precedence

Precedence AND and OR operations for JavaScript.

The problem

Since "", 0, NaN, and so on, are considered falsy on expression evaluations, sometimes you might get unexpected results.

Example:

var value = false || 0 || "" || NaN || 5
console.log(value)
// => 5

But, wait, 0 should've been considered a valid value, shouldn't it? WTF JS TYPES

Usage

precedence tackles this problem by considering only undefined, null, and false as falsy.

OR:

var or = require('precedence').or
console.log(or(null, false, undefined, 5, 10)) // => 5
console.log(or(null, "0", 5)) // => "0"
console.log(or(null, 0, 5)) // => 0

AND:

var and = require('precedence').and
console.log(and(null, false, undefined, 5, 10)) // => false
console.log(and(null, "0", 5)) // => false
console.log(and(null, 0, 5)) // => false
console.log(and(0, false)) // => false

License

MIT