Run results for: isfn vs switch

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36

Browser: Chrome 119

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

isCollection2

7.0M/s

isCollection1

2.8M/s

View exact numbers

Test name	Executions per second
✓ isCollection2	7,008,870 Ops/sec
isCollection1	2,756,192 Ops/sec

Script Preparation code:

var isMap = (val) => val?.constructor?.name === 'Map'
var isSet = (val) => val?.constructor?.name === 'Set'
var isWeakMap = (val) => val?.constructor?.name === 'WeakMap'
var isWeakSet = (val) => val?.constructor?.name === 'WeakSet'

var isCollection1 = (val) => isMap(val) || isSet(val) || isWeakMap(val) || isWeakSet(val)
var isCollection2 = (val) => {
	switch(val?.constructor?.name) {
case 'Map':
case 'Set':
case 'WeakMap':
case 'WeakSet':
	return true
    default:
return false
	}
}

console.log(isCollection1(new Set()), isCollection1(123))
console.log(isCollection2(new Set()), isCollection2(123))

Tests:

isCollection1
var a = isCollection1(new Set()) var b = isCollection1(123)
isCollection2
var a = isCollection2(new Set()) var b = isCollection2(123)