PHP's doubleval in TypeScript

How to use

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

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

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	doubleval(186)	186.00

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:

• floatval (php/var)

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

TSTypeScript JSJavaScript TSStandalone TS JSStandalone JS

Copy code

import { type FloatvalInput, floatval } from '../var/floatval.ts'

export function doubleval(mixedVar: FloatvalInput): number {
  //      discuss at: https://locutus.io/php/doubleval/
  // parity verified: PHP 8.3
  //     original by: Brett Zamir (https://brett-zamir.me)
  //          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: doubleval(186)
  //       returns 1: 186.00

  return floatval(mixedVar)
}

import { floatval } from '../var/floatval.ts'

export function doubleval(mixedVar) {
  //      discuss at: https://locutus.io/php/doubleval/
  // parity verified: PHP 8.3
  //     original by: Brett Zamir (https://brett-zamir.me)
  //          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: doubleval(186)
  //       returns 1: 186.00

  return floatval(mixedVar)
}

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

type NumericLike = number | bigint | string

// php/var/floatval (Locutus dependency module)
type FloatvalInput = NumericLike | boolean | PhpNullish

function floatval(mixedVar: FloatvalInput): number {
  //      discuss at: https://locutus.io/php/floatval/
  // parity verified: PHP 8.3
  //     original by: Michael White (https://getsprink.com)
  //          note 1: The native parseFloat() method of JavaScript returns NaN
  //          note 1: when it encounters a string before an int or float value.
  //       example 1: floatval('150.03_page-section')
  //       returns 1: 150.03
  //       example 2: floatval('page: 3')
  //       example 2: floatval('-50 + 8')
  //       returns 2: 0
  //       returns 2: -50

  return parseFloat(String(mixedVar ?? '')) || 0
}

// php/var/doubleval (target function module)
function doubleval(mixedVar: FloatvalInput): number {
  //      discuss at: https://locutus.io/php/doubleval/
  // parity verified: PHP 8.3
  //     original by: Brett Zamir (https://brett-zamir.me)
  //          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: doubleval(186)
  //       returns 1: 186.00

  return floatval(mixedVar)
}

// php/var/floatval (Locutus dependency module)
function floatval(mixedVar) {
  //      discuss at: https://locutus.io/php/floatval/
  // parity verified: PHP 8.3
  //     original by: Michael White (https://getsprink.com)
  //          note 1: The native parseFloat() method of JavaScript returns NaN
  //          note 1: when it encounters a string before an int or float value.
  //       example 1: floatval('150.03_page-section')
  //       returns 1: 150.03
  //       example 2: floatval('page: 3')
  //       example 2: floatval('-50 + 8')
  //       returns 2: 0
  //       returns 2: -50

  return parseFloat(String(mixedVar ?? '')) || 0
}

// php/var/doubleval (target function module)
function doubleval(mixedVar) {
  //      discuss at: https://locutus.io/php/doubleval/
  // parity verified: PHP 8.3
  //     original by: Brett Zamir (https://brett-zamir.me)
  //          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: doubleval(186)
  //       returns 1: 186.00

  return floatval(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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