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An Introduction to Object-Oriented Programming,...

Jack Lenox
September 06, 2016

An Introduction to Object-Oriented Programming, Design Patterns, and Test-Driven Development

A talk given at WordCamp Singapore 2016. Notes and resources available on GitHub here: https://github.com/jacklenox/introduction-to-oop

Jack Lenox

September 06, 2016
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  1. "Object­oriented programming (OOP) is a programming paradigm based on the

    concept of "objects", which may contain data, in the form of fields, often known as attributes; and code, in the form of procedures, often known as methods." Wikipedia
  2. Procedural Form Submission < ? p h p i f

    ( i s s e t ( $ _ P O S T [ ' n a m e ' ] ) ) { $ n a m e = s a n i t i z e _ t e x t _ f i e l d ( $ _ P O S T [ ' n a m e ' ] ) ; i f ( s t r l e n ( $ n a m e ) < 6 ) { e c h o ' N a m e n o t l o n g e n o u g h ' ; e x i t ; } } ? > / / F o r m i n p u t e t c .
  3. Blog post Attributes: Title: My awesome blog post! Date: 2016­09­06

    Sticky: false Methods: Update Publish Delete
  4. Language Classes Attributes Methods p r i v a t

    e , p r o t e c t e d , p u b l i c
  5. Class c l a s s C a r {

    / / C l a s s b o d y }
  6. Attributes c l a s s C a r {

    p u b l i c $ c o l o r ; p u b l i c $ d o o r s ; p u b l i c $ l u g g a g e _ r a c k ; }
  7. Methods c l a s s C a r {

    f u n c t i o n a c c e l e r a t e ( ) { e c h o ' T y r e s q u e a l ! ' ; } f u n c t i o n b r a k e ( ) { e c h o ' S c r e e c h ' ; } f u n c t i o n s t e e r ( $ d e g r e e ) { e c h o " S t e e r b y $ d e g r e e d e g r e e s " ; } }
  8. Car Factory c l a s s C a r

    { p u b l i c $ c o l o r = ' w h i t e ' ; p u b l i c $ d o o r s = 2 ; p u b l i c $ l u g g a g e _ r a c k = f a l s e ; f u n c t i o n a c c e l e r a t e ( ) { e c h o ' T y r e s q u e a l ! ' ; } f u n c t i o n b r a k e ( ) { e c h o ' S c r e e c h ' ; } f u n c t i o n s t e e r ( $ d e g r e e ) { e c h o " S t e e r b y $ d e g r e e d e g r e e s " ; } }
  9. Build a Car $ n e w _ c a

    r = n e w C a r ( ) ;
  10. Build a Yellow Car with Two Doors $ y e

    l l o w _ c a r = n e w C a r ( ) ; $ y e l l o w _ c a r ­ > c o l o r = " y e l l o w " ; $ y e l l o w _ c a r ­ > d o o r s = 4 ;
  11. Introducing _ _ c o n s t r u

    c t c l a s s C a r { p u b l i c $ c o l o r ; p u b l i c $ d o o r s ; p u b l i c $ l u g g a g e _ r a c k ; f u n c t i o n _ _ c o n s t r u c t ( $ c o l o r , $ d o o r s , $ l u g g a g e _ r a c k ) { $ t h i s ­ > c o l o r = $ c o l o r ; $ t h i s ­ > d o o r s = $ d o o r s ; $ t h i s ­ > l u g g a g e _ r a c k = $ l u g g a g e _ r a c k ; } / / M e t h o d s g o h e r e }
  12. Build a Purple Car with Four Doors and a Luggage

    Rack $ p u r p l e _ c a r = n e w C a r ( ' p u r p l e ' , 4 , t r u e ) ;
  13. Documenting Classes / * * * D e f i

    n e s c a r f a c t o r y . * T h e c a r c l a s s p r o d u c e s c a r s * * @ p a c k a g e c a r * @ a u t h o r J a c k L e n o x * @ c o p y r i g h t 2 0 1 6 A u t o m a t t i c I n c . * / c l a s s C a r { / / C l a s s b o d y }
  14. Documenting Properties c l a s s C a r

    { / * * * T h e c a r c o l o r . * U s e d b y t h e m a n u f a c t u r i n g p r o c e s s * @ v a r s t r i n g * / p u b l i c $ c o l o r ; / * * * T h e n u m b e r o f d o o r s . * A l s o u s e d b y t h e m a n u f a c t u r i n g p r o c e s s * @ v a r i n t e g e r * / p u b l i c $ d o o r s ; / * * * W h e t h e r o r n o t t h e c a r h a s a l u g g a g e r u c k . * Y o u ' v e g u e s s e d i t , a l s o f o r m a n u f a c t u r i n g * @ v a r b o o l * / p u b l i c $ l u g g a g e _ r a c k ; / / . . .
  15. Documenting Methods / / . . . / * *

