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Predicate atom_number/2
Availability:built-in
atom_number(?Atom, ?Number)
Realises the popular combination of atom_codes/2 and number_codes/2 to convert between atom and number (integer, float or non-integer rational) in one predicate, avoiding the intermediate list. Unlike the ISO standard number_codes/2 predicates, atom_number/2 fails silently in mode (+,-) if Atom does not represent a number.
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lasha abzianidze said (2019-03-12T00:38:26):0 upvotes 0 0 downvotes
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Note that it allows a string as its first argument but not a numeric. This behavior needs to be documented.

?- atom_number("1", X).
X = 1.