Small Talk/문법정리

• 실제로 쓰이는 문법은 아니다. 하지만, Smalltlak 설명에서 해당 메소드가 어디에서 발현되는지를 알수 있게 만들어 준다.
  
• Debug 모드에서 메세지의 흐름을 나타낼때도 이용된다.
  

~cpp 
a := 1.
b := OrderedCollection new.

~cpp 
Money class>>amout: anAmount
    self new setAmount: anAmount.

~cpp 
TempTestCase>>initialize
    super initialize.

~cpp 
a := OrderdCollection new
    add: 10;
    add: 1;
    add; 9;
    yourself.

~cpp 
Color>>alpha
    ...
    ^1.0

~cpp 
"Code in Bold"		"Comments in double-quotes"
3 squared.		"Receiver object is small integer 3."
			"The message sent is   #squared"

'abc' asUppercase.	"Receiver object is string 'abc'."
			"The message sent is   #asUppercase"

200 factorial.		"Receiver object is small integer 200."
			"The message sent is   #factorial"

• 선택자는 단일 식별자이며, 인수는 없다.(the selector is a single Identifier, there are no arguments)
  
• 예시)
  

  ~cpp 
  3 negated			"selector is  #negated"
  'abcdefg' reverse		"selector is  #reverse"
  

• 선택자는 특정한 기호(하나나 둘이상의 문자, 숫자가 아님)이고, 인수가 딱 하나만 있다.(the selector is one or two non-alphanumeric characters, followed by exactly one argument object)
  
• 예시)
  

  ~cpp 
  3 + 5				"selector is  #+"
  				"argument is the Integer object 5"
  'abc' , 'xyz'			"selector is  #,  (comma character)"
  				"argument is the String 'xyz'"
  20 <= 20			"selector is  #<="
  				"argument is the Integer object 20"
  

• 키워드란 콜론(:)이 뒤에 붙는 식별자이다.(a keyword is an Identifier followed by colon ":" )
  
• 각 키워드에 인수가 있을 때, 선택자는 하나 이상의 키워드이다.(the selector is one or more keywords, when called each keyword is followed by an argument object) -> 세번째 예시 참고
  
• 예시)
  

  ~cpp 
  3 raisedTo: 17.			"selector is  #raisedTo:"
  				"argument is 17"
  3 between: 5 and: 10.		"selector is  #between:and:"
  				"arguments are 5 and 10"
  Point x: 4 y: 200. 		"receiver is the object Point"
  				"selector is  #x:y"
  				"arguments are 4 and 200"