// This example is from the book _JavaScript: The Definitive Guide_. // Written by David Flanagan. Copyright (c) 1996 O'Reilly & Associates. // This example is provided WITHOUT WARRANTY either expressed or implied. // You may study, use, modify, and distribute it for any purpose. // A short-cut function, sometimes useful instead of document.write() // This function has no return statement, so it returns no value. function print(msg) { document.write(msg, "
"); } // A function that computes and returns the distance between two points. function distance(x1, y1, x2, y2) { var dx = (x2 - x1); var dy = (y2 - y1); return Math.sqrt(dx*dx + dy*dy); } // A recursive function (one that calls itself) that computes factorials. // Recall that x! is the product of x and all positive integers less than it. function factorial(x) { if (x <= 1) return 1; else return x * factorial(x-1); }