JavaScript spread syntax in C#

Question

Is there any implementation in C# like JavaScript's spread syntax?

var arr = new []{    "1",    "2"//... };  Console.WriteLine(...arr); 

Answer 1

There isn't a spread option. And there are reasons.

1. Properties aren't an array in C# unless you use the params keyword
2. Properties that use the param keyword would have to either:
   1. Share the same type
   2. Have a castable shared type such as double for numerics
   3. Be of type object[] (as object is the root type of everything)

However, having said that, you can get similar functionality with various language features.

Answering your example:

C#

var arr = new []{    "1",    "2"//... };  Console.WriteLine(string.Join(", ", arr)); 

The link you provide has this example:

Javascript Spread

function sum(x, y, z) {   return x + y + z; }  const numbers = [1, 2, 3];  console.log(sum(...numbers)); // expected output: 6  console.log(sum.apply(null, numbers)); 

Params In C#, with same type

public int Sum(params int[] values) {      return values.Sum(); // Using linq here shows part of why this doesn't make sense. }  var numbers = new int[] {1,2,3};  Console.WriteLine(Sum(numbers)); 

In C#, with different numeric types, using double

public int Sum(params double[] values) {      return values.Sum(); // Using linq here shows part of why this doesn't make sense. }  var numbers = new double[] {1.5, 2.0, 3.0}; // Double usually doesn't have precision issues with small whole numbers  Console.WriteLine(Sum(numbers)); 

Reflection In C#, with different numeric types, using object and reflection, this is probably the closest to what you are asking for.

using System; using System.Reflection;  namespace ReflectionExample {     class Program     {         static void Main(string[] args)         {             var paramSet = new object[] { 1, 2.0, 3L };             var mi = typeof(Program).GetMethod("Sum", BindingFlags.Public | BindingFlags.Static);             Console.WriteLine(mi.Invoke(null, paramSet));         }          public static int Sum(int x, double y, long z)         {             return x + (int)y + (int)z;         }     } }