Ruby - Curry examples

curry.rb

##
# Simple closure
##

power = -> (x, n) { x**n }.curry #=> #<Proc:0x00556a913f6af0 (lambda)>

power_of_two = power.(2) #=> #<Proc:0x00556a913f2d38 (lambda)>
power_of_two.(10) #=> 1024

power_of_ten = power.(10) #=> #<Proc:0x00556a913e03b8 (lambda)>
power_of_ten.(3) #=> 1000

##
# Closure with more granular compositions
##

f = -> (a, b, c) {  a + b + c }.curry 

# Combine "a" with multiple "b" and "c"s:

f_a = f.(1)
f_a.(2, 3) #=> 6
f_a.(3, 9) #=> 13

# Combine "a" and "b" with multiple "c"s:

f_a_b = f.(1).(2) #=> 6
f_a_b.(7) #=> 10

##
# Pipe example:
##

foo = -> a, b, c {
 c.(b.(a))
}.curry

foo.("foo")
  .(-> (str) { str.upcase })
  .(-> (str) { str << "bar"}) #=> "FOObar"