Run results for: Array looping

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:55.0) Gecko/20100101 Firefox/55.0

Browser: Firefox 55

Operating system: Windows

Device Platform: Other

Date tested: 6 years ago

Test name	Executions per second
Simple for loop	219422.4 Ops/sec
Simple for loop (reverse)	181833.6 Ops/sec
Array.forEach	2311734.0 Ops/sec
for loop + Array.entries	55286.5 Ops/sec
while + Array.entries	59888.4 Ops/sec
enumerable for loop (order not important)	7217.1 Ops/sec
enumerable for loop (order is respected)	64033.2 Ops/sec
Array.map	66224.3 Ops/sec
Array.filter	57834.3 Ops/sec
while + Array.entries (condensed)	83428.5 Ops/sec
for loop + Array.entries (condensed)	83394.2 Ops/sec
Simple for loop (condensed)	217659.2 Ops/sec
Instructionless for loop	217397.4 Ops/sec

Script Preparation code:

var arr = [];

for( var cpt = 0; cpt < 1000; cpt++ ) {
  arr.push( Math.random() );
}

var someFn = function( item ) {
  return item * 3 + item / 5;
}

Tests:

Simple for loop
for( var i = 0, n = arr.length; i < n; i++ ) { someFn( arr[ i ] ); }
Simple for loop (reverse)
for( var i = arr.length; i > -1; i-- ) { someFn( arr[ i ] ); }
Array.forEach
arr.forEach( someFn );
for loop + Array.entries
for( var e = arr.entries(), n = e.next(); ! n.done; n = e.next() ) { someFn( n.value[ 1 ] ); }
while + Array.entries
var e = arr.entries(), n = e.next(); while( ! n.done ) { someFn( n.value[ 1 ] ); n = e.next(); }
enumerable for loop (order not important)
for( var i in arr ) { someFn( arr[ i ] ); }
enumerable for loop (order is respected)
for( r of arr ) { someFn( r ); }
Array.map
arr.map( someFn );
Array.filter
arr.filter( someFn );
while + Array.entries (condensed)
var e = arr.entries(), n; while( ! ( n = e.next() ).done ) { someFn( n.value[ 1 ] ); }
for loop + Array.entries (condensed)
for( var e = arr.entries(), n; ! (n = e.next()).done; ) { someFn( n.value[ 1 ] ); }
Simple for loop (condensed)
for( var i = 0, n = arr.length; i < n; ) { someFn( arr[ i++ ] ); }
Instructionless for loop
for( var i = 0, n = arr.length; i < n; someFn( arr[ i++ ] ) ) ;

Run results for: Array looping

Finding out the fastest way to loop through an array

Simple for loop

Simple for loop (reverse)

Array.forEach

for loop + Array.entries

while + Array.entries

enumerable for loop (order not important)

enumerable for loop (order is respected)

Array.map

Array.filter

while + Array.entries (condensed)

for loop + Array.entries (condensed)

Simple for loop (condensed)

Instructionless for loop