Run results for: Iterate-Set

Run details:

User agent: Mozilla/5.0 (X11; CrOS x86_64 13421.99.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.198 Safari/537.36

Browser: Chrome 86

Operating system: Chrome OS 13421.99.0

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
for of: few items	4008996.2 Ops/sec
for of: many items	122571.0 Ops/sec
convert to array: few items	1364866.6 Ops/sec
convert to array: many items	90583.9 Ops/sec
native iterator: few items	4373201.5 Ops/sec
native iterator: many items	130323.9 Ops/sec
native iterator w/ size: few items	2374534.0 Ops/sec
native iterator w/ size: many items:	114711.7 Ops/sec

Script Preparation code:

var fewItemSet = new Set([1, 2, 3]);
var manyItemSet = new Set(Array.from({ length: 1000 }, (_, i) => i));

Tests:

for of: few items
let result = 0; for (const item of fewItemSet) { result += item; }
for of: many items
let result = 0; for (const item of manyItemSet) { result += item; }
convert to array: few items
let result = 0; const arr = Array.from(fewItemSet); for (let i = arr.length; i--;) { result += arr[i]; }
convert to array: many items
let result = 0; const arr = Array.from(manyItemSet); for (let i = arr.length; i--;) { result += arr[i]; }
native iterator: few items
let result = 0; let val = null; const iter = fewItemSet.values(); while (!(val = iter.next()).done) { result += val.value; }
native iterator: many items
let result = 0; let val = null; const iter = manyItemSet.values(); while (!(val = iter.next()).done) { result += val.value; }
native iterator w/ size: few items
let result = 0; let iter = fewItemSet.values(); for (let i = fewItemSet.size; i--;) { result += iter.next().value; }
native iterator w/ size: many items:
let result = 0; let iter = manyItemSet.values(); for (let i = manyItemSet.size; i--;) { result += iter.next().value; }