public function testIterator()
{
$shelf = new BookShelf();
$books = ["A", "B", "C", "D", "E", "F"];
foreach ($books as $book) {
$shelf->add(new Book($book));
}
$i = 0;
$iterator = $shelf->iterator();
while ($iterator->hasNext()) {
$elm = $iterator->next();
$this->assertEquals($elm->name, $books[$i++]);
}
}
<?php
namespace Iterator\my;
require_once __DIR__ . '/../autoload.php';
$bookShelf1 = new BookShelf();
$bookShelf1->appendBook(new Book('Around the World in 80 Days'));
$bookShelf1->appendBook(new Book('Bible'));
$bookShelf1->appendBook(new Book('Cinderella'));
$bookShelf1->appendBook(new Book('Daddy-Long-Legs'));
$it = $bookShelf1->iterator();
while ($it->hasNext()) {
$book = $it->next();
echo $book->getName(), PHP_EOL;
}
$bookShelf2 = new BookShelfImplementsIteratorAggregate();
$bookShelf2->appendBook(new Book('Around the World in 80 Days'));
$bookShelf2->appendBook(new Book('Bible'));
$bookShelf2->appendBook(new Book('Cinderella'));
$bookShelf2->appendBook(new Book('Daddy-Long-Legs'));
/** @var Book $book */
foreach ($bookShelf2 as $book) {
echo $book->getName(), PHP_EOL;
}
$bookShelf3 = new BookShelfWithPhpIterator();
$bookShelf3->appendBook(new Book('Around the World in 80 Days'));
$bookShelf3->appendBook(new Book('Bible'));
$bookShelf3->appendBook(new Book('Cinderella'));
$bookShelf3->appendBook(new Book('Daddy-Long-Legs'));
/** @var Book $book */
foreach ($bookShelf3->iterator() as $book) {
/**
* Checks if current position is valid
*
* @return boolean The return value will be casted to boolean and then evaluated.
* Returns true on success or false on failure.
*/
public function valid()
{
return !is_null($this->bookShelf->getBookAt($this->index));
}
/**
* @return Book
*/
public function next()
{
$book = $this->bookShelf->getBookAt($this->index);
$this->index++;
return $book;
}
