How to get an array from number positions of other array?

Question

I have an array A = [1,3] - which stores positions of correct answers from another array B = ["answer1","answer2","answer3","answer4"]. I need to get an array C which will be consist from the correct answers, something like this ["answer1","answer3"].

Example: If array A consist from 1 element (for example A = [2]), then array C should look like C = ["answer2"].

I can solve this problem with indexOf(), when I have an array A consisting from 1 element. But when there are 2 or more elements I'm getting stuck

An alternative solution to @Ilia Komarov's perfect one can be: for (var i in A) C += B[A[i]-1] Just to know. — AbsoluteBeginner
– AbsoluteBeginner, Commented Mar 20, 2021 at 9:45

Ilia Komarov · Accepted Answer · 2021-03-20 07:03:03Z

5

You should do something like:

let A = [1,3];
let B = ["answer1","answer2","answer3","answer4"];
let C = A.map(i => B[i-1]);

answered Mar 20, 2021 at 7:03

Ilia Komarov

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