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PORemove an arbitrary element from a JavaScript array
 

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    <p>In my Google Maps application I can place markers on the map, and I keep a reference to each of the markers placed, along with some extra information in an array called <code>markers</code>.</p> <p>Adding markers is easy, I just <code>push()</code> the newly created object onto the array (<code>markers.push(marker)</code>);</p> <p>However, when it comes to removing an arbitrary marker from the array, given an index of the slot, it doesn't behave as expected. My function is:</p> <pre><code>function deleteMarker(markerIndex) { if (markerIndex!='' &amp;&amp; markerIndex&gt;=0 &amp;&amp; markerIndex&lt;markers.length) { if (confirm('Do you really want to remove this marker from the map?')) { alert('deleting marker '+markerIndex); //debugging purposes markers.splice (markerIndex, 1); } } } </code></pre> <p>I have no previous experience with the splice() function, but looking at <a href="http://www.w3schools.com/jsref/jsref_splice.asp" rel="nofollow noreferrer">its description @ w3schools</a> it seems to be pretty straight-forward. However, I get the following behaviour:</p> <p><code>markers.splice()</code> does nothing. So what am I doing wrong?</p> <p>And also, when <code>markerIndex</code> is 0 no confirmation box is shown. At first I assumed the lengthy if-condition evaluated to false and so the whole code block was skipped, however, using Firebug to step through the calls I found out that the condition holds (of course) for index 0 when array is non-empty, next step reveals that the <code>if (confirm(...))</code> and <code>alert('deleting...)</code> are <em>skipped</em> and <code>markers.splice()</code> is called (but nothing happens). This behaviour is so strange I decided to open this question.</p> <p><em>Can anyone please clarify what's going on?</em></p> <p>I thought that deleting markers will be the easiest bit of functionality one could do. I can add them, edit their contents, even <em>clear all markers</em> (<code>pop()</code>-ing markers off the <code>markers</code> array until empty) and all works nicely.</p>
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