typecheck: Better alternative to JavaScript's typeof operator

typecheck.js

// Uber typeof:
// Since null, in JavaScript, is an object with an unknown value,
// typeof null == 'object' is technically correct.
// Nevertheless, JavaScript's typeof operator could be much more helpful
// than it is.
function typecheck (obj) {
	var type;
	
	// faster than if/else
	switch (obj) {
	case undefined:
		type = 'undefined';
		break;
	case null:
		type = 'null';
		break;
	default:
		var m  = (obj.constructor + '').match(/function\s+([a-z_$][0-9a-z_$]*)/i);
		if (m == null) {
			type = typeof obj;
		} else if (m.length > 0) {
			type = m[1].toLowerCase();
		} else {
			type = typeof obj;
		}
	}
	
	return type;
};

var toType = function (obj) {
  return ({}).toString.call(obj).match(/\s([a-zA-Z]+)/)[1].toLowerCase();
}

var toType = function (obj) {
  return ({}).toString.call(obj).match(/\s([a-zA-Z]+)/)[1].toLowerCase();
}

Nice @elijah629 👌