bool-chance

A simple wrapper around Math.random for returning a random boolean, with the provided chance of being true. It exports an object with a ::get method to facilitate stubbing for unit tests.

Usage

const boolChance = require('bool-chance');

let bool = boolChance.get(0.75); // Will return true 75% of the time.
let otherBool = boolChance.get(0.5); // Will return true half of the time.

Why

Even though this is very simple, popular utility libraries like lodash don't have a method like it. Chance.js does, but its api requires you to construct an instance of a directly exported class, which can be frustrating for unit tests since you can't stub the constructor. You can stub the Chance::Chance method to get an instance, though having to do this every time you need to test a random bool is annoying.

As a result, I found myself writing utility functions like this one in a lot of my personal projects. I figured I'd save myself some trouble and just publish it. Use if you like, though I don't really have plans to add much more to it in the future.