Basic Functions

Question 1

What is pattern matching?

Answer 1

NOT PATTERN MATCHING:
factorial if n <= 1 then 1
else n*factorial(n-1)

PATTERN MATCHING:
factorial 0 = 1
factorial n = n * factorial(n-1)

Question 2

Int to String pattern matching

Answer 2

IntToStr :: Int -> String
IntToStr 1 = “one”
IntToStr 2 = “two”
… etc