What is mapping in JS

Question

I am having difficulties understanding map() in js

Answer 1

Okay, so map() method is used to map over the array and return something for each element in it.

for example

let arr = [1,2,3,4,5];
console.log(arr);
arr = arr.map((val) => val + 1);
console.log(arr);

Answer 2

Yes, map function takes a callback function as argument with takes value which is equal to element each iteration

So 1 will be added to each of element like 1 becomes 2 and 2 is 3.

Answer 3

While Rick's answer is good, please let me provide more context :

https://code.sololearn.com/WwyR3SGoozeD/?ref=app

Firstly, map does not change the original array. It returns a new array.

Secondly, the callback can be explicitly declared and with function keyword.

Thirdly, the callback can take up to 3 arguments, namely item, index and the array itself.

Answer 4

Are you talking about Array method map()?

Answer 5

yes sir

Answer 6

Thanks sir, buh i am still a kindda confuse here. according to the code you wrote, 1 will be added to all the elements in the array?