2048-addNumber.js

2048-addNumber.js

// @param 2 in format [column:int, line:int]
// @param number with default value 2
const addNumber = (board, [columnIndex, lineIndex], number=2) => {
  const line = board[columnIndex]; // Get line to change

  const newLine = [
    ...line.slice(0, lineIndex), // Getting all values before index to change
    number, // Add number to array
    ...line.slice(lineIndex + 1, line.length), // Getting all values after index to change
  ];

  return [ // Creating new board
    ...board.slice(0, columnIndex), // Lines before index
    newLine, // New line
    ...board.slice(columnIndex + 1, board.length), // Lines after index
  ];
};