5. List comprehensions

Question 1

Describe the syntax of a comprehension

Answer 1

> [x^2 | x <- [1..5], x mod 2 == 0]
x^2 is the result format
x <- says x is drawn from within a specific range
x mod 2 == 0 is the guard of the comprehension

Question 2

How to produce a new list by pairing successive elements?

Answer 2

> zip [‘a’, ‘b’, ‘c’] [1,2,3]
[(‘a’, 1), (‘b’, 2), (‘c’, 3)]