Some basic Ruby snacks

ruby_fun.rb

# Why Ruby is Fun

# Everything is an object
5.times {|x| puts x}

# Even nil is an object
puts nil.nil?

# Yes, nil is an object
nil.methods.each {|x| puts x}

# Convenient assignment
a, b, c = 1, 2, 3

# Or even
array = ["apple", "banana", "carrot"]
a, b, c = array
puts a, b, c

# Swap 'em
a, b = b, a

# If statements can come last
puts "a is nil" if a.nil?

# Unless can be nice
puts "hello" unless a.nil?

# A Range is an object
puts (1..3)

# Range responds to each
("a".."z").each {|x| puts x}

# Each with index
"string".split("").each_with_index do |x, i|
  puts "#{i}: #{x}"
end

# Arrays
array = [50, "foot", :dog, (1..4)]
array << "another element"
puts array

# Just add 'em
puts [1, 2, 3] + [4, 5, 6]

# Or multiply!
puts [1, 2, 3] * 3

# Or flatten
puts [[1, 2, 3], ["a", "b", [:c, :d, [:e]]]].flatten

# The last element of an array
puts array[-1]

# A range of array elements
puts array[2..-1]

# You hiding something?
puts "found it!" if array.include? "foot"

# Anything at all?
puts "no elements" if array.empty?

# Flip it
puts array.reverse
puts "hello world!".reverse

# Capitalize
puts "hello world!".capitalize

# Radness
def func arg
  p = Proc.new {return arg}
  # the proc runs in this scope
  # so return returns from this scope!
  p.call
  # won't get here!
  puts "yo"
end
puts func "hi"