PHP's array_unique in TypeScript

How to use

Install via yarn add locutus and import: import { array_unique } from 'locutus/php/array/array_unique'.

Or with CommonJS: const { array_unique } = require('locutus/php/array/array_unique')

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	array_unique(['Kevin','Kevin','van','Zonneveld','Kevin'])	{0: 'Kevin', 2: 'van', 3: 'Zonneveld'}
2	array_unique({'a': 'green', 0: 'red', 'b': 'green', 1: 'blue', 2: 'red'})	{a: 'green', 0: 'red', 1: 'blue'}

PHP arrays and TypeScript/JavaScript

Please note that Locutus uses TypeScript/JavaScript objects as substitutes for PHP arrays, they are the closest we can get to this hashtable-like data structure without rolling our own. While many TypeScript/JavaScript implementations preserve the order of object properties, the ECMAScript Language Specification explicitly states that:

The mechanics and order of enumerating the properties is not specified.

In practice most engines preserve insertion order, but if your code depends on key ordering across platforms, keep this caveat in mind.

To influence how Locutus treats objects as arrays, you can check out the locutus.objectsAsArrays setting.

Notes

• The second argument, sort_flags is not implemented; also should be sorted (asort?) first according to docs

Dependencies

This function uses the following Locutus functions:

• _phpTypes (php/_helpers)

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

TSTypeScript JSJavaScript TSStandalone TS JSStandalone JS

Copy code

import { entriesOfPhpAssoc, type PhpAssoc, toPhpArrayObject } from '../_helpers/_phpTypes.ts'

export function array_unique<T>(inputArr: T[] | PhpAssoc<T>): PhpAssoc<T> | false {
  //  discuss at: https://locutus.io/php/array_unique/
  // original by: Carlos R. L. Rodrigues (https://www.jsfromhell.com)
  //    input by: duncan
  //    input by: Brett Zamir (https://brett-zamir.me)
  // bugfixed by: Kevin van Zonneveld (https://kvz.io)
  // bugfixed by: Nate
  // bugfixed by: Kevin van Zonneveld (https://kvz.io)
  // bugfixed by: Brett Zamir (https://brett-zamir.me)
  // improved by: Michael Grier
  //      note 1: The second argument, sort_flags is not implemented;
  //      note 1: also should be sorted (asort?) first according to docs
  //   example 1: array_unique(['Kevin','Kevin','van','Zonneveld','Kevin'])
  //   returns 1: {0: 'Kevin', 2: 'van', 3: 'Zonneveld'}
  //   example 2: array_unique({'a': 'green', 0: 'red', 'b': 'green', 1: 'blue', 2: 'red'})
  //   returns 2: {a: 'green', 0: 'red', 1: 'blue'}

  const tmpArr2: PhpAssoc<T> = {}
  const inputObj = toPhpArrayObject<T>(inputArr)

  const _arraySearch = function (needle: T, haystack: PhpAssoc<T>): string | false {
    let fkey = ''
    for (fkey in haystack) {
      if (Object.hasOwn(haystack, fkey)) {
        if (String(haystack[fkey]) === String(needle)) {
          return fkey
        }
      }
    }
    return false
  }

  for (const [key, val] of entriesOfPhpAssoc(inputObj)) {
    if (_arraySearch(val, tmpArr2) === false) {
      tmpArr2[key] = val
    }
  }

  return tmpArr2
}

import { entriesOfPhpAssoc, toPhpArrayObject } from '../_helpers/_phpTypes.ts'

export function array_unique(inputArr) {
  //  discuss at: https://locutus.io/php/array_unique/
  // original by: Carlos R. L. Rodrigues (https://www.jsfromhell.com)
  //    input by: duncan
  //    input by: Brett Zamir (https://brett-zamir.me)
  // bugfixed by: Kevin van Zonneveld (https://kvz.io)
  // bugfixed by: Nate
  // bugfixed by: Kevin van Zonneveld (https://kvz.io)
  // bugfixed by: Brett Zamir (https://brett-zamir.me)
  // improved by: Michael Grier
  //      note 1: The second argument, sort_flags is not implemented;
  //      note 1: also should be sorted (asort?) first according to docs
  //   example 1: array_unique(['Kevin','Kevin','van','Zonneveld','Kevin'])
  //   returns 1: {0: 'Kevin', 2: 'van', 3: 'Zonneveld'}
  //   example 2: array_unique({'a': 'green', 0: 'red', 'b': 'green', 1: 'blue', 2: 'red'})
  //   returns 2: {a: 'green', 0: 'red', 1: 'blue'}

  const tmpArr2 = {}
  const inputObj = toPhpArrayObject(inputArr)

  const _arraySearch = function (needle, haystack) {
    let fkey = ''
    for (fkey in haystack) {
      if (Object.hasOwn(haystack, fkey)) {
        if (String(haystack[fkey]) === String(needle)) {
          return fkey
        }
      }
    }
    return false
  }

