// 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.
// 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.
if (x <= 1)
return x * factorial(x-1);