vanrez-nez

function generateID() {
	return ("000000" + (Math.random()*Math.pow(36,6) << 0).toString(36)).slice(-6));
}

function generateIDFromStr() {
	var seed = str.split("").reduce(function(a,b){a=((a<<5)-a)+b.charCodeAt(0);return a&a},0);
	return ( "000000" + ( seed << 0 ).toString( 36 ) ).slice( -6 );
}

vanrez-nez

Number.prototype.clamp = function(min, max) {
  return Math.min(Math.max(this, min), max);
};

vanrez-nez

//returns the interpolated value from a and b at the given weight (from 0 to 1)
var lerp = function(a, b, w) { 
  return (1 - w) * a + w * b;
}