Workshop › 2048 › Step 8 of 26

A new tile

What we are doing

addTile picks one empty cell at random and puts a 2 there nine times out of ten, a 4 otherwise.

```js
function addTile() {
  const cells = emptyCells()
  if (cells.length === 0) return
  const [row, col] = cells[Math.floor(Math.random() * cells.length)]
  board[row][col] = Math.random() < 0.9 ? 2 : 4
}
```

What it means

Math.floor(Math.random() * cells.length) is a random position in the list, from 0 to length - 1.
const [row, col] = ... takes the pair apart into two names (array destructuring).
Math.random() < 0.9 is true 9 times in 10.

Your turn

Write addTile above function newGame() { (under emptyCells), with an empty line after it.

Skills: Arrays and objects

← Find the empty cells Two tiles to start →

All steps