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  1. PO
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    <p>I'm going to maintain your current code and not optimize it.</p> <pre><code>function getClosestToZero(set) { if(0 === set.length) return null; // you are assigning the actual value to the closest variable var closest = set[0], result = 0; for(var i in set) { // you are assigning the actual value to the next variable var next = set[i]; // you are comparing the absolute values if(Math.abs(closest) &gt; Math.abs(next)) { result = i; // but you are assigning the actual value closest = next; } } // thus your return value is the actual number and not its absolute return closest; } </code></pre> <p><a href="http://jsfiddle.net/N4HLT/" rel="nofollow">http://jsfiddle.net/N4HLT/</a></p> <p>You can use the isNaN() function to test whether an entry is not a number or perhaps typeof next == "number" might be more appropriate should you not desire boolean and string numerical values for instance (e.g. "2", false will ARE numbers according to the isNaN test)</p> <p><strong>UPDATED</strong></p> <pre><code>function getClosestToZeroWithNaN(set) { var closest; if(set instanceof Array) { for(var i = 0; i &lt; set.length; i++) { var val = set[i]; if(!isNaN(val)) { val = Number(val); var absVal = Math.abs(val); if(typeof closest == 'undefined' || Math.abs(closest) &gt; absVal) { closest = val; } } } } return closest; } function getClosestToZeroOnlyNumbers(set) { var closest; if(set instanceof Array) { for(var i = 0; i &lt; set.length; i++) { var val = set[i]; if(typeof val == "number") { var absVal = Math.abs(val); if(typeof closest == 'undefined' || Math.abs(closest) &gt; absVal) { closest = val; } } } } return closest; } </code></pre> <p><a href="http://jsfiddle.net/hB2T8/" rel="nofollow">http://jsfiddle.net/hB2T8/</a> look at how NaN version treats null, false and "2.12"</p>
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    1. POnumber that should be returned is the first or last in the array
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    1. UScbayram
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    1. COthanks for your reply...but what abt this scenarios the number that should be returned is the first or last in the array undefined values in the array (or NaN, Infinity, …)\ numbers with identical absolute values (e.g. -0.01 and 0.01)
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    2. CO@user3102494 I'm confused and don't understand what that means. Do you mean that the function should return both -0.01 AND 0.01 if they are the closest to zero? Furthermore, what is meant by "the array undefined values in the array (or NaN, Infinity, …)\"?
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    3. CODo you mean that the function should return both -0.01 AND 0.01 if they are the closest to zero?...not sure what to return for this condition...what you suggest
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