CoffeeScript in Action by Patrick Lee

Author:Patrick Lee [Unknown]
Language: eng
Format: epub, pdf
Publisher: Manning Publications

Great, that’s a duck. Is instanceof the solution? No. What happens when you change the DuckRace constructor to admit any objects that are instanceof Duck?

class DuckRace constructor (applicants) -> @ducks = d for d in applicants when d instanceof Duck go: -> duck.walk() for duck in @ducks

The race is run. Unfortunately, one of the ducks isn’t really a duck. It was a duck, but it was turned into a snake by an evil warlock:

You tried to use a type to solve your problem (via the instanceof operator) and the result was a type error. Irony.

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