Function visitor

Visits every cell in grid using supplied selection function In-built functions to use: visitorDepth, visitorBreadth, visitorRandom, visitorColumn, visitorRow.

Usage example:

 let visitor = Grids.visitor(Grids.visitorRandom, grid, startCell);
 for (let cell of visitor) {
  // do something with cell
 }
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If you want to keep tabs on the visitor, pass in a MutableValueSet. This is updated with visited cells (and is used internally anyway)

 let visited = new mutableValueSet<Grids.Cell>(c => Grids.cellKeyString(c));
 let visitor = Grids.visitor(Grids.visitorRandom, grid, startCell, visited);
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To visit with some delay, try this pattern

 const delayMs = 100;
 const run = () => {
  let cell = visitor.next().value;
  if (cell === undefined) return;
  // Do something with cell
  setTimeout(run, delayMs);
 }
 setTimeout(run, delayMs);
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