JAVASCRIPT

array sum javascript

const arr = [1, 2, 3, 4];
const sum = arr.reduce((a, b) => a + b, 0);
// sum = 10

es6 array sum javascript

const arrSum = arr.reduce((a,b) => a + b, 0);

js array elements sum

[1, 2, 3, 4].reduce((a, b) => a + b, 0)