Intro to Ruby - 01 - Numbers and Strings

Numbers.rb

1 + 1 # => 2

x = 2
x * 2 # => 4
x *= 2# => 4
x = x * 2 # => 8

pi = 3.14
pi * (5 * 5) # => 78.5

2 + 3 # => 5
2 * 3 # => 6
3 - 2 # => 1
6 / 3 # => 2

Strings.rb

s = "Hello, World!" # => "Hello, World"

a = "Hello,"
b = " World!"

a + b # => "Hello, World!"
a + " World" # => "Hello, World!"
"#{a}#{b}" # => "Hello, World"

## String Interpolation
x = 2
y = 6
new_string = "#{x} + #{y} = #{x + y}" # => "2 + 6 = 8"

## String Methods
s = "This is my string variable"
s.length # => 26
s.upcase # => "THIS IS MY STRING VARIABLE"
s.downcase # => "this is my string variable"
s.sub("string", "text") # => "This is my text variable"