ruby学习笔记(3)--语法层面的先见之明

    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine(Sum());
            Console.WriteLine(Sum(3,6));

            Console.Read();
        }

        static int Sum(params int[] nums) 
        {
            int _result = 0;
            foreach (int item in nums)
            {
                _result += item;
            }
            return _result;
        }
    }

def sum(*num)
	numSum = 0
	num.each { |i| numSum+=i }
	return numSum
end

puts sum()
puts sum(3,6)

def  sum( a, b=5 )
  a+b
end
puts sum(3,6)
puts sum(3)

List<int> lst = new List<int>() { 1, 2, 3, 4, 5 };
lst.ForEach((i) => { Console.WriteLine(i); });

(1..5).each{|x| puts x}

class Program
    {
        static void Main(string[] args)
        {
            Action<string> a = new Action<string>(HelloWorld);

            a("jimmy");

            Console.ReadKey();
        }

        static void HelloWorld(string name) 
        {
            Console.WriteLine("hello,{0}", name);
        }
    }    

def action(method,name) #相当于c#中的action声明部分
	method.call(name)
end

helloWorld = proc{|name| puts "hello,#{name}"} #被action调用的方法体

action(helloWorld,"jimmy"); #通过action，调用helloWorld方法，输出 hello,jimmy

  class Program
    {
        static void Main(string[] args)
        {
            int[] arr = new int[] { 1, 2, 3, 4, 5 };
            arr.NewMethod();
            Console.ReadKey();
        }

        
    }

    public static class ExtendUtils 
    {
        public static void NewMethod(this Array arr)
        {
            foreach (var item in arr)
            {
                Console.WriteLine(item);
            }
        }
    }

class Array
	def NewMethod
		for i in 0...size
			yield(self[i])
		end
	end
end

arr = [1,2,3,4,5]

arr.NewMethod{|x| print x ,"\n"};

puts "*******************************"
arr.NewMethod{|x| print x * x ,"\n"};