ludic/docs/language/random/random-range.md
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Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-08-29 17:53:22 +03:00

1.8 KiB

id name category kind tokens sig tip order ns member
random-range Random.range random namespace-method Random.range Random.range(low, high) -> int A random integer in the inclusive range [low, high]. 0 Random range

Returns a random integer between low and high, inclusive of both ends — so Random.range(low: 0, high: 3) can return 0, 1, 2, or 3. Use it to place things randomly on a grid, pick from a list of options by index, or add jitter to positions and timers. The sequence is deterministic for a given seed, so call Random.seed first if you need reproducible runs. To pick a random column across a grid of width GRID_WIDTH, pass high: GRID_WIDTH - 1, since the last valid index is one less than the count.

Parameters:

  • low — the smallest value that can be returned (inclusive)
  • high — the largest value that can be returned (inclusive)
program ScatterPickups {
  property Position { column: int = 0, row: int = 0 }
  model Pickup { Position }

  const GRID_WIDTH: int = 20
  const GRID_HEIGHT: int = 15
  const TILE_SIZE: int = 16

  handler SeedPickups phase Start {
    Random.seed(value: 7)
    for spawn_index in 0 .. 5 {
      spawn Pickup {
        Position {
          column: Random.range(low: 0, high: GRID_WIDTH - 1),
          row: Random.range(low: 0, high: GRID_HEIGHT - 1)
        }
      }
    }
  }

  handler DrawWorld phase Render {
    Screen.clear(Color.MidnightBlue)
    for (Position) in query [Position, {Pickup}] {
      Screen.fill_rectangle(
        x: Position.column * TILE_SIZE,
        y: Position.row * TILE_SIZE,
        width: TILE_SIZE,
        height: TILE_SIZE,
        color: Color.Gold)
    }
    Screen.show()
  }
}