Run results for: array.includes vs array.indexOf vs set.has vs weakSet.has

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36

Browser: Chrome 138

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

set.has

121.4M/s

weakSet.has

68.5M/s

array.indexOf

35.9M/s

array.includes

35.1M/s

View exact numbers

Test name	Executions per second
✓ set.has	121,388,128 Ops/sec
weakSet.has	68,537,480 Ops/sec
array.indexOf	35,947,004 Ops/sec
array.includes	35,088,812 Ops/sec

Script Preparation code:

var array = []
var set = new Set()
var weakSet = new WeakSet()

var target = {}

let i = 100
while (i--) {
    array.push({})
	set.add({})
    weakSet.add({})
}

array.push(target)
set.add(target)
weakSet.add(target)

Tests:

array.includes
array.includes(target)
array.indexOf
array.indexOf(target)
set.has
set.has(target)
weakSet.has
weakSet.has(target)