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Id
19417361
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0
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1
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2013-10-17T02:42:23.370
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2013-10-17T02:42:23.370
LastEditDate
2017-05-23T12:10:58.367
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19417065
PostTypeId
2
Score
2
ViewCount
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LastEditorDisplayName
text
Body
It will be <code>Particle.Velocity.X</code>. Not specifically because of the scope of <code>this</code> but because you did this: <pre><code>this.Velocity = new Vector(0,0,0); </code></pre> You're assigning to the <code>Velocity</code> property of the <code>Particle</code> object. But <code>this</code> works differently in javascript so it's worth spending some time understanding it. It's not bound directly to the object where it's declared/written but rather bound at run time to different things depending on how the function/method is called. For example, consider the following: <pre><code>var foo = {}; foo.name = 'Frank'; foo.say = function () {alert('My name is' + this.name)} foo.say(); </code></pre> as you would expect, the code above alerts "My name is Frank". But, if you do this: <pre><code>var bar = {}; bar.name = 'Benny'; bar.say = foo.say; bar.say(); </code></pre> the code above will alert "My name is Benny". That's because <code>this</code> is bound to the last word/name before the dot. So even if the function was originally declared in the context of <code>foo</code>, once it's called with <code>bar</code> as it's container object the <code>this</code> inside it will refer to <code>bar</code>. For a complete description of how <code>this</code> works in javascript see my answer to this other question: <a href="https://stackoverflow.com/questions/13441307/how-does-the-this-keyword-in-javascript-act-within-an-object-literal/13441628#13441628">How does the "this" keyword in Javascript act within an object literal?</a>
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1. POConstructors and Subproperties in Javascript
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1. USslebetman
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1. POConstructors and Subproperties in Javascript
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1. COGreat to know that JavaScript isn't too illogical.
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