same as method, but it can be assign or set like a variable

lambda-and-proc-in-ruby.rb

print "Enter value Integer = "
int = gets.chomp.to_i
print "Enter value string = "
string = gets.chomp.to_s

def n_times(thing)
  lambda {
    |n|
    thing * n
  }
end

p1 = n_times(int)
puts p1.call(3)
p2 = n_times(string)
puts p2.call(3)

def power_proc_generator
  value = 2
  lambda { value += value }
end
power_proc = power_proc_generator
power_proc.call

int.times do
  p power_proc.call
end

puts "--- Space"
puts

tinggi_badan = [170, 160, 150]
tinggi_badan.each {
  |tinggi|
  puts "Tinggi badanku #{tinggi}cm."
}

puts; puts "This is block"
blok = proc {
  |tinggi|
  puts "Tinggi badanku #{tinggi}cm."
}

tinggi_badan.each &blok


puts; puts "--- lambda"
ld = lambda {
  |tinggi|
  puts "Tinggi badanku #{tinggi}cm."
}
#
#p ld.class
puts "lambda merupakan sebuah instance dari { #{ld.class} }."
puts ld.lambda?
tinggi_badan.each &ld
puts

# make method with an argument PROC

def kelas_blok(&block)
  puts "method with argument a PROC #{block.class}"
  puts "is a block lambda .? #{block.lambda?}"
end

puts kelas_blok {
  |tinggi|
  puts "Tinggi badanku dengan method argument PROC #{tinggi}cm."
}
puts kelas_blok &(lambda {
  |tinggi|
  puts "Tinggi badanku with another #{tinggi}cm."
  })
#
puts kelas_blok &->(tinggi) {
  puts "Tinggi badanku #{tinggi}cm."
}