PHP's lcfirst in TypeScript

How to use

Install via yarn add locutus and import: import { lcfirst } from 'locutus/php/strings/lcfirst'.

Or with CommonJS: const { lcfirst } = require('locutus/php/strings/lcfirst')

Use a bundler that supports tree-shaking so you only ship the functions you actually use. Vite, webpack, Rollup, and Parcel all handle this. For server-side use this is less of a concern.

Examples

These examples are extracted from test cases that automatically verify our functions against their native counterparts.

#	code	expected result
1	lcfirst('Kevin Van Zonneveld')	'kevin Van Zonneveld'

Here's what our current TypeScript equivalent to PHP's lcfirst looks like.

TSTypeScript JSJavaScript TSStandalone TS JSStandalone JS

Copy code

export function lcfirst(str: string): string {
  //      discuss at: https://locutus.io/php/lcfirst/
  // parity verified: PHP 8.3
  //     original by: Brett Zamir (https://brett-zamir.me)
  //       example 1: lcfirst('Kevin Van Zonneveld')
  //       returns 1: 'kevin Van Zonneveld'

  str += ''
  const f = str.charAt(0).toLowerCase()
  return f + str.substr(1)
}

export function lcfirst(str) {
  //      discuss at: https://locutus.io/php/lcfirst/
  // parity verified: PHP 8.3
  //     original by: Brett Zamir (https://brett-zamir.me)
  //       example 1: lcfirst('Kevin Van Zonneveld')
  //       returns 1: 'kevin Van Zonneveld'

  str += ''
  const f = str.charAt(0).toLowerCase()
  return f + str.substr(1)
}

Improve this function

Locutus is a community effort following The McDonald's Theory: we ship first iterations, hoping others will improve them. If you see something that could be better, we'd love your contribution.

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