Javascript Array Difference Method. The second parameter 0 defines how many elements. The advantage of this method is if you want to derive a single boolean value from multiple elements in an array.
These two different statements both create a new array containing 6 numbers. The second parameter 0 defines how many elements. It returns a ture for pass and flase for fail.
For example the difference between arrays 1 2 3 4 and 3 4 5 is 1 2.
Var array second 3 4 5 6. The second parameter 0 defines how many elements should be removed. For example the difference between arrays 1 2 3 4 and 3 4 5 is 1 2. Var array first 1 1 1 2 2 2 2 3 4.
