I always see this:
(_, arg1, arg2) => some expresion
What does the underscore entail? I assume a 'we don't really mind'.
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1 Answer
This is a common idiom used to indicate an unused argument.
The convention differs slightly between communities: Erlang commonly suffixes the variable used in the function signature, Prolog adds a single differentiating character while OCaml omits all but the character itself. All are widely understood pieces of metonymy in computer programming.
