Polyfill of Array.prototype.map method`
	`2`	`+Array.prototype.myMap = function (callback) {`
	`3`	`+ const resultArr = [];`
	`4`	`+`
	`5`	`+ for(let i = 0; i < this.length; i++) {`
	`6`	`+ resultArr.push(callback(this[i], i, this));`
	`7`	`+ }`
	`8`	`+`
	`9`	`+ return resultArr;`
	`10`	`+};`
	`11`	`+`
	`12`	`+// Polyfill of Array.prototype.filter method`
	`13`	`+Array.prototype.myFilter = function (callback) {`
	`14`	`+ const resultArr = [];`
	`15`	`+`
	`16`	`+ for(let i = 0; i < this.length; i++) {`
	`17`	`+ const bool = callback(this[i], i, this);`
	`18`	`+ bool === true && resultArr.push(this[i]);`
	`19`	`+ }`
	`20`	`+`
	`21`	`+ return resultArr;`
	`22`	`+};`
	`23`	`+`
	`24`	`+// Polyfill of Array.prototype.reduce method`
	`25`	`+Array.prototype.myReduce = function (callback, initialValue) {`
	`26`	`+ let acc = initialValue;`
	`27`	`+ for(let i = 0; i < this.length; i++) {`
	`28`	`+ if (i === 0 && initialValue === undefined) {`
	`29`	`+ acc = this[i];`
	`30`	`+ } else {`
	`31`	`+ acc = callback(acc, this[i], i, this);`
	`32`	`+ }`
	`33`	`+ }`
	`34`	`+`
	`35`	`+ return acc;`
	`36`	`+};`

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