There is an array that we will refer to as collection.
If the array has only one element, for example [5], then collection.slice(-1) will return [5].
But strangely enough, if you try collection.slice(0,-1), it will give you an empty array: [].
Have you ever wondered why this difference occurs?
Referenced from this source
Scenario 1: utilizing negative index as the first parameter (start):
"By using a negative index, you can specify an offset from the end of the sequence. For instance, slice(-1) will extract the final element in the sequence."
Scenario 2: employing negative index as the second parameter (end):
"This denotes the index of the initial element to exclude from the array that is returned."
Experiment with different configurations of parameters by clicking here.
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