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Code Block
def numbers = [1,2,3]
assert numbers //true, as numbers in not empty
numbers = []
assert !numbers //numbers is now false, atas itnumbers is now an empty collection

Maps

Non-empty maps are coerced to true.

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Code Block
assert ('Hello World' =~ /World/) //true because matcher has at least one match

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Strings

Non-empty Strings, GStrings and CharSequences are coerced to true.

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