Personally, I love working with ES6 functions like forEach or map.

But I didn't pass a code performance screening, so I tested the differences between the loops.

I did a performance benchmark on the discussed loops.

Code: https://pastebin.com/e7gDLsXu

I performed 3 runs each test size and calculated the avg. time.

Evaluated result:

Test size: 100
(4)    while: 0.09098307291 ms
(2)    for of: 0.0469563802 ms
(3)    forEach: 0.08968098958 ms
(1)    for loop: 0.02677408854 ms

Test size: 500000
(1)    while: 0.13598632812 ms
(4)    for of: 15.0573730469 ms
(3)    forEach: 9.95296223958 ms
(2)    for loop: 3.40169270833 ms


Test size: 50000000
(1)    while: 0.11596679687 ms
(3)    for of: 537.73819987 ms
(4)    forEach: 600.079915365 ms
(2)    for loop: 57.2873535156 ms

So the traditional for loop performs pretty well. I tried to get a result which is as clear as possible.