if

myif.rb

def myif(b, then_block, else_block)
    h = Hash.new(then_block)
    h[false] = else_block
    h[nil] = else_block

    return h[b].call()
end

def mythen(&block)
    return block
end

def myelse(&block)
    return block
end


puts
puts "true"
puts "----"

myif true, mythen {
    puts "hello world"
    puts "hello world"
}, myelse {
    puts "hello ruby"
}

puts
puts "false"
puts "-----"

myif false, mythen {
    puts "hello world"
    puts "hello world"
}, myelse {
    puts "hello ruby"
}