StackOverflow2013

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PO
primarykey
Id
12653987
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0
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0
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CommunityOwnedDate
CreationDate
2012-09-29T15:27:45.220
FavoriteCount
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LastActivityDate
2012-09-30T18:37:34.310
LastEditDate
2017-05-23T12:24:48.537
LastEditorUserId
-1
OwnerUserId
383124
ParentId
12653913
PostTypeId
2
Score
2
ViewCount
0
LastEditorDisplayName
text
Body
<p>An assignment <em>changes</em> the value that you have stored in a variable. It's not possible to get the old value back.</p> <h2>Referencing variables</h2> <p>Whenever you reference a variable – read or write to it, that is – JavaScript will travel up the <a href="https://stackoverflow.com/questions/111102/how-do-javascript-closures-work">scope</a> <a href="https://stackoverflow.com/questions/1484143/scope-chain-in-javascript">chain</a> until it finds a variable of that name, otherwise it will create it in the topmost scope: <code>window</code>, the global scope.</p> <h2>Declaring variables</h2> <p><code>var</code> declares a new variable in the current scope. If you were to prepend each assignment to <code>sample</code> with <code>var</code>, the variables would <a href="https://stackoverflow.com/questions/5373278/variable-shadowing-in-javascript">shadow</a> the outer ones. Why? Let's recall that JavaScript travels up the scope chain when you reference a variable. Obviously, it will find the ones in the nested scopes first, stopping it from looking further in parent scopes.</p> <h2>What your code essentially does</h2> <p>Keeping in mind what happens when you reference a variable, we can transform your code to this, which is semantically equivalent (i.e. it is <em>exactly</em> what your code does):</p> <pre><code>var sample = "sample1"; sample = "sample2"; sample = "sample3"; console.log(sample); </code></pre> <p>Obviously, it's going to print <code>sample3</code> and you can't magically have an old value reappear.</p>
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1. POfunctional programming the first variable value?
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