Groovy中的闭包组合

Posted 2021-02-26

Clojsure composition in Groovy (functional style programing).
@http://www.ibm.com/developerworks/java/library/j-pg08235/index.html

def multiply = { x, y -> return x * y }    
// closure
def triple = multiply.curry(3)            
// triple = { y -> return 3 * y }
def quadruple = multiply.curry(4) 
// quadruple = { y -> return 4 * y }
def composition = { f, g, x -> return f(g(x)) }
def twelveTimes = composition.curry(triple, quadruple)
def threeDozen = twelveTimes(3)
println "threeDozen: ${threeDozen}"		 
// threeDozen: 36