Convert data types to boolean.

This is a very basic utility library to help convert the basic JS data types to boolean. Each type is treated differently:

• Boolean is returned as-is
• Function is assumed to be true
• Number is true for greater-or-less-than 0
• Object is just cast to boolean (!!), which works for null (as typeof null === "object")
• String is converted to lower-case and compared to "true" or "1"
• Symbol is currently treated as always-true
• Undefined is always false

If none of these types match the passed item, a TypeError is thrown.

Usage is super easy:

var toBool = require("to-bool");

if (toBool(someVariable)) {
	console.log("It's true.");
}