Trying to add each element of array to the next one for unknown number of elements

Question

Something like this but generalized

let arr = [6, 5, 4, 3];
let i = 0, j = 0;
let result = [];

    result.push(arr[0]+arr[1],
arr[2]+arr[3]);

console.log(result

Answer 1

Ignoring last element if array has odd number of elements:

 function f(arr) { let result = []; for (let i=0; i<arr.length; i++) { if (i % 2==0 && i<arr.length-1) { result.push(arr[i] + arr[i+1]); i++; } }; return result; } let arr = [6, 5, 4, 3]; console.log(f(arr)); console.log(f([1, 2, 3, 4, 5, 6, 7]));