PHP's boolval in JavaScript

Here’s what our current JavaScript equivalent to PHP's boolval looks like.

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module.exports = function boolval (mixedVar) {
// original by: Will Rowe
// example 1: boolval(true)
// returns 1: true
// example 2: boolval(false)
// returns 2: false
// example 3: boolval(0)
// returns 3: false
// example 4: boolval(0.0)
// returns 4: false
// example 5: boolval('')
// returns 5: false
// example 6: boolval('0')
// returns 6: false
// example 7: boolval([])
// returns 7: false
// example 8: boolval('')
// returns 8: false
// example 9: boolval(null)
// returns 9: false
// example 10: boolval(undefined)
// returns 10: false
// example 11: boolval('true')
// returns 11: true
if (mixedVar === false) {
return false
}
if (mixedVar === 0 || mixedVar === 0.0) {
return false
}
if (mixedVar === '' || mixedVar === '0') {
return false
}
if (Array.isArray(mixedVar) && mixedVar.length === 0) {
return false
}
if (mixedVar === null || mixedVar === undefined) {
return false
}
return true
}
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How to use

You you can install via npm install locutus and require it via require('locutus/php/var/boolval'). You could also require the var module in full so that you could access var.boolval instead.

If you intend to target the browser, you can then use a module bundler such as Browserify, webpack or rollup.js.

ES5/ES6

This function targets ES5, but as of Locutus 2.0.2 we also support ES6 functions. Locutus transpiles to ES5 before publishing to npm.

A community effort

Not unlike Wikipedia, Locutus is an ongoing community effort. Our philosophy follows The McDonald’s Theory. This means that we don't consider it to be a bad thing that many of our functions are first iterations, which may still have their fair share of issues. We hope that these flaws will inspire others to come up with better ideas.

This way of working also means that we don't offer any production guarantees, and recommend to use Locutus inspiration and learning purposes only.

Examples

Please note that these examples are distilled from test cases that automatically verify our functions still work correctly. This could explain some quirky ones.

#codeexpected result
1boolval(true)true
2boolval(false)false
3boolval(0)false
4boolval(0.0)false
5boolval('')false
6boolval('0')false
7boolval([])false
8boolval('')false
9boolval(null)false
10boolval(undefined)false
11boolval('true')true

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