CODEWITHSUNDEEP
schemelispracket
radious
radious

Reputation: 830

How to filter out false values from the list in racket

I'm learning Racket (but probably answer will be similar in any Scheme and scheme-derived language) and wonder how to filter out false (#f) values from a given list. The best I came up with is:

(filter (lambda (x)
           (not (eq? x #false)))
        '("a" "b" #f 1 #f "c" 3 #f))

'("a" "b" 1 "c" 3) ;; output

However, I guess there has to be a simpler solution.

Upvotes: 8

Views: 1628

Answers (1)

vukung
vukung

Reputation: 1884

You can just do

(filter identity '("a" "b" #f 1 #f "c" 3 #f))

as anything not #f is considered true.

Upvotes: 12

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