Data Types

Data types represent different types of data such as numbers, booleans, strings, etc. As an object-oriented language, all data types are based on classes.


Ruby has different types of numbers such as integers and floating point numbers.

# Integer type
count = 1
# Float type
rating = 1.5
# Both float and integer types
miles = 127
hours = 2.5
miles_per_hour = miles / hours
puts "Miles per hour: #{miles_per_hour}"
# Output: Miles per hour: 50.8


A value of either true or false.

temp = 100
isHot = temp > 80
puts isHot
# Output: true
if isHot
puts "Better wear shorts today!"
puts "Better wear long pants today!"
# Output: Better wear shorts today!


A string is a sequence of characters that represents a word or a sentence. They are created by surrounding a sequence of characters with single or double quotes.

puts "Hello World!"
puts 'Hello World!'


Arrays store data in a list. An array can contain any type of data. Values are comma separated and enclosed in square brackets. Positions in the array start at 0.

mixed_array = [true, 2, "three", 4.0]
puts "The first element is: #{mixed_array[0]}"
# Output: The first element is: true


A collection of key-value pairs enclosed within curly braces. Values are assigned to keys using the => syntax.

person = {
first_name: "Kara",
last_name: "Brennan",
age: 29
puts "#{person[:first_name]} #{person[:last_name]} is #{person[:age]} years old."
# Output: Kara Brennan is 29 years old.


Symbols are a unique data type in Ruby. They are similar to strings except that they take up less memory and have better performance. Symbols are created by using the : syntax.

basketball_team = {:center => "Shaquille O'Neal", :forward => "LeBron James", :guard => "Steph Curry"}
puts basketball_team[:center]
# Output: Shaquille O'Neal
puts basketball_team[:forward]
# Output: LeBron James
puts basketball_team[:guard]
# Output: Steph Curry
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