$collection = new Collection(['data' => array_merge(array_fill(0, 10, 1), array_fill(0, 10, 2))]);
$filter = function ($item) {
return $item === 1;
};
$result = $collection->find($filter);
expect($result)->toBeAnInstanceOf(Collection::class);
expect($result->data())->toBe(array_fill(0, 10, 1));
});
});
describe("->map()", function () {
it("applies a Closure to a copy of all data in the collection", function () {
$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 () {