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    <p>Use parenthesis:</p> <pre><code>var str = "foobar" + (1+i) + "other stuff"; </code></pre> <blockquote> <p>I have the same problem if I try to do the addition outside of the string and store in a variable as well, it still converts to string instead of doing addition.</p> </blockquote> <p>It should not. My guess is that you are doing something wrong there too.</p> <p><strong>Update:</strong> It seems you are converting <code>i</code> to a string somewhere in the code you did not post.</p> <p><strong>Update 2:</strong> <a href="https://developer.mozilla.org/en/JavaScript/Reference/Statements/for...in#Description" rel="nofollow">Don't use <code>for..in</code> to loop over an array</a>. Use a normal <code>for</code> loop if it is really an array:</p> <pre><code>for(var i = 0, l = imgURLArray.length; i &lt; l; i++) </code></pre> <p>But if it is an objects:</p> <p><code>for...in</code> will always set <code>i</code> as a string (as it loops over the properties of the object which are not always integers) . That means you would have to convert <code>i</code> <em>before</em> you do any addition:</p> <pre><code>... + (1 + (+i)) + ... </code></pre> <p><strong>Update 3:</strong></p> <p>You don't always have to use such an "explicit" for loop. For example, you can traverse the array in reverse order, which makes the head shorter:</p> <pre><code>for (var i = imgURLArray.length; i--; ) { str = "&lt;li photonum="+i+"&gt;" + "&lt;a&gt;"+ (1+i) + "&lt;/a&gt;" + "&lt;/li&gt;"; $("ul.selection-list").prepend(str); } </code></pre>
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    1. POHow to prevent values from being converted to strings in javascript?
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    1. USFelix Kling
    1. USFelix Kling
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    1. POHow to prevent values from being converted to strings in javascript?
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    1. CONope. Does not work.
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    2. CO@BenB.: Then please post more of your code. It works: http://jsfiddle.net/fkling/XfDwd/ I assume you are converting `i` to a string somewhere.
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    3. COposted my code.
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