for...of
Iterates lazily in row-major order (top to bottom, left to right) over all matching cells in a quadrille
. Each iteration yields a cell object of the form { row, col, value }
. This pattern mirrors JavaScript’s for...of
, which is used to loop over iterable objects like arrays and generators.
To yield only a subset of cells, use the cells(filter)
method within the loop. The visit(callback, filter?)
method offers a concise alternative by applying a callback
function to each yielded cell.
Example: Filtering by Value Collection
(click on canvas to randomize q
)
code
Quadrille.cellLength = 50;
let q, hint;
const monkeys = ['🙈', '🙉', '🙊', '🦧'];
const birds = ['🐍', '🦜', '🦚', '🐤'];
const emojis = [...monkeys, ...birds, '🐸', '🐯', '🐱', '🐶', '🐮'];
function setup() {
createCanvas(8 * Quadrille.cellLength, 8 * Quadrille.cellLength);
highlight();
}
function draw() {
background('#DAF7A6');
drawQuadrille(q);
drawQuadrille(hint);
}
function mousePressed() {
highlight();
}
function highlight() {
q = createQuadrille(8, 8);
for (const { row, col } of q) {
q.fill(row, col, random(emojis));
}
hint = createQuadrille(8, 8);
for (const { row, col } of q.cells(monkeys)) {
hint.fill(row, col, color(0, 140));
}
}
ℹ️
- The first loop (
for (const { row, col } of q)
) iterates all cells to fill them randomly. - The second loop (
for (const { row, col } of q.cells(monkeys))
) filters cells containing monkey emojis.
Example: Filtering by Predicate (Value)
(click on canvas to randomize q
)
code
Quadrille.cellLength = 50;
let q, hint;
function setup() {
createCanvas(8 * Quadrille.cellLength, 8 * Quadrille.cellLength);
highlight();
}
function draw() {
background('#D6EAF8');
drawQuadrille(q);
drawQuadrille(hint);
}
function mousePressed() {
highlight();
}
function highlight() {
q = createQuadrille(8, 8).rand(15, '🐸').rand(15, '🐯').rand(15, '🐮');
hint = createQuadrille(8, 8);
for (const { row, col } of q.cells(({ value }) => Quadrille.isFilled(value))) {
hint.fill(row, col, color(0, 140));
}
}
Example: Filtering by Combined Predicates (Value, Row, Col)
(move mouse to highlight 🐸 in hovered column; click to randomize q
)
code
Quadrille.cellLength = 50;
let q, hint;
function setup() {
createCanvas(8 * Quadrille.cellLength, 8 * Quadrille.cellLength);
q = createQuadrille(8, 8).rand(15, '🐸').rand(15, '🐯').rand(15, '🐮');
highlight();
}
function draw() {
background('#D7BDE2');
drawQuadrille(q);
drawQuadrille(hint);
}
function mousePressed() {
q.randomize();
highlight();
}
function mouseMoved() {
highlight();
}
function highlight() {
hint = createQuadrille(8, 8);
for (const { row, col } of q.cells(({ value, col }) => value === '🐸' && col === q.mouseCol)) {
hint.fill(row, col, color(0, 140));
}
}
Syntax
for (const cell of q)
for (const cell of q.cells(filter))
for (const { row, col, value } of q)
for (const { row, col, value } of q.cells(filter))
Parameters
Param | Description |
---|---|
filter | Optional filter to restrict cells visited. Can be:
|