for.js

const arr = [1, 4, 4, 54, 56, 54, 2, 23, 6, 54, 65, 65];
const reduceSum = arr => arr.reduce((acc, val) => acc + val);
const forEachSum = arr => {
   let sum = 0;
   arr.forEach(el => sum += el);
   return sum;
};
const forSum = arr => {
  let sum = 0;
  for (let i = 0; i < arr.length; i++ ) sum += arr[i];
  return sum;
}
const forOfSum = arr => {
  let sum = 0;
  for (const i of arr) sum += i;
  return sum;
}
const iterations = 1000000000;

console.time('reduce');
for(let i = 0; i < iterations; i++){
   let sumReduce = reduceSum(arr);
};
console.timeEnd('reduce');

console.time('forEach');
for(let j = 0; j < iterations; j++){
   let sumForEach = forEachSum(arr);
};
console.timeEnd('forEach');

console.time('forSum');
for(let k = 0; k < iterations; k++){
   let sumForEach = forSum(arr);
};
console.timeEnd('forSum');

console.time('forOfSum');
for(let j = 0; j < iterations; j++){
   let sumForEach = forOfSum(arr);
};
console.timeEnd('forOfSum');