.ruby-version

2.0.0-p0

kwargs.rb

require 'pp'

def r
  begin
    yield
  rescue => e
    puts
    pp e
  end
end

def none
  puts
  puts "called with no arguments"
end

none

def one(x)
  puts
  print "called with: "
  pp x
end

one "hello"

def two(x, y)
  one x
  print "and "
  pp y
end

two "hello", "goodbye"

def kw(x, y: "default y")
  one x
  print "and y="
  pp y
end
  
kw "hello", y: "hasta la vista"

r { kw "oops" }

r { kw "hello", "friends" }

r { kw an: 'implicit hash', y: 'because' } 

def opt(x, y="optional")
  one x
  print "optional keyword is "
  pp y
end

opt "okay"
opt "okay", "computer"
opt "okay", lets: 'do it'

def example(id, order: 'id asc', where: {}, limit: 1)
  puts
  puts "hypothetical activerecord!"
  puts "id: #{id.inspect}, order: #{order.inspect},"
  puts "where: #{where.inspect}, limit: #{limit.inspect}"
end

example 5
example :all, order: 'name desc'
example :all, limit: 100