CODEWITHSUNDEEP
listrandomschemeracket
Smurfffy
Smurfffy

Reputation: 197

Getting items from a list in Racket

I am wondering if in Racket I could get n number of items from a list I've already created. So lets say I made a list in Racket

(define base(list 1 2 3 4 5 6 7 8 9 10))

Now I want to define a function which will pick n number of items from this list and display them in a new list. So lets say n=4 I would want 4 random items from the base list I've made above. An example of the output im looking for would be

'(9 4 3 10)

Is there a way I can do this in Racket?

Upvotes: 1

Views: 324

Answers (1)

Óscar López
Óscar López

Reputation: 236122

There are built-in procedures that literally do what you need: shuffling the list and taking n elements from it. Try this:

(define (take-n-random lst n)
  (take (shuffle lst) n))

(define base (list 1 2 3 4 5 6 7 8 9 10))
(take-n-random base 4)

=> '(6 9 1 7)

Upvotes: 1

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