Haskell CW II.5

Opener

The removeOne function takes in a single number and a list of numbers. It removes one copy of the number from the list of numbers.

roce = [
  removeOne 5 [1,2,3] == [1,2,3]
  ,removeOne 5 [1,2,5,4] == [1,2,4]
  ,removeOne 9 [9,1,9,2,9] == [1,9,2,9]
  ]

• Write the type signature for removeOne.
• Write the function.

removeAll

Write a function that removes all of the copies of a given number from a list.

race = [
  removeAll 5 [1,2,5,4] == [1,2,4]
  ,removeAll 9 [9,1,9,2,9] == [1,2]
  ,removeAll 9 [9] == []
  ]

Homework 1

The count doubles function takes in a list of Integers and puts out a count of the number of times a x in the original list appears adjacent to another x.

Examples:

cdce = [
   countDouble [1,1,2,2,3,3] == 3
  ,countDouble [4,4,4] == 2
  ,countDouble [0,0,0,0,0,10,10,10] == 6
  ]

• Write a type signature for countDouble.
• Write the function.