Besides the documentation procedure, this module exports three routines, the macros pipe and pipe* as well as the procedure flip*. The first macro takes a variable and a sequence of partial combinations, calls the first combination with the variable as additional left argument and hands the result successively to the next combination. For example
(pipe 3 (+ 1) (- 2) (* 5))
will return 10.
Sometimes its necessary to add the variable to the right of the argument list. To achieve this simply replace the combination's name, fn say, with (flip* fn): flip* flips the first argument of fn to the end, and thus is a generalisation of flip in (chicken base).
- pipes symprocedure
documentation procedure: the first call shows the list of exported symbols, the second the documentation of sym.
- (pipe x (fn . xs) ...)syntax
calls each combination with the result of applying its combination to the left as first argument. In particular (pipe x (fn . xs)) is (fn x . xs) and (pipe x (fn . xs) (gn . ys)) is (gn (fn x . xs)).
- (pipe* (fn . xs) ...)syntax
pipe as a procedure: (pipe* (fn . xs) ...) is (lambda (x) (pipe x (fn . xs) ...))
- flip* procprocedure
flips the arguments of proc by shifting the first one to the end.
((flip* list)) ; -> '() ((flip* list) 1) ; -> '(1) ((flip* list) 1 2) ; -> '(2 1) ((flip* list) 1 2 3 4) ; -> '(2 3 4 1) ((flip* map) '(0 1 2) add1) ; -> '(1 2 3) (pipe 5) ; -> 5 (pipe 5 (+ 1)) ; -> 6 (pipe 5 (- 10) (positive?)) ; -> #f (pipe 5 (- 10) (negative?)) ; -> #t (pipe 10 ((flip* list) 1 2 3 4)) ; -> '(1 2 3 4 10) (pipe 10 (list 1 2 3 4)) ; -> '(10 1 2 3 4)) (pipe '(0 1 2) ((flip* map) add1)) ; -> '(1 2 3)) (pipe 0 (list 1 2 3)) ; - > '(0 1 2 3)) (pipe 0 ((flip* list) 1 2 3)) ; - > '(1 2 3 0))
Mar 28, 2019
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- initial import