CODEWITHSUNDEEP
haskell
Qwertford
Qwertford

Reputation: 1189

Can I have plus or minus when doing cases?

Could I put a case to be within a certain range or another number?

say ...

case x of
   +/- 3 -> yes

...

Would that be something Haskell should understand?

Update: In short, would i be able to match to an interval rather than a number?

Upvotes: 0

Views: 255

Answers (1)

Random Dev
Random Dev

Reputation: 52290

no but you can use abs and turn it around:

for a interval around p with radius r you can use

if abs (x-p) <= r then yes else ...

example:

Prelude> let inInterval p r x = abs (x-p) <= r
Prelude> inInterval 5 3 1
False
Prelude> inInterval 5 3 2
True
Prelude> inInterval 5 3 8
True
Prelude> inInterval 5 3 9
False

Upvotes: 5

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