  for (const [key, val] of entriesOfPhpAssoc(inputObj)) {
    if (_arraySearch(val, tmpArr2) === false) {
      tmpArr2[key] = val
    }
  }

  return tmpArr2
}

// php/_helpers/_phpTypes (Locutus helper dependency)
type PhpNullish = null | undefined

type PhpInput = {} | PhpNullish

type PhpList<T = PhpInput> = T[]

type PhpAssoc<T = PhpInput> = { [key: string]: T }

type PhpArrayLike<T = PhpInput> = PhpList<T> | PhpAssoc<T>

const entriesOfPhpAssoc = <T>(value: PhpAssoc<T>): Array<[string, T]> => {
  return Object.entries(value)
}

function isObjectLike(value: PhpInput): value is PhpArrayLike<PhpInput> {
  return typeof value === 'object' && value !== null
}

function isPhpArrayObject<T = PhpInput>(value: PhpInput): value is PhpAssoc<T> {
  return isObjectLike(value)
}

function toPhpArrayObject<T = PhpInput>(value: PhpInput): PhpAssoc<T> {
  if (isPhpArrayObject<T>(value)) {
    return value
  }

  return {}
}

// php/array/array_unique (target function module)
function array_unique<T>(inputArr: T[] | PhpAssoc<T>): PhpAssoc<T> | false {
  //  discuss at: https://locutus.io/php/array_unique/
  // original by: Carlos R. L. Rodrigues (https://www.jsfromhell.com)
  //    input by: duncan
  //    input by: Brett Zamir (https://brett-zamir.me)
  // bugfixed by: Kevin van Zonneveld (https://kvz.io)
  // bugfixed by: Nate
  // bugfixed by: Kevin van Zonneveld (https://kvz.io)
  // bugfixed by: Brett Zamir (https://brett-zamir.me)
  // improved by: Michael Grier
  //      note 1: The second argument, sort_flags is not implemented;
  //      note 1: also should be sorted (asort?) first according to docs
  //   example 1: array_unique(['Kevin','Kevin','van','Zonneveld','Kevin'])
  //   returns 1: {0: 'Kevin', 2: 'van', 3: 'Zonneveld'}
  //   example 2: array_unique({'a': 'green', 0: 'red', 'b': 'green', 1: 'blue', 2: 'red'})
  //   returns 2: {a: 'green', 0: 'red', 1: 'blue'}

  const tmpArr2: PhpAssoc<T> = {}
  const inputObj = toPhpArrayObject<T>(inputArr)

  const _arraySearch = function (needle: T, haystack: PhpAssoc<T>): string | false {
    let fkey = ''
    for (fkey in haystack) {
      if (Object.hasOwn(haystack, fkey)) {
        if (String(haystack[fkey]) === String(needle)) {
          return fkey
        }
      }
    }
    return false
  }

  for (const [key, val] of entriesOfPhpAssoc(inputObj)) {
    if (_arraySearch(val, tmpArr2) === false) {
      tmpArr2[key] = val
    }
  }

  return tmpArr2
}

// php/_helpers/_phpTypes (Locutus helper dependency)

function isPhpArrayObject(value) {
  return typeof value === 'object' && value !== null
}

function toPhpArrayObject(value) {
  if (isPhpArrayObject(value)) {
    return value
  }

  return {}
}

// php/array/array_unique (target function module)
function array_unique(inputArr) {
  //  discuss at: https://locutus.io/php/array_unique/
  // original by: Carlos R. L. Rodrigues (https://www.jsfromhell.com)
  //    input by: duncan
  //    input by: Brett Zamir (https://brett-zamir.me)
  // bugfixed by: Kevin van Zonneveld (https://kvz.io)
  // bugfixed by: Nate
  // bugfixed by: Kevin van Zonneveld (https://kvz.io)
  // bugfixed by: Brett Zamir (https://brett-zamir.me)
  // improved by: Michael Grier
  //      note 1: The second argument, sort_flags is not implemented;
  //      note 1: also should be sorted (asort?) first according to docs
  //   example 1: array_unique(['Kevin','Kevin','van','Zonneveld','Kevin'])
  //   returns 1: {0: 'Kevin', 2: 'van', 3: 'Zonneveld'}
  //   example 2: array_unique({'a': 'green', 0: 'red', 'b': 'green', 1: 'blue', 2: 'red'})
  //   returns 2: {a: 'green', 0: 'red', 1: 'blue'}

  const tmpArr2 = {}
  const inputObj = toPhpArrayObject(inputArr)

  const _arraySearch = function (needle, haystack) {
    let fkey = ''
    for (fkey in haystack) {
      if (Object.hasOwn(haystack, fkey)) {
        if (String(haystack[fkey]) === String(needle)) {
          return fkey
        }
      }
    }
    return false
  }

  for (const [key, val] of Object.entries(inputObj)) {
    if (_arraySearch(val, tmpArr2) === false) {
      tmpArr2[key] = val
    }
  }

  return tmpArr2
}

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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