Match a procedure

General
1

hello,

how can i match against a procedure,example:

(match (list container index1-or-keyword
       ((list c /)  "something with /")
       ((list c p) "else")

it will put index1-or-keyword in / and that not what i want, i just want it to check that index1-or-keyword is /

if i quote index1-or-keyword and / it will match but if i have an expression in index1-or-keyword it will not be evaluated and cause error after in code.

Damien

2

Use ==.

(match (list container index1-or-keyword)
  [(list c (== /))  "something with /"]
  [(list c _) "else"])
1 Like
3

thank you ,it works in my code:

(match (list container index1-or-keyword index2-or-keyword)
	      
	      ((list c (== /) (== /)) (displayln "T[/ /]"))
	      ((list c i1 (== /)) (displayln "T[i1 /]"))
	      ((list c (== /) i2) (displayln "T[/ i2]"))
	      ((list c i1 i2) (let ((value expr)) ;; to avoid compute it twice
				
				;; normal case
				(if (vector? c)
				    (function-array-n-dim-set! c value (reverse (list i1 i2))) ;;(array-n-dim-set! array value i1 i2)
				    (array-set! c i1 i2 value))
				   
				value)))

i try to find something equivalent to Guile now...

Regards,
Damien

1 Like