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<?php /* Challenge 2: Implement AnswerInterface and get Question to echo "4". */ class Question { public function __construct(AnswerInterface $answer) { echo "What is 2 + 2?\n"; $answer = $answer->get()->the()->answer(); if ($answer instanceof AnswerInterface) { var_dump('yo'); echo $answer . PHP_EOL; } } } interface AnswerInterface { public function get(); public function the(); public function answer(); } // start editing here class Answer implements AnswerInterface { public function get() { return $this; } public function the() { return $this; } public function answer() { return $this; } public function __toString() { return 4; } } // end editing here $answer = new Answer; $question = new Question($answer);

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40.68 ms | 402 KiB | 5 Q