Run results for: Javascript string.endsWith vs string.slice and triple equal checking vs hardcoded index and triple equal, comparing a single character

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36

Browser: Chrome 138

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

endWith

181.7M/s

hardcoded index

162.4M/s

slice

124.2M/s

View exact numbers

Test name	Executions per second
✓ endWith	181,704,736 Ops/sec
hardcoded index	162,402,848 Ops/sec
slice	124,180,088 Ops/sec

Script Preparation code:

const value = "ABCDEF...WXYZ"
const ending = "Z"

function compareEndsWith(val, comparator) {
  return val.endsWith(comparator)
}
function compareSliceMethod(val, comparator) {
  const thingToCompare = val.slice(-1)
  return thingToCompare === comparator
}
function compareByIndex(val, comparator) {
	return value[12] === comparator
}

Tests:

endWith
const value = "ABCDEF...WXYZ" const ending = "Z" compareEndsWith(value, ending)
slice
const value = "ABCDEF...WXYZ" const ending = "Z" compareSliceMethod(value, ending)
hardcoded index
const value = "ABCDEF...WXYZ" const ending = "Z" compareByIndex(value, ending)