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POReferences with variables in Javascript
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Id
15468836
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AcceptedAnswerId
15468908
AnswerCount
3
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CommentCount
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CreationDate
2013-03-18T02:20:53.003
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0
LastActivityDate
2013-03-24T13:01:36.793
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2013-03-24T13:01:36.793
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text
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I was pondering something earlier. I wanted to check if a function had already been put into an array. If so throw an exception. I did this little test with the console... <img src="https://i.stack.imgur.com/57xcs.png" alt="enter image description here"> So I guess I could say that the objects are always just references, and after setting <code>a</code> as <code>x</code> I could change <code>x</code> and <code>a</code> would be effected as well? Would this mean that the condition <code>x = a</code> no matter what, which is what I want. Using this to check if the function/object is already in the array I could just do this correct... <img src="https://i.stack.imgur.com/uBV5u.png" alt="enter image description here"> Is there a better way to do this? Would this also mean that if I pass a variable to a function and mutate it in that function it will be mutated outside of that function as well? EDIT I guess I am right about the mutation with this little test. But I don't get why its bar in the first log in the second example <img src="https://i.stack.imgur.com/zK5sl.png" alt="enter image description here"> <img src="https://i.stack.imgur.com/ZQ1fx.png" alt="enter image description here"> EDIT END Example 1: <pre><code>var x = function(){console.log("hello")}; var a = function(){console.log("hello")}; console.log(x == a); //comes out false //Set a as x a = x; console.log(x == a); //comes out true </code></pre> Example 2: <pre><code>Array.prototype.Contains = Array.prototype.Contains || function (obj) { return this.indexOf(obj) != -1; }; var x = function(){console.log("hello")}; var a = function(){console.log("hello")}; var z = a; console.log(x == a); //comes out false var l = []; l.push(x); //Set a as x a = x; l.push(a); console.log(x == a); //comes out true console.log(l.Contains(x)); //Should come out true console.log(l.Contains(a)); //Should come out true console.log(l.Contains(z)); //Should come out false </code></pre>
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<javascript><variables><reference>
Title
References with variables in Javascript
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1. PO
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1. USDaniel Imms
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1. USFabianCook
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1. PO
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