Syntax example scan sheet for Ruby.

ruby_up_to_speed.rb

# Ruby up to speed

# variables and const
integer_var = 10
STRING_VAR = "Hello, Ruby!"

# methods
def greet(name)
    "Hello, \#{name}!"
end

# while loop
count = 5
while count > 0
    puts "While loop iteration: \#{count}"
    count -= 1
end

# for loop using range
for i in 1..5
    puts "For loop iteration: \#{i}"
end

# each loop with array
[1, 2, 3, 4, 5].each do |num|
    puts "Each loop iteration: \#{num}"
end

# conditional statements
if integer_var > 5
    puts "Integer is greater than 5"
elsif integer_var == 5
    puts "Integer is 5"
else
    puts "Integer is less than 5"
end

# data structures
numbers = [1, 2, 3, 4, 5]  # Array
info = {'name' => 'John', 'age' => 30}  # Hash

# error handling
begin
    result = 10 / 0
rescue ZeroDivisionError
    puts "Caught a division by zero error!"
ensure
    puts "This code runs no matter what"
end

# writing to a file
File.open('example.txt', 'w') do |file|
    file.puts "Writing to a file in Ruby!"
end

# reading from a file
File.readlines('example.txt').each do |line|
    puts "File content: \#{line}"
end

# object-oriented programming
class Point
    attr_accessor :x, :y

    def initialize(x, y)
        @x = x
        @y = y
    end

    def display_point
        puts "Point: (\#{@x}, \#{@y})"
    end
end

# main execution
puts greet("Ruby User")
point = Point.new(2, 3)
point.display_point