Run results for: Date comparison number and conversion

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:109.0) Gecko/20100101 Firefox/110.0

Browser: Firefox 110

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Sort on string	1157.7 Ops/sec
Convert to date, then sort	226.7 Ops/sec
Convert to number, then sort	214.2 Ops/sec

Script Preparation code:

var size = 10000
var arr = []
const now = +new Date()
for (let i = 0; i < size; i++) {
    arr.push({
      createdAt: new Date(now+1000*i).toISOString() 
    })
}

Tests:

Sort on string
const result = arr.sort((a, b) => a.createdAt < b.createdAt)
Convert to date, then sort
const result = arr.sort((a, b) => new Date(a.createdAt) < new Date(b.createdAt))
Convert to number, then sort
const result = arr.sort((a, b) => +new Date(a.createdAt) < +new Date(b.createdAt))

Run results for: Date comparison number and conversion

Sort on string

Convert to date, then sort

Convert to number, then sort