PHP's strncasecmp in TypeScript

How to use

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

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

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	strncasecmp('Price 12.9', 'Price 12.15', 2)	0
2	strncasecmp('Price 12.09', 'Price 12.15', 10)	-1
3	strncasecmp('Price 12.90', 'Price 12.15', 30)	8
4	strncasecmp('Version 12.9', 'Version 12.15', 20)	8
5	strncasecmp('Version 12.15', 'Version 12.9', 20)	-8

Notes

• Returns < 0 if str1 is less than str2 ; > 0 if str1 is greater than str2, and 0 if they are equal.

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

TSTypeScript JSJavaScript TSStandalone TS JSStandalone JS

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export function strncasecmp(argStr1: string, argStr2: string, len: number): number {
  //      discuss at: https://locutus.io/php/strncasecmp/
  // parity verified: PHP 8.3
  //     original by: Saulo Vallory
  //        input by: Nate
  //     bugfixed by: Onno Marsman (https://twitter.com/onnomarsman)
  //          note 1: Returns < 0 if str1 is less than str2 ; > 0
  //          note 1: if str1 is greater than str2, and 0 if they are equal.
  //       example 1: strncasecmp('Price 12.9', 'Price 12.15', 2)
  //       returns 1: 0
  //       example 2: strncasecmp('Price 12.09', 'Price 12.15', 10)
  //       returns 2: -1
  //       example 3: strncasecmp('Price 12.90', 'Price 12.15', 30)
  //       returns 3: 8
  //       example 4: strncasecmp('Version 12.9', 'Version 12.15', 20)
  //       returns 4: 8
  //       example 5: strncasecmp('Version 12.15', 'Version 12.9', 20)
  //       returns 5: -8

  let diff
  let i = 0
  const str1 = (argStr1 + '').toLowerCase().substr(0, len)
  const str2 = (argStr2 + '').toLowerCase().substr(0, len)

  if (str1.length !== str2.length) {
    if (str1.length < str2.length) {
      len = str1.length
      if (str2.substr(0, str1.length) === str1) {
        // return the difference of chars
        return str1.length - str2.length
      }
    } else {
      len = str2.length
      // str1 is longer than str2
      if (str1.substr(0, str2.length) === str2) {
        // return the difference of chars
        return str1.length - str2.length
      }
    }
  } else {
    // Avoids trying to get a char that does not exist
    len = str1.length
  }

  for (diff = 0, i = 0; i < len; i++) {
    diff = str1.charCodeAt(i) - str2.charCodeAt(i)
    if (diff !== 0) {
      return diff
    }
  }

  return 0
}

export function strncasecmp(argStr1, argStr2, len) {
  //      discuss at: https://locutus.io/php/strncasecmp/
  // parity verified: PHP 8.3
  //     original by: Saulo Vallory
  //        input by: Nate
  //     bugfixed by: Onno Marsman (https://twitter.com/onnomarsman)
  //          note 1: Returns < 0 if str1 is less than str2 ; > 0
  //          note 1: if str1 is greater than str2, and 0 if they are equal.
  //       example 1: strncasecmp('Price 12.9', 'Price 12.15', 2)
  //       returns 1: 0
  //       example 2: strncasecmp('Price 12.09', 'Price 12.15', 10)
  //       returns 2: -1
  //       example 3: strncasecmp('Price 12.90', 'Price 12.15', 30)
  //       returns 3: 8
  //       example 4: strncasecmp('Version 12.9', 'Version 12.15', 20)
  //       returns 4: 8
  //       example 5: strncasecmp('Version 12.15', 'Version 12.9', 20)
  //       returns 5: -8

  let diff
  let i = 0
  const str1 = (argStr1 + '').toLowerCase().substr(0, len)
  const str2 = (argStr2 + '').toLowerCase().substr(0, len)

  if (str1.length !== str2.length) {
    if (str1.length < str2.length) {
      len = str1.length
      if (str2.substr(0, str1.length) === str1) {
        // return the difference of chars
        return str1.length - str2.length
      }
    } else {
      len = str2.length
      // str1 is longer than str2
      if (str1.substr(0, str2.length) === str2) {
        // return the difference of chars
        return str1.length - str2.length
      }
    }
  } else {
    // Avoids trying to get a char that does not exist
    len = str1.length
  }

  for (diff = 0, i = 0; i < len; i++) {
    diff = str1.charCodeAt(i) - str2.charCodeAt(i)
    if (diff !== 0) {
      return diff
    }
  }

  return 0
}

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