Getting the last element of an array with a split in Javascript

I\’m trying to get the last array item after doing a split on a string using javascript.

    var str =\"Watch-The-Crap-456\".split(\'-\')[this.length];
    console.log(str);​​​ 
   // want it to console log 456, now it consoles WATCH which is in array[0]

I tried doing [this.length - 1] to get me the last array item, but it gives me undefined, I know some of you might say create another variable to store the array, but it\’s interesting to see if we can keeps things shorter.

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