PHP's is_bool in TypeScript

How to use

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

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

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_bool(false)	true
2	is_bool(0)	false

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

TSTypeScript JSJavaScript TSStandalone TS JSStandalone JS

Copy code

export function is_bool(mixedVar: boolean | number): boolean {
  //      discuss at: https://locutus.io/php/is_bool/
  // parity verified: PHP 8.3
  //     original by: Onno Marsman (https://twitter.com/onnomarsman)
  //     improved by: CoursesWeb (https://www.coursesweb.net/)
  //       example 1: is_bool(false)
  //       returns 1: true
  //       example 2: is_bool(0)
  //       returns 2: false

  return mixedVar === true || mixedVar === false // Faster (in FF) than type checking
}

export function is_bool(mixedVar) {
  //      discuss at: https://locutus.io/php/is_bool/
  // parity verified: PHP 8.3
  //     original by: Onno Marsman (https://twitter.com/onnomarsman)
  //     improved by: CoursesWeb (https://www.coursesweb.net/)
  //       example 1: is_bool(false)
  //       returns 1: true
  //       example 2: is_bool(0)
  //       returns 2: false

  return mixedVar === true || mixedVar === false // Faster (in FF) than type checking
}

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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