Underscore placeholders for convenient closure syntax
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Updated Last
8 Months Ago
Started In
March 2020


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Underscores provides a macro @_ for passing closures to functions by interpreting _ placeholders as anonymous function arguments. For example @_ map(_+1, xs) means map(x->x+1, xs).

Underscores is useful for writing anonymous functions succinctly and without naming the arguments. This is particular useful for data processing pipelines such as

@_ people |> filter(_.age > 40, __) |> map(_.name, __)

Read the documentation for more information, or see the online help for the @_ macro.

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