$collection = new Collection(['data' => [1, 2, 3, 4, 5]]);
$filter = function ($item) {
return ++$item;
};
$result = $collection->map($filter);
expect($result)->not->toBe($collection);
expect($result->data())->toBe([2, 3, 4, 5, 6]);
});
});
describe("->reduce()", function () {
it("reduces a collection down to a single value", function () {
$collection = new Collection(['data' => [1, 2, 3]]);
$filter = function ($memo, $item) {
return $memo + $item;
};
expect($collection->reduce($filter, 0))->toBe(6);
expect($collection->reduce($filter, 1))->toBe(7);
});
});
describe("->slice()", function () {
it("extracts a slice of items", function () {
$collection = new Collection(['data' => [1, 2, 3, 4, 5]]);
$result = $collection->slice(2, 2);
expect($result)->not->toBe($collection);
expect($result->data())->toBe([3, 4]);
});
});
describe("->sort()", function () {
it("sorts a collection", function () {
$collection = new Collection(['data' => [5, 3, 4, 1, 2]]);
$result = $collection->sort();
