ISBN Checker

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Your task is to create a function that takes in an ISBN code as a string (with or without the hyphens should be accepted - e.g. "978-1-108-70039-9" or "9781108700399") and returns a Boolean value, for whether the ISBN number is valid or not

Here is a YouTube video from someone explaining how to calculate an ISBN check digit. The process is very simple.

Examples:

978-1-108-70039-9 returns true

978-1-108-70039-8 returns false

Extension:

If the provided ISBN is invalid, output to the user a "did you mean?" message showing them what the correct check digit for that particular ISBN number they entered is

Solutions

IGCSE 0478 / O-Level 2210 A-Level 9618