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coalesce
coalesce
takes any number of arguments and returns the first one that isn’t null, an empty string, empty list, or an empty object.
It’s useful for obtaining a default value, such as if an environment variable isn’t defined.
If no argument is non-empty or non-zero, the last argument is returned.
Examples
> coalesce("a", "b")
a
> coalesce("", "b")
b
> coalesce(env("DOES_NOT_EXIST"), "c")
c
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