ƒ produces an equivalent fn form. The characters between ƒ and . are
positional arguments. Single alphabetic letters are named arguments, while _
indicates that the positional argument is ignored. The body of the function is
the next entire expression after ., which itself may be another ƒ
expression.
Syntax
ƒ⟨chars⟩.⟨expr⟩
⟨chars⟩ may be empty. When it is present, it is a sequence of underscores or
non-repeated alphabetic characters. The underscore character may be repeated.
This character may be entered in the mine editor by typing Ctrl+\ fn.
Semantics
ƒx.xis equivalent to(fn (x) x).ƒ.xis equivalent to(fn () x).ƒxy.(+ x y)is equivalent to(fn (x y) (+ x y)).ƒx.ƒy.(+ x y)is equivalent to(fn (x) (fn (y) (+ x y))).ƒ_x_.xis equivalent to(fn (_ x _) x).
The shorthand is available in Coalton source, including .ct files.
Example
(map ƒx.(+ x 2) [1 2 3])