In my code, I am trying to work with a sparse Array. I have written a pseudocode snippet where I use delete array[id] to remove elements and adjust the length of the array accordingly.
....
deleted = 0;
...
if (condition) { delete array[id]; deleted++;}
...
array.length -= deleted;
After running this code, the array ends up having the expected length but strangely it is empty! Can anyone shed some light on why this might be happening?
To efficiently remove an element from a sparse array, follow this recommended method:
arr.forEach(elm,index){
//delete the element at the specified index
delete arr[index]
}
By using this approach, you can successfully remove the element while maintaining the same size of the array.
If you're looking to manually handle it without worrying about the item order, this method is faster than using splice:
array[id] = array[array.length-1]; // replace target index with last item
array.pop(); // remove the last item
The length of the array will still be correct.
If preserving order is important, follow zerkms's advice and use splice
array.splice(id, 1);
The first parameter indicates the starting index, while the second parameter specifies how many items to delete.
With this method, the length of the array remains accurate as well.
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