PHP's str_pad in JavaScript

How to use

You you can install via yarn add locutus and require this function via const str_pad = require('locutus/php/strings/str_pad').

It is important to use a bundler that supports tree-shaking so that you only ship the functions that you actually use to your browser, instead of all of Locutus, which is massive. Examples are: Parcel, webpack, or rollup.js. For server-side use this is typically less of a concern.

Examples

Please note that these examples are distilled from test cases that automatically verify our functions still work correctly. This could explain some quirky ones.

#	code	expected result
1	str_pad('Kevin van Zonneveld', 30, '-=', 'STR_PAD_LEFT')	'-=-=-=-=-=-Kevin van Zonneveld'
2	str_pad('Kevin van Zonneveld', 30, '-', 'STR_PAD_BOTH')	'------Kevin van Zonneveld-----'

Here’s what our current JavaScript equivalent to PHP's str_pad looks like.

module.exports = function str_pad(input, padLength, padString, padType) {
  //  discuss at: https://locutus.io/php/str_pad/
  // original by: Kevin van Zonneveld (https://kvz.io)
  // improved by: Michael White (https://getsprink.com)
  //    input by: Marco van Oort
  // bugfixed by: Brett Zamir (https://brett-zamir.me)
  //   example 1: str_pad('Kevin van Zonneveld', 30, '-=', 'STR_PAD_LEFT')
  //   returns 1: '-=-=-=-=-=-Kevin van Zonneveld'
  //   example 2: str_pad('Kevin van Zonneveld', 30, '-', 'STR_PAD_BOTH')
  //   returns 2: '------Kevin van Zonneveld-----'

  let half = ''
  let padToGo

  const _strPadRepeater = function (s, len) {
    let collect = ''

    while (collect.length < len) {
      collect += s
    }
    collect = collect.substr(0, len)

    return collect
  }

  input += ''
  padString = padString !== undefined ? padString : ' '

  if (padType !== 'STR_PAD_LEFT' && padType !== 'STR_PAD_RIGHT' && padType !== 'STR_PAD_BOTH') {
    padType = 'STR_PAD_RIGHT'
  }
  if ((padToGo = padLength - input.length) > 0) {
    if (padType === 'STR_PAD_LEFT') {
      input = _strPadRepeater(padString, padToGo) + input
    } else if (padType === 'STR_PAD_RIGHT') {
      input = input + _strPadRepeater(padString, padToGo)
    } else if (padType === 'STR_PAD_BOTH') {
      half = _strPadRepeater(padString, Math.ceil(padToGo / 2))
      input = half + input + half
      input = input.substr(0, padLength)
    }
  }

  return input
}

A community effort

Not unlike Wikipedia, Locutus is an ongoing community effort. Our philosophy follows The McDonald’s Theory. This means that we assimilate first iterations with imperfections, hoping for others to take issue with-and improve them. This unorthodox approach has worked very well to foster fun and fruitful collaboration, but please be reminded to use our creations at your own risk. THE SOFTWARE IS PROVIDED "AS IS" has never been more true than for Locutus.

Now go and: [ View on GitHub | Edit on GitHub | View Raw ]

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