js

Custom own Map function into javascript

/**

• Write a custom map function into javascript with example */

Array.prototype.myMap = function(callback) { let newArray = []; let x = this.length; for (let i = 0; i < x; i++) { let counter = callback(this[i]); newArray.push(counter); } return newArray; };

let arr = [1, 2, 3]; arr = arr.myMap(e => e * 2); console.log(arr);

Array.prototype.myOwnMap = function(callback) {

let newArray = [];

/**
 * let len = this.length;
for(let i = 0; i < len; i++){
    let temp = callback(this[i]);
    newArray.push(temp);
}


for(let ele =of this){
    let temp = callback(ele);
    newArray.push(temp);
}


 this.forEach((item)=> {
    let newT = callback(item);
    newArray.push(newT);
    
});

**/

for(let ele of this){ let temp = callback(ele); newArray.push(temp); } return newArray; }

var arrr = [11, 2, 3].myOwnMap(e => e * 2); console.log(arrr);