PHP's is_null in TypeScript

How to use

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

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

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_null('23')	false
2	is_null(null)	true

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

TSTypeScript JSJavaScript TSStandalone TS JSStandalone JS

Copy code

export function is_null(mixedVar: string | null): boolean {
  //      discuss at: https://locutus.io/php/is_null/
  // parity verified: PHP 8.3
  //     original by: Kevin van Zonneveld (https://kvz.io)
  //       example 1: is_null('23')
  //       returns 1: false
  //       example 2: is_null(null)
  //       returns 2: true

  return mixedVar === null
}

export function is_null(mixedVar) {
  //      discuss at: https://locutus.io/php/is_null/
  // parity verified: PHP 8.3
  //     original by: Kevin van Zonneveld (https://kvz.io)
  //       example 1: is_null('23')
  //       returns 1: false
  //       example 2: is_null(null)
  //       returns 2: true

  return mixedVar === null
}

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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