Simple Array Sum (HackerRank)

simple-array-sum.js

// Without Reduce
function simpleArraySum(ar) {
    let total = 0;
    for(let elem in ar) {
        total += ar[elem]
    }
    return total;
}

// With Reduce
function simpleArraySum(ar) {
    return ar.reduce(function(acc, current) {
      return acc + current
    }, 0)
}

// With Reduce and Arrow Function
function simpleArraySum(ar) {
    return ar.reduce((acc, current) => acc + current, 0)
}