javascript array.splice() does not remove element in the array?

Question

I have a remove[] array which has all the index positions of all the element with 0 in the data array (as below).

data array:

Retail,1,Utilities,1,Fo         


        

Answer 1

Every time you remove one, you're making any further cached indices obsolete because the array from that point forward is reindexed.

As a result, you're removing the wrong items after the first.

You should iterate the remove array in reverse instead.

var i = remove.length;
while (i--) {
    if (remove[i] != undefined)
        options.series[0].data.splice(remove[i],1);
}   

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Additionally, you can improve the performance and get rid of the undefined test if you simply .push() each index into the remove array...

remove.push(index);