example

JavaScript

var table =  [['x','x','x','x'],
							['x','x','x','x'],
              ['x','x','x','x'],
              ['x','x','x','x'],
              ['x','x','x','x']]


var appendRow = () => {
      var newTable = table;
      newTable.push(newTable[0])
      table = newTable

      console.log(table)

    }




var appendCol = () => {
		var newTable = table;
		newTable.forEach((element)=>{
			element.push("y")		


		})
		table = newTable;
		console.log(table);
		

		

	}

appendRow();
appendCol();