Workshop › Bomberman-style Arena › Step 20 of 42

A cross of flames

What we are doing

The explosion is a cross: from the bomb's tile, power tiles in each of the four directions. Each arm walks out tile by tile; a wall stops it.

```js
let power

  power = 2

  for (const [dr, dc] of Object.values(DIRS)) {
    for (let i = 1; i <= power; i++) {
      const r = bomb.r + dr * i
      const c = bomb.c + dc * i
      if (grid[r][c] === '#') break
      flames.push({ r, c, time: FLAME_TIME })
    }
  }
```

What it means

Object.values(DIRS) is the list of the four steps: [[-1, 0], [1, 0], [0, -1], [0, 1]].
The inner loop goes 1, 2, ... power tiles out along one direction.
break leaves the inner loop only: that arm ends and the next direction starts.
{ r, c, time: ... } is short for { r: r, c: c, time: ... }.

Your turn

Under let maxBombs write let power; in reset, under maxBombs = 1, write power = 2.
At the end of explode, under the first flame, write the two loops.

Skills: Loops

← Flames die down Crates burn →

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