Usually, these are put in two different files, with the interface using the ".h" extension and the implementation using the ".m" extension.
j uː ʒ uː ə l i WORD_BOUNDARY ð iː z WORD_BOUNDARY ɑ ɹ WORD_BOUNDARY p ʊ t WORD_BOUNDARY ɪ n WORD_BOUNDARY t uː WORD_BOUNDARY d ɪ f ɹ ə n t WORD_BOUNDARY f aɪ l z WORD_BOUNDARY w ɪ ð ð ɪ WORD_BOUNDARY ɪ n t ə ɹ f eɪ s WORD_BOUNDARY j uː z ɪ ŋ WORD_BOUNDARY ð ɪ WORD_BOUNDARY eɪ t̠ʃ WORD_BOUNDARY ɛ k s t ɛ n ʃ ə n WORD_BOUNDARY æ n d WORD_BOUNDARY ð ɪ WORD_BOUNDARY ɪ m p l ɪ m ə n t eɪ ʃ ə n WORD_BOUNDARY j uː z ɪ ŋ WORD_BOUNDARY ð ɪ WORD_BOUNDARY ɛ m WORD_BOUNDARY ɛ k s t ɛ n ʃ ə n WORD_BOUNDARY