visit(callback)

Iterates all cells in row-major order and calls callback({ row, col, value }) for each. Reading and mutating the grid inside the callback is allowed.

Example#

(click to randomly refill q with emojis)

code

Quadrille.cellLength = 50;
let q;
const emojis = ['🐸', '🐯', '🐱', '🐶', '🐮'];

function setup() {
  createCanvas(8 * Quadrille.cellLength, 8 * Quadrille.cellLength);
  q = createQuadrille(8, 8);
  update();
}

function draw() {
  background('#DAF7A6');
  drawQuadrille(q);
}

function mousePressed() {
  update();
}

function update() {
  q.visit(({ row, col }) => q.fill(row, col, random(emojis)));
}

All cells are visited in row-major order.
The callback decides what to do with each cell (e.g., refill with a random emoji).

Syntax#

visit(callback)

Parameters#

Param	Description
`callback`	Function called for each visited cell, receiving an object `{ row, col, value }`. Its return value is ignored