Method Function.memoize

Memoize (cache) the output of a function.

• Syntax Mixed Function.memoize(Mixed a0 ... an )
  
  Will cache the output of a function call so that later calls to the same function using the same arguments are retrieved without computation.
  
  Note that this method is somewhat experimental. If you find any errors please report them.
• Parameters

  Mixed a0 ... an

• Return value Whatever the original function is returning.
• Examples

  To cache the value for later retrieval of the function f

  // Define function f
  var f =
    function() {
      // Do whatever...
    };
  // Cache the result of computing f
  // with arguments 2 and 'hello world'
  f.memoize(2, 'hello world');

• Resources The Wikipedia entry on memoization.
• Download
  Download this function including dependencies
  Source

  Unless otherwise noted all code in the JSLab Standard Library is licensed as GPLv3. See http://www.gnu.org/licenses/gpl.html for the entire license.

  // ************************************************************************** // Copyright 2007 - 2009 Tavs Dokkedahl // Contact: http://www.jslab.dk/contact.php // // This file is part of the JSLab Standard Library (JSL) Program. // // JSL is free software; you can redistribute it and/or modify // it under the terms of the GNU General Public License as published by // the Free Software Foundation; either version 3 of the License, or // any later version. // // JSL is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // You should have received a copy of the GNU General Public License // along with this program. If not, see <http://www.gnu.org/licenses/>. // *************************************************************************** // Memoize (cache) results of a function call Function.prototype.memoize = function() { // If no calls yet if (!this.results) this.results = {}; // Convert arguments object to array var args = Array.prototype.slice.call(arguments); // If results exist if (this.results[args]) return this.results[args]; // Else compute and store result this.results[args] = this.apply(null, args); // Return result of original function return this.results[args]; };