Run results for: Precompile RegExp vs Runtime (on the fly)

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser: Chrome 131

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Precompile	1648323.2 Ops/sec
Runtime	1502985.0 Ops/sec

Script Preparation code:

const str = 'someTextWith333Digits'

const p1 = /[a-z](?=\d)|\d(?=[a-z])/gi
const p2 = /([A-Z]|([a-zA-Z]\d))/g
const p3 = /^./
  
var toSpacePascalCasePrecompile = value => (
  value
    // insert a space before/after number
    .replace(p1, '$& ')
    // insert a space before all caps
    .replace(p2, ' $1')
    // uppercase the first character
    .replace(p3, str => str.toUpperCase())
)

var toSpacePascalCaseRuntime = value => (
  value
    // insert a space before/after number
    .replace(/[a-z](?=\d)|\d(?=[a-z])/gi, '$& ')
    // insert a space before all caps
    .replace(/([A-Z]|([a-zA-Z]\d))/g, ' $1')
    // uppercase the first character
    .replace(/^./, str => str.toUpperCase())
)

Tests:

Precompile
toSpacePascalCasePrecompile('someTextWith333Digits')
Runtime
toSpacePascalCaseRuntime('someTextWith333Digits')

Run results for: Precompile RegExp vs Runtime (on the fly)

Is precompile version faster then on runtime? Function toSpacePascalCase() convert 'someTextWith333Digits' to 'Some Text With 333 Digits'

Precompile

Runtime