Run results for: for loop vs Array.map

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0

Browser: Firefox 63

Operating system: Windows

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
for-loop	518.7 Ops/sec
Array.map	272.5 Ops/sec

Script Preparation code:

var values = [];
for (var i = 0; i < 256; i++) {
  values[i] = [];
  for (var j = 0; j < 256; j++) {
    values[i][j] = Math.random();
  }
}

Tests:

for-loop
for (var i = 0; i < 256; i++) { for (var j = 0; j < 256; j++) { values[i][j] = values[i][j] < Math.random() ? 1 : 0; } }
Array.map
values = values.map(function(arr) { return arr.map(function(val) { return val < Math.random() ? 1 : 0; }); });