What Does [,] means? Class Constructor

Questions & Answers
1

Im following a tutorial in youtube and i noticed something,what does [,] means?

The class constructor :

using UnityEngine;
using System.Collections;

public class Node {

	public Vector3 worldpoint;
	public bool walkable;
	public Node parent;

	public int hcost,gcost;
	public int gridX,gridY;

	public Node(Vector3 _worldpoint,bool _walkable,int _gridX,int _gridY)
	{
		worldpoint = _worldpoint;
		walkable = _walkable;
		gridX = _gridX;
		gridY = _gridY;
	}
	public int fCost
	{
		get
		{
			return hcost + gcost;
		}
	}
}

The using of the class constructor :

using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public class Grid : MonoBehaviour {

    Node[,] grid;
}
2

It’s a multidimensional array. You can think of it like a grid in this case. If the grid was initialized as:

Node[,] grid = new Node[10, 5];

The grid would be 10 by 5.

check out the MSDN documentation on arrays:

4

It means multidimensional array. Also known as a matrix.

The case in your description creates an array of two dimensions. Every row will have the same number of columns. As opposed to a jagged array, Node[][] grid, which could have a different number of columns in each row.

3

It’s a 2D array of type Node.

Read: Multidimensional Arrays (C# Programming Guide)