polyfill for map and filter method in javascript

working link==>https://stackblitz.com/edit/js-wpw67a

//check out filter map and reduce once

//create your own map function or polyfill for map

//map callback accept three parameter one value second index and third one is a current array

//create a polyfill for map function

Array.prototype.myMap=function(callBack)

{

if(typeof callBack != "function")

{

throw new TypeError();

}

var newArray=[];

for(var i=0;i<this.length;i++)

{

//this is current Array

//i is index

//this[i] is current item

newArray.push(callBack.apply(null,[this[i],i,this]));

}

return newArray;

}

var myArray=[1,2,3,4,5];

var newArray=myArray.myMap((value,index)=>{

return value*index;

})

console.log(newArray);

//now polyfill for filter which accept three parameter one value second index and third one is a current array

Array.prototype.myFilter=function(callBack)

{

if(typeof callBack != "function")

{

throw new TypeError();

}

var newArray=[];

for(var i=0;i<this.length;i++)

{

if(callBack.apply(null,[this[i],i,this]))

{

newArray.push(this[i]);

}

}

return newArray;

}

//example first-----------------------------

var myArray1=[1,2,3,4,5];

var newArray1=myArray1.myFilter((value,index)=>{

return value>2;

})

console.log(newArray1);

//let other example

var strs=["manish","deep","seema","ok","opps"];

//return only names which contain 5 or more letter

var newNames=strs.myFilter((value)=>{

return value.length>=5;

})