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Discussion on: Validate a Credit Card Number with Functional JavaScript

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emnudge profile image
EmNudge

Protip:
You can reference the end of an array by using negative integers.
i.e.
Instead of .slice(0, len - 1) you can do .slice(0, -1)

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deciduously profile image
Ben Lovy Author

Ooh, thanks! Much nicer. JS is definitely not in my muscle memory yet.

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