array of prefix sums of the given array. JavaScript,

Question

This question already has answers here: question from:https://stackoverflow.com/questions/65647974/array-of-prefix-sums-of-the-given-array-javascript

Answer 1

Map

Basic solution map to create a new result Array and inside of map use a loop to build the sum.

    let arr = [1, 2, 3, 4, 5]

    const result = arr.map((val, index) => {
    let sum = 0;
    
    for(let i = 0; i < index+1 ; i++){
    sum += arr[i];
    }
    return sum;
    });

    console.log(result);