Truth table (JavaScript)

truth_table.js

/* js-truth_table
 *
 * file: truth_table.js
 *
 * Copyright (c) 2011, Erik Nordstroem <contact@erikano.net>
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 */

var row = [], values = ["a", "b", "c"]

for (var i = (Math.pow(2, values.length) - 1) ; i >= 0 ; i--) {
  for (var j = (values.length - 1) ; j >= 0 ; j--) {
    row[j] = (i & Math.pow(2,j)) ? true : false
  }
  print(row)
}

Output:

true,true,true
false,true,true
true,false,true
false,false,true
true,true,false
false,true,false
true,false,false
false,false,false

Obviously, you'll want to pass each row to a function (probably along with the original values) and do something more useful than just printing it.

You have to keep in check if Math.pow(2, n) doesn't exceed the maximum safe integer value.