Created
March 3, 2011 19:17
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Morphing JavaScript object behavior
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title class="page_title">Page Title Here</title> | |
| <link rel="stylesheet" type="text/css" href="base.css" /> | |
| <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.5.1/jquery.min.js"></script> | |
| </head> | |
| <body> | |
| <h1 class = "page_title">Page Title Here</h1> | |
| <h3>Morph an objects behavior by switching function definitions.</h3> | |
| <div id="log"></div> | |
| <script type="text/javascript" src="program.js"></script> | |
| </body> | |
| </html> | |
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| jQuery(function() { | |
| var cell=null,dead_cell=null,extend=null,live_cell=null,log=null,morphin_cell=null,pCreate=null; | |
| $(".page_title").html("Mighty morphin cell"); | |
| extend = function(dest,src) { | |
| var key = ""; | |
| for (key in src) { | |
| if (src.hasOwnProperty(key)) { | |
| dest[key] = src[key]; | |
| } | |
| } | |
| return dest; | |
| }; | |
| log = function (text) { | |
| var logp = text + '<br/>'; | |
| $('#log').append(logp); | |
| }; | |
| pCreate = function(o) { // Crockford told me to! | |
| var F = function(){}; | |
| F.prototype = o; | |
| return new F(); | |
| }; | |
| cell = new function() { | |
| var base_cell_proto=null,dead_cell_functions=null, live_cell_functions=null; | |
| base_cell_proto = { | |
| to_s: function() { | |
| var s = this.name + " "; | |
| s += this.alive() ? "Alive: " : "Dead: "; | |
| s += this.neighbor_count + " neighbors"; | |
| return s; | |
| } | |
| }; | |
| dead_cell_functions = { | |
| alive: function() {return false;}, | |
| kill: function() {}, | |
| // live_cell_functions replace dead_cell_functions | |
| revive: function() { extend(this,live_cell_functions); }, | |
| tick: function() { | |
| if (this.neighbor_count === 3) { | |
| this.revive(); | |
| } | |
| this.neighbor_count = 0; | |
| } | |
| }; | |
| live_cell_functions = { | |
| alive: function() {return true;}, | |
| // dead_cell_functions replace live_cell_functions | |
| kill: function() { extend(this,dead_cell_functions); }, | |
| revive: function() {}, | |
| tick: function() { | |
| if (!((this.neighbor_count === 2) || (this.neighbor_count === 3))) { | |
| this.kill(); | |
| } | |
| this.neighbor_count = 0; | |
| } | |
| }; | |
| return function(live,name,neighbor_count) { | |
| var cell = pCreate(base_cell_proto); | |
| if (live) { | |
| extend(cell,live_cell_functions); | |
| } else { | |
| extend(cell,dead_cell_functions); | |
| } | |
| cell.name = name; | |
| cell.neighbor_count = neighbor_count; | |
| return cell; | |
| }; | |
| }; | |
| live_cell = cell(true,"Live Cell",1); | |
| dead_cell = cell(false,"Dead Cell",2); | |
| morphin_cell = cell(true,"Morphin Cell",3); | |
| log(live_cell.to_s()); | |
| log(dead_cell.to_s()); | |
| log(morphin_cell.to_s()); | |
| morphin_cell.kill(); | |
| log(morphin_cell.to_s()); | |
| morphin_cell.revive(); | |
| log(morphin_cell.to_s()); | |
| }); |
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