uncertain-bool

Flow control for indeterminate booleans as plain JS objects

Use case: Your API returns booleans, but sometimes a value is unknown. You want to have a clea structure for determining unknown values, as plain JS objects.

Install

$ npm install --save uncertain-bool

Usage

var Uncertain = require('uncertain-bool')

var value = Uncertain() // => 'uncertain'
Uncertain(null) // => 'uncertain'
Uncertain(undefined) // => 'uncertain'

Uncertain.is(value) // => true
Uncertain.is(true) // => false
Uncertain.is(false) // => false
Uncertain.is(undefiend) // => false

Uncertain(null, null, true) // => true
Uncertain('true') // => true
Uncertain('false') // => true
Uncertain(0) // => false
Uncertain(null, undefined, null) // => 'uncertain'

API

Uncertain(...values) -> boolean|'uncertain'

If all of the values are null or undefined, returns 'uncertain'.

Otherwise, returns the truthy or falsy version of those values, with the exception of 'false' returned as false.

Uncertain.is(value) -> boolean

Returns whether the value is 'uncertain'.

License

MIT © Andrew Joslin