return {
	generate: generate,
	iter: iter,
	square: square
};

function generate(width, height, f) {
	var result = [];
	for(var row = 0; row < height; row++) {
		result[row] = [];;
		for(var column = 0; column < width; column++) {
			result[row].push(f(row, column));
		}
	}
	return result;
}

function iter(grid, f) {
	generate(grid.length > 0 ? grid[0].length : null, grid.length, f);
}

function square(size) {
	return generate(size, size, function() {return;});
}