闭包

def clouser = { name -> println "hell ${name}" }
clouser.call() //hell null
clouser.call("groovy") //hell groovy
clouser("groovy") //hell groovy


def clouser2 = { String name, int age -> println "hell ${name}, age is ${age}" }
clouser2.call("cjt", 28) //hell cjt, age is 28
clouser2("cjt", 28) //hell cjt, age is 28

//默认参数it
def cjt = { println "hell ${it}" }
cjt("吉米")

//求阶乘
int fab(int number) {
    int result = 1;
    1.upto(number, { num -> result *= num })
    //1.upto(number) { num -> result *= num }
    return result
}

println fab(5)

int fab2(int number) {
    int result = 1;
    number.downto(1) { num -> result *= num }
    return result
}
println fab2(5)

int cal(int number) {
    int result = 0;
    number.times { num -> result += num }
    return result
}
println cal(101)

10.times {
    print it + "  " //输出0 - 9
}