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This is documentation for the next version of Alloy. For the latest stable release, go to the latest version.

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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(sys.env("DOES_NOT_EXIST"), "c")
c