Run results for: unshift01001001 - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.96 Safari/537.36

Browser: Chrome 88

Operating system: Linux

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
[123].concat(a)	64307.1 Ops/sec
console.log(a.length)	101421.0 Ops/sec
unshift	30766.0 Ops/sec
console.log(a.length) - 2	17043.9 Ops/sec

Script Preparation code:

a = [1,2,3,4,5]
setTimeout(()=>{console.log('start')}, 500)

Tests:

[123].concat(a)
b = [123].concat(a) console.log(b)
console.log(a.length)
console.log(a.length)
unshift
a.unshift(123) console.log(b)
console.log(a.length) - 2
console.log(a.length)