const original_Arr=[1,2,3];
Array.prototype.myMap=function(cb){
let argArr=this;
let output_Arr=[];
for(let i=0;i<argArr.length;i++){
const value=cb(argArr[i],i,argArr);
output_Arr.push(value);
}
return output_Arr;
}
const new_Arr=original_Arr.myMap((element,index,arr)=>{
return element*2;
});
console.log(newArr); //[2,4,6]
In the above method we used array prototype(i.e.,
Array.prototype.myMap()) to create a customArray.map()method.As shown above
thisrefer to the actual array on which we are running themyMap(). Here,thisrefers tooriginal_Arr[].
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