Pattern Matching in F#

Here you will learn about Pattern Matching in FSharp.

Introduction

Pattern matching allows us to make different computation depending on matching pattern. It is very similar to Switch statement in c and c++. Its syntax is given below.

match exp with
| pattern1 -> result
| pattern2 -> result
|------------------
|------------------
| _ -> default

Now we write the code for getting day name by passing day number. Like following code.

let week n =
  match n with
 
  | 1 -> "Monday"
  | 2 -> "Tuesday"
  | 3 -> "Wednesday"
  | 4 -> "Thursday"
  | 5 -> "Friday"
  | 6 -> "Saturday"
  | 7 -> "Sunday"
  | _-> "Wrong Input"

printfn "%s" (week 1)
printfn "%s" (week 2)
printfn "%s" (week 5)

printfn "%s" (week 9)

Output: