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POHow to give a specific context to a JavaScript function without invoking it right away
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13767952
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0
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3
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4
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CreationDate
2012-12-07T17:21:10.717
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0
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2012-12-08T18:53:39.150
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2012-12-08T18:48:02.327
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1027004
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1027004
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1
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0
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81
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text
Body
I'd like to create an object with some hidden (using closures) variables, and methods that utilize those hidden variables. I don't however want to recreate those methods for each instantiation. I'd like to have them in memory once. I'm using plain functions to instantiate objects. Here's some code: <pre><code>function Mario () { var mario = {}; // create the obj mario.name = "Mario"; // create a property on it mario.hp = (function () { // set up a closure var currentHp = Mario.baseHp * 100; // create a "hidden" variable return function (value) { // return the hp function that utilizes the hidden currentHp variable if (!!value) { return currentHp = ((currentHp * Mario.baseHp) + value); } return currentHp * Mario.baseHp; }; }()); return mario; // send along the newly created object } Mario.baseHp = 1; var mario = Mario(); log(mario); log(mario.hp()); log(mario.hp(-20)); log(mario.hp()); </code></pre> The problem here is that every time I create another "mario" object, I've created the hp function again in memory. Here's my attempt at a solution so far: <pre><code>function Mario () { var mario = {}; // create the obj mario.name = "Mario"; // create a property on it mario.hp = (function () { // set up a closure var currentHp = Mario.baseHp * 100; // create a "hidden" variable return Mario.hp; // reference the hp function below..... but the context is wrong, it needs access to currentHp variable. }()); return mario; // send along the newly created object. } Mario.baseHp = 1; Mario.hp = function (value) { // Create the hp function once in memory if (!!value) { return currentHp = ((currentHp * Mario.baseHp) + value); } return currentHp * Mario.baseHp; }; var mario = Mario(); log(mario); log(mario.hp()); log(mario.hp(-20)); log(mario.hp()); </code></pre> But obviously the context of Mario.hp is wrong. I'm thinking there might be a way to use call or apply that would resolve this. Any help would rock!
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<javascript><oop><closures>
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How to give a specific context to a JavaScript function without invoking it right away
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