PHP's is_integer in TypeScript

How to use

Install via yarn add locutus and import: import { is_integer } from 'locutus/php/var/is_integer'.

Or with CommonJS: const { is_integer } = require('locutus/php/var/is_integer')

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	is_integer(186.31)	false
2	is_integer(12)	true

Notes

• 1.0 is simplified to 1 before it can be accessed by the function, this makes it different from the PHP implementation. We can’t fix this unfortunately.

Dependencies

This function uses the following Locutus functions:

• is_int (php/var)

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

TSTypeScript JSJavaScript TSStandalone TS JSStandalone JS

Copy code

import { is_int as _isInt } from '../var/is_int.ts'

export function is_integer(mixedVar: number): boolean {
  //      discuss at: https://locutus.io/php/is_integer/
  // parity verified: PHP 8.3
  //     original by: Paulo Freitas
  //          note 1: 1.0 is simplified to 1 before it can be accessed by the function, this makes
  //          note 1: it different from the PHP implementation. We can't fix this unfortunately.
  //       example 1: is_integer(186.31)
  //       returns 1: false
  //       example 2: is_integer(12)
  //       returns 2: true

  return _isInt(mixedVar)
}

import { is_int as _isInt } from '../var/is_int.ts'

export function is_integer(mixedVar) {
  //      discuss at: https://locutus.io/php/is_integer/
  // parity verified: PHP 8.3
  //     original by: Paulo Freitas
  //          note 1: 1.0 is simplified to 1 before it can be accessed by the function, this makes
  //          note 1: it different from the PHP implementation. We can't fix this unfortunately.
  //       example 1: is_integer(186.31)
  //       returns 1: false
  //       example 2: is_integer(12)
  //       returns 2: true

  return _isInt(mixedVar)
}

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

type PhpInput = {} | PhpNullish

type PhpScalar = string | number | boolean

type PhpPrimitive = PhpScalar | bigint

type PhpFunctionValue = (...args: PhpInput[]) => PhpInput

interface PhpRuntimeAssoc {
  [key: string]: PhpRuntimeValue
}

interface PhpRuntimeList extends Array<PhpRuntimeValue> {}

type PhpRuntimeValue = PhpPrimitive | PhpNullish | PhpRuntimeList | PhpRuntimeAssoc | PhpFunctionValue

// php/var/is_int (Locutus dependency module)
type IntValue = PhpRuntimeValue

function is_int(mixedVar: IntValue): mixedVar is number {
  //      discuss at: https://locutus.io/php/is_int/
  // parity verified: PHP 8.3
  //     original by: Alex
  //     improved by: Kevin van Zonneveld (https://kvz.io)
  //     improved by: WebDevHobo (https://webdevhobo.blogspot.com/)
  //     improved by: Rafał Kukawski (https://blog.kukawski.pl)
  //      revised by: Matt Bradley
  //     bugfixed by: Kevin van Zonneveld (https://kvz.io)
  //          note 1: 1.0 is simplified to 1 before it can be accessed by the function, this makes
  //          note 1: it different from the PHP implementation. We can't fix this unfortunately.
  //       example 1: is_int(23)
  //       returns 1: true
  //       example 2: is_int('23')
  //       returns 2: false
  //       example 3: is_int(23.5)
  //       returns 3: false
  //       example 4: is_int(true)
  //       returns 4: false

  const num = Number(mixedVar)
  return typeof mixedVar === 'number' && mixedVar === num && Number.isFinite(num) && Number.isInteger(num)
}

// php/var/is_integer (target function module)
const _isInt = is_int;

function is_integer(mixedVar: number): boolean {
  //      discuss at: https://locutus.io/php/is_integer/
  // parity verified: PHP 8.3
  //     original by: Paulo Freitas
  //          note 1: 1.0 is simplified to 1 before it can be accessed by the function, this makes
  //          note 1: it different from the PHP implementation. We can't fix this unfortunately.
  //       example 1: is_integer(186.31)
  //       returns 1: false
  //       example 2: is_integer(12)
  //       returns 2: true

  return _isInt(mixedVar)
}

// php/var/is_int (Locutus dependency module)
function is_int(mixedVar) {
  //      discuss at: https://locutus.io/php/is_int/
  // parity verified: PHP 8.3
  //     original by: Alex
  //     improved by: Kevin van Zonneveld (https://kvz.io)
  //     improved by: WebDevHobo (https://webdevhobo.blogspot.com/)
  //     improved by: Rafał Kukawski (https://blog.kukawski.pl)
  //      revised by: Matt Bradley
  //     bugfixed by: Kevin van Zonneveld (https://kvz.io)
  //          note 1: 1.0 is simplified to 1 before it can be accessed by the function, this makes
  //          note 1: it different from the PHP implementation. We can't fix this unfortunately.
  //       example 1: is_int(23)
  //       returns 1: true
  //       example 2: is_int('23')
  //       returns 2: false
  //       example 3: is_int(23.5)
  //       returns 3: false
  //       example 4: is_int(true)
  //       returns 4: false

  const num = Number(mixedVar)
  return typeof mixedVar === 'number' && mixedVar === num && Number.isFinite(num) && Number.isInteger(num)
}

// php/var/is_integer (target function module)
const _isInt = is_int

function is_integer(mixedVar) {
  //      discuss at: https://locutus.io/php/is_integer/
  // parity verified: PHP 8.3
  //     original by: Paulo Freitas
  //          note 1: 1.0 is simplified to 1 before it can be accessed by the function, this makes
  //          note 1: it different from the PHP implementation. We can't fix this unfortunately.
  //       example 1: is_integer(186.31)
  //       returns 1: false
  //       example 2: is_integer(12)
  //       returns 2: true

  return _isInt(mixedVar)
}

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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