Delete an array key when it contains a string in javascript

Question

I have an array in javascript that looks like this:

arr = [\"md51234\",\"md55234\"]

I\'m trying to remove an item from this by doing:

Answer 1

You must provide the index, not the value :

delete arr[0];

Alternatively, you could also use indexOf on most browsers

delete arr[arr.indexOf("md51234")];

But note that delete doesn't make the array shorter, it just make a value undefined. Your array after having used delete is

[undefined, "md55234"]

If you want to make the array shorter, use

arr.splice(0, 1); // first parameter is index of element to remove, second one is number of elements to  remove

This makes

["md55234"]