General

Question 1

MULTIPLY EACH ITEM IN A LIST BY 2

Answer 1

(1..10).map { |n| n * 2 } How does this work?

Question 2

Sum a list of numbers

Answer 2

(1..1000).inject(:+)

Explain your code.

Question 3

words = ["scala", "akka", "play framework", "sbt", "typesafe"]

tweet = "This is an example tweet talking about scala and sbt."

Which words in words is in tweet?

Answer 3

words.any? { |word| tweet.include?(word) }

Explain your code: ie, how does this work?

Question 4

Read the lines of a file into an array of strings