Python's math.isfinite in TypeScript

How to use

Install via yarn add locutus and import: import { isfinite } from 'locutus/python/math/isfinite'.

Or with CommonJS: const { isfinite } = require('locutus/python/math/isfinite')

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	isfinite(42)	true
2	isfinite(Infinity)	false
3	isfinite(NaN)	false

Notes

• Returns True if x is neither infinity nor NaN

Here's what our current TypeScript equivalent to Python's math.isfinite looks like.

TSTypeScript JSJavaScript TSStandalone TS JSStandalone JS

Copy code

export function isfinite(x: number): boolean {
  //      discuss at: https://locutus.io/python/isfinite/
  // parity verified: Python 3.12
  //     original by: Kevin van Zonneveld (https://kvz.io)
  //          note 1: Returns True if x is neither infinity nor NaN
  //       example 1: isfinite(42)
  //       returns 1: true
  //       example 2: isfinite(Infinity)
  //       returns 2: false
  //       example 3: isfinite(NaN)
  //       returns 3: false

  return Number.isFinite(x)
}

export function isfinite(x) {
  //      discuss at: https://locutus.io/python/isfinite/
  // parity verified: Python 3.12
  //     original by: Kevin van Zonneveld (https://kvz.io)
  //          note 1: Returns True if x is neither infinity nor NaN
  //       example 1: isfinite(42)
  //       returns 1: true
  //       example 2: isfinite(Infinity)
  //       returns 2: false
  //       example 3: isfinite(NaN)
  //       returns 3: false

  return Number.isFinite(x)
}

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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