Clojure's string/blank in TypeScript

How to use

Install via yarn add locutus and import: import { blank } from 'locutus/clojure/string/blank'.

Or with CommonJS: const { blank } = require('locutus/clojure/string/blank')

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	blank('')	true
2	blank(' ')	true
3	blank('hello')	false

Notes

• Clojure uses blank?, JS uses blank

Here's what our current TypeScript equivalent to Clojure's string/blank looks like.

TSTypeScript JSJavaScript TSStandalone TS JSStandalone JS

Copy code

export function blank(s: string): boolean {
  //      discuss at: https://locutus.io/clojure/blank/
  // parity verified: Clojure 1.12
  //     original by: Kevin van Zonneveld (https://kvz.io)
  //          note 1: Clojure uses blank?, JS uses blank
  //       example 1: blank('')
  //       returns 1: true
  //       example 2: blank('  ')
  //       returns 2: true
  //       example 3: blank('hello')
  //       returns 3: false

  if (s === null || s === undefined) {
    return true
  }
  return String(s).trim().length === 0
}

export function blank(s) {
  //      discuss at: https://locutus.io/clojure/blank/
  // parity verified: Clojure 1.12
  //     original by: Kevin van Zonneveld (https://kvz.io)
  //          note 1: Clojure uses blank?, JS uses blank
  //       example 1: blank('')
  //       returns 1: true
  //       example 2: blank('  ')
  //       returns 2: true
  //       example 3: blank('hello')
  //       returns 3: false

  if (s === null || s === undefined) {
    return true
  }
  return String(s).trim().length === 0
}

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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