CODEWITHSUNDEEP
ocaml
kefkemfekm
kefkemfekm

Reputation: 43

pattern matching on two arguments in ocaml

I am trying to figure out how to match on two arguments in ocaml.

I have a function that takes in two tuples:

let time a b = ...;;
time (34, 4)(5, 6);; // function call

How can I access, say, the first item in the first tuple and add it with the first item in the second tuple? Thanks!

Upvotes: 0

Views: 584

Answers (2)

Chris
Chris

Reputation: 36680

In addition to the answer from @glennsl, you may find as useful.

let time (a', _ as a) (b', _ as b) = 
  (* ... *)

This lets you destructure both tuples, but also bind a name to each tuple.

Upvotes: 2

glennsl
glennsl

Reputation: 29146

let time (a, _) (b, _) = a + b;;

or, to destructure any binding outside of function arguments:

let time a b = 
  let a', _ = a in
  let b', _ = b in
  a' + b'

In general you'll find that most patterns look exactly like how you'd construct the value. Pretty handy that way.

Upvotes: 4

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