Ruby/Arrays Hashes Ranges3

As I did for arrays, here are a few very useful methods that you can use:

How to check if a hash is empty:

pizza.empty?

How to check how many keys are inside the hash:

pizza.size

Get all keys inside the hash in the form of an array

pizza.keys

Get all values assigned to keys in the form of an array (not necessarily in the order they've been entered in the hash)

pizza.values

Ranges are series of numbers.

Here's how you can define a range:

myrange = 1..10

Myrange will now hold all numbers between 1 and 10 including.Myrange effectively turns into an array.

2nd way of defining a range:

myrange2 = 1...10

Myrange2 will hold all numbers between 1 and 10 except the last number : 10.

As I did with the previously discussed arrays and hashes, here are a few useful methods you can use on ranges.

How to find out the lowest number in a certain range:

puts myrange.min

How to find out the highest number in a certain range:

puts myrange.max

How to check if a number is part of a certain range:

myrange.include? (11)

Displaying a range's contents:

puts myrange.to_a