Can anyone please help explain the science behind the output of this code?

Question

function add(arr) {
var a = arr.reduce(function(p, c) {
return p + c;
})
return a;
}
function multiply(arr, func) {
var doubles = arr.map(function(n) {
return n * n;
});
return func(doubles);
}
var m = multiply([1,2,3,4], add);
console.log(m); // output 30

Answer 1

The output is 30.

The multiply function returns an array where each element is squared: [1,4,9,16].

The add function returns the sum of all array elements: 1+4+9+16 = 30.

Answer 2

Oh, thank you ~ swim ~

Answer 3

I wish you were correct Michael but your answer is not what SoloLearn gave as answer in the challenges section

Answer 4

https://code.sololearn.com/W0FbxCsUIE3h/?ref=app

Answer 5

Alright, thanks Michael and ~ swim ~

Answer 6

Honestly, ~ swim ~, SoloLearn are meant to make you a platinum Moderator

Answer 7

Your level of knowledge ~ swim ~

Answer 8

Michael and ~ swim ~, you can review this question here to see if I'm wrong or SoloLearn

https://www.sololearn.com/post/137749/?ref=app