Donghee

one -to- many relationship ⇒ use a collection

dynamincally sized collection

ex

 | oc |
 oc := OrderedCollection new: 1.
 1 to: 3 do: [:n | a add: n].
 ^ a

 an OrderedCollection(1 2 3)

How do you compactly code (OredredCollection or Array) 예

 #(plain plain plain bold bold bold bold) -대체-> 3--#plain, 4--#bold

don't want duplicates in collection

예 {{{ #(1 1 1 1 2 2 2) asSet.

a Set(1 2) </code>

새로운 object를 추가할때 equaluty 유지하기?

collection 에서 어떤 특정 조건의 sorting

colletion with fixed number of element 예

 | a | 
 a := Array new: 5. 
 1 to: a size do: [ :n | a at: n put: n ]. 
 ^ a
 
 #(1 2 3 4 5)

homogenous(균일한) information을 저장할때 사용

 sequence number in collection
 (1 to: 20) do: [:each | ...]

예

 | collection oc | 
 collection := 1 to: 20 by: 2. 
 oc := OrderedCollection new. 
 oc addAll: collection. 
 ^ oc 
 
 an OrderedCollection(1 3 5 7 9 11 13 15 17 19)