Why does Array.splice(-1,1) remove last element in Javascript? [closed]

Question

I was trying to remove certain elements based on their index in array. example:

var x = ["a","b","c"];

and trying to do

x.splice(x.indexOf("d"),1)

Since this turns out to be x.splice(-1,1) - it's ending up removing the element "c" from the array!

unable to understand why this is happening even though there is no cyclic property for Arrays in javascript.

Answer 1

From the MDN page for splice:

If negative, will begin that many elements from the end.

So x.splice(-1, 1) starts one element from the end of x and deletes a single element.