Why does the array still have a non-zero length after deletion?

Question

I have the following code that outputs the length of an array, deletes it, and then outputs the new length:

console.log($scope.adviceList.activeAdvices.lengt         


        

Answer 1

It's because delete on array element set it to undefined so the length don't change. Use splice function instead:

a = [1,2,3,4];
a.splice(2,1);
console.log(a.length);