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POwhich approach is best to search object in array?
 

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  1. POwhich approach is best to search object in array?
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    <p>I've sorted following ways to search for an object in array. This question has been asked like countless times but I want to know which of the best from following ways. If there's another I'd like to know that too.</p> <p><strong>Using <code>$.grep()</code></strong></p> <pre><code>function is_in_array(arr,element){ var result = $.grep(arr, function(e){ return e.id == element; }); return result.length; } </code></pre> <p>Above function returns length of array.</p> <ul> <li>0 when element not present</li> <li>1 when element present</li> <li>length > 1 if more elements with same value present</li> </ul> <p><strong>using lookup object</strong></p> <pre><code>var lookup = {}; for (var i = 0, len = array.length; i &lt; len; i++) { lookup[array[i].id] = array[i]; } </code></pre> <p>This way I don't need to traverse entire array each time. I'd just check for <code>lookup[id]</code> instead.</p> <p><strong>for loop in traditional way</strong></p> <pre><code>function in_array(array, id) { for(var i=0;i&lt;array.length;i++) { if(array[i].id === id) { return true; } } return false; } </code></pre> <p>to check if element exists, i'd call <code>in_array(arr,element)</code>.</p> <p>Which approach is best ? Question seriously sounds duplicate and it is but I just want to make sure which is best from these three only.</p> <p><strong>Update</strong></p> <p>Array will contain objects like --</p> <pre><code>var arr = []; var nameObj = {}; nameObj.label = "somename"; nameObj.id = 123; arr.push(nameObj); . . . </code></pre>
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    1. USfedorqui
    1. USGimali
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    1. COthe lookup is the fastest to execute more than once.
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      1. POwhich approach is best to search object in array?
      1. USdandavis
    2. COiterate the array with a for loop, and do `return key in array[i]`
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      1. POwhich approach is best to search object in array?
      1. USadeneo
    3. CO@adeneo- that only checks presence, not values, it hits inhered props, and it's slow to do a loop-de-loop when just a loop will work.
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      1. POwhich approach is best to search object in array?
      1. USdandavis
 

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