CODEWITHSUNDEEP
schemeracket
localplutonium
localplutonium

Reputation: 260

How do I subtract each list element by a value, using map?

I have a list '(1 2 3 4).

I want to subtract each value in the list by a value (for example 1).

I want to return the new list '(0 1 2 3).


I'm using R5RS.

I've attempted to use map but failed.

I would rather use map over defining my own iterative or recursive algorithm.

Upvotes: 1

Views: 939

Answers (1)

molbdnilo
molbdnilo

Reputation: 66459

If you want to (- x value) with each element x, map that:

(map (lambda (x) (- x value)) data)

or you could use a curried function:

(define (subtract y) (lambda (x) (- x y)))`

(map (subtract value) data)

Upvotes: 4

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