PHP's str_repeat in TypeScript

How to use

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

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

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	str_repeat('-=', 10)	'-=-=-=-=-=-=-=-=-=-='

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

TSTypeScript JSJavaScript TSStandalone TS JSStandalone JS

Copy code

export function str_repeat(input: string, multiplier: number): string {
  //      discuss at: https://locutus.io/php/str_repeat/
  // parity verified: PHP 8.3
  //     original by: Kevin van Zonneveld (https://kvz.io)
  //     improved by: Jonas Raoni Soares Silva (https://www.jsfromhell.com)
  //     improved by: Ian Carter (https://euona.com/)
  //       example 1: str_repeat('-=', 10)
  //       returns 1: '-=-=-=-=-=-=-=-=-=-='

  let y = ''
  while (true) {
    if (multiplier & 1) {
      y += input
    }
    multiplier >>= 1
    if (multiplier) {
      input += input
    } else {
      break
    }
  }
  return y
}

export function str_repeat(input, multiplier) {
  //      discuss at: https://locutus.io/php/str_repeat/
  // parity verified: PHP 8.3
  //     original by: Kevin van Zonneveld (https://kvz.io)
  //     improved by: Jonas Raoni Soares Silva (https://www.jsfromhell.com)
  //     improved by: Ian Carter (https://euona.com/)
  //       example 1: str_repeat('-=', 10)
  //       returns 1: '-=-=-=-=-=-=-=-=-=-='

  let y = ''
  while (true) {
    if (multiplier & 1) {
      y += input
    }
    multiplier >>= 1
    if (multiplier) {
      input += input
    } else {
      break
    }
  }
  return y
}

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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