    * A c c e l e r a t e t o m o v e t h e c a r f o r w a r d s . * A c c e l e r a t i o n i s c u r r e n t l y n o t v a r i a b l e s o t h i s * m e t h o d w i l l r e t u r n a s q u e a l f r o m t h e t y r e s a s * t h e w h e e l s s p i n . * @ r e t u r n s t r i n g * / f u n c t i o n a c c e l e r a t e ( ) { r e t u r n ' T y r e s q u e a l ! ' ; } / / . . .
  16. A Basic Test u s e P H P U

    n i t \ F r a m e w o r k \ T e s t C a s e ; r e q u i r e _ o n c e ( ' c l a s s ­ c a r . p h p ' ) ; c l a s s C a r T e s t e x t e n d s T e s t C a s e { p r i v a t e $ c a r ; p u b l i c f u n c t i o n s e t U p ( ) { $ t h i s ­ > c a r = n e w C a r ( ' y e l l o w ' , 4 , t r u e ) ; } p u b l i c f u n c t i o n t e a r D o w n ( ) { } p u b l i c f u n c t i o n t e s t G e t C a r ( ) { $ t h i s ­ > a s s e r t E q u a l s ( $ t h i s ­ > c a r ­ > c o l o r , ' y e l l o w ' ) ; $ t h i s ­ > a s s e r t E q u a l s ( $ t h i s ­ > c a r ­ > d o o r s , 4 ) ; $ t h i s ­ > a s s e r t T r u e ( $ t h i s ­ > c a r ­ > l u g g a g e _ r a c k ) ; } }
  17. Run the Test $ p h p u n i

    t ­ ­ v e r b o s e t e s t s P H P U n i t 5 . 5 . 4 b y S e b a s t i a n B e r g m a n n a n d c o n t r i b u t o r s . R u n t i m e : P H P 7 . 0 . 8 ­ 0 u b u n t u 0 . 1 6 . 0 4 . 2 . 1 / 1 ( 1 0 0 % ) T i m e : 1 0 5 m s , M e m o r y : 8 . 0 0 M B O K ( 1 t e s t , 3 a s s e r t i o n s )
  18. Widgets API c l a s s M y _

    W i d g e t e x t e n d s W P _ W i d g e t { / * * * S e t s u p t h e w i d g e t s n a m e e t c * / p u b l i c f u n c t i o n _ _ c o n s t r u c t ( ) { $ w i d g e t _ o p s = a r r a y ( ' c l a s s n a m e ' = > ' m y _ w i d g e t ' , ' d e s c r i p t i o n ' = > ' M y W i d g e t i s a w e s o m e ' , ) ; p a r e n t : : _ _ c o n s t r u c t ( ' m y _ w i d g e t ' , ' M y W i d g e t ' , $ w i d g e t _ o p s ) ; } / / / C o n t i n u e s . . .
  19. / * * * O u t p u t

    s t h e c o n t e n t o f t h e w i d g e t * * @ p a r a m a r r a y $ a r g s * @ p a r a m a r r a y $ i n s t a n c e * / p u b l i c f u n c t i o n w i d g e t ( $ a r g s , $ i n s t a n c e ) { / / o u t p u t s t h e c o n t e n t o f t h e w i d g e t } / * * * O u t p u t s t h e o p t i o n s f o r m o n a d m i n * * @ p a r a m a r r a y $ i n s t a n c e T h e w i d g e t o p t i o n s * / p u b l i c f u n c t i o n f o r m ( $ i n s t a n c e ) { / / o u t p u t s t h e o p t i o n s f o r m o n a d m i n }
  20. / * * * P r o c e s

    s i n g w i d g e t o p t i o n s o n s a v e * * @ p a r a m a r r a y $ n e w _ i n s t a n c e T h e n e w * o p t i o n s * @ p a r a m a r r a y $ o l d _ i n s t a n c e T h e p r e v i o u s * o p t i o n s * / p u b l i c f u n c t i o n u p d a t e ( $ n e w _ i n s t a n c e , $ o l d _ i n s t a n c e ) { / / p r o c e s s e s w i d g e t o p t i o n s t o b e s a v e d } }