Lecture 5-1

COMP105 Lectures 2020-10-21

Tuples

A tuples allows us to bind two or more values together:

(1,2)
("A", "few", "words")
(6, "six")

• Tuples can have any size but must be at least 2.
• The size should be thought of as being fixed as it is not easy to change the length of a tuple.
• Tuples can mix types.

Example Functions

Taking Tuples as Input

f (x, y) = x

This will take a tuple with the elements x and y and will return the first element of the tuple.

Returning Tuples as Output

f x y = (max x y, min x y)

Syntax

f x y = x + y
g (x, y) = x + y

Both will give the same output but the recommendation is to use the Haskell method instead of always passing tuples.

Exercises

1.  exercise1 x = (x / 10, 100 * x)
   

2.  exercise2 (x, y, z) = x + y + z
   

3.  exercise3 (x, y, z) = (z, y, x)