Smalltalk Best Practice Patterns Volume 1: Coding - Free

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Table of ContentsTABLE OF CONTENTS .......................................................................................................................................2PREFACE ......................................................................................................................................................5ACKNOWLEDGMENTS.............................................................................................................................7INTRODUCTION .........................................................................................................................................8CODING............................................................................................................................................................9Talking Programs........................................................................................................................................9GOOD SOFTWARE...........................................................................................................................................11STYLE.............................................................................................................................................................13WHAT’S MISSING? .........................................................................................................................................14ORGANIZATION ..............................................................................................................................................15ADOPTION ......................................................................................................................................................16PATTERNS..................................................................................................................................................17WHY PATTERNS WORK..................................................................................................................................18ROLE OF PATTERNS........................................................................................................................................20Reading......................................................................................................................................................20Development..............................................................................................................................................20Review .......................................................................................................................................................20Documentation ..........................................................................................................................................20Clean Up ...................................................................................................................................................20FORMAT .........................................................................................................................................................21BEHAVIOR .................................................................................................................................................22METHODS.......................................................................................................................................................23Composed Method ................................................................................................................................................. 24Complete Creation Method .................................................................................................................................... 26Creation Parameter Method ................................................................................................................................... 27Conversion ............................................................................................................................................................. 28Converter Method .................................................................................................................................................. 29Converter Creation Method.................................................................................................................................... 30Constructor Method ............................................................................................................................................... 31Query Method ........................................................................................................................................................ 32Comparing Method ................................................................................................................................................ 33Execute Around Method ........................................................................................................................................ 34Debug Printing Method.......................................................................................................................................... 35MESSAGES......................................................................................................................................................36Message.................................................................................................................................................................. 37Choosing Message ................................................................................................................................................. 38Decomposing Message........................................................................................................................................... 40Intention Revealing Message ................................................................................................................................. 41Intention Revealing Selector .................................................................................................................................. 42Double Dispatch..................................................................................................................................................... 43Send Back .............................................................................................................................................................. 45Super ...................................................................................................................................................................... 47Extending Super..................................................................................................................................................... 48Modifying Super .................................................................................................................................................... 49Delegation .............................................................................................................................................................. 50Simple Delegation.................................................................................................................................................. 51Self Delegation....................................................................................................................................................... 52Pluggable Behavior ................................................................................................................................................ 54Pluggable Selector.................................................................................................................................................. 55Pluggable Block ..................................................................................................................................................... 56Collecting Parameter.............................................................................................................................................. 57Coding Patterns page 2 of 147 9/30/2006
STATE..........................................................................................................................................................59INSTANCE VARIABLES....................................................................................................................................60Common State........................................................................................................................................................ 61Variable State......................................................................................................................................................... 62Explicit Initialization.............................................................................................................................................. 63Lazy Initialization .................................................................................................................................................. 65Default Value Method............................................................................................................................................ 66Constant Method.................................................................................................................................................... 67Direct Variable Access........................................................................................................................................... 68Indirect Variable Access ........................................................................................................................................ 69Getting Method ...................................................................................................................................................... 70Setting Method....................................................................................................................................................... 71Collection Accessor Method .................................................................................................................................. 72Enumeration Method.............................................................................................................................................. 74Boolean Property Setting Method .......................................................................................................................... 75Role Suggesting Instance Variable Name .............................................................................................................. 76TEMPORARY VARIABLES................................................................................................................................77Temporary Variable ............................................................................................................................................... 78Collecting Temporary Variable.............................................................................................................................. 79Caching Temporary Variable ................................................................................................................................. 80Explaining Temporary Variable ............................................................................................................................. 81Reusing Temporary Variable ................................................................................................................................. 82Role Suggesting Temporary Variable Name.......................................................................................................... 83COLLECTIONS..........................................................................................................................................84CLASSES.........................................................................................................................................................85Collection............................................................................................................................................................... 86OrderedCollection .................................................................................................................................................. 87RunArray................................................................................................................................................................ 88Set .......................................................................................................................................................................... 89Equality Method..................................................................................................................................................... 91Hashing Method..................................................................................................................................................... 93Dictionary............................................................................................................................................................... 94SortedCollection..................................................................................................................................................... 96Array ...................................................................................................................................................................... 97ByteArray............................................................................................................................................................... 98Interval ................................................................................................................................................................... 99COLLECTION PROTOCOL...............................................................................................................................101IsEmpty ................................................................................................................................................................ 102Includes:............................................................................................................................................................... 103Concatentation ..................................................................................................................................................... 104Enumeration ......................................................................................................................................................... 105Do......................................................................................................................................................................... 106Collect.................................................................................................................................................................. 107Select/Reject......................................................................................................................................................... 108Detect ................................................................................................................................................................... 109Inject:into:............................................................................................................................................................ 110COLLECTION IDIOMS ....................................................................................................................................111Duplicate Removing Set....................................................................................................................................... 112Temporarily Sorted Collection............................................................................................................................. 113Stack..................................................................................................................................................................... 114Queue ................................................................................................................................................................... 115Searching Literal .................................................................................................................................................. 117Lookup Cache ...................................................................................................................................................... 118Parsing Stream ..................................................................................................................................................... 120Concatenating Stream .......................................................................................................................................... 121CLASSES ...................................................................................................................................................122Simple Superclass Name ...................................................................................................................................... 123Coding Patterns page 3 of 147 9/30/2006
Page 1: Smalltalk Best Practice PatternsVol
Page 5 and 6: PrefaceThis preface will explain wh
Page 7: AcknowledgmentsI would like to than
Page 10 and 11: Many of the patterns tell you what
Page 12 and 13: day to day in development and docum
Page 14 and 15: What’s Missing?There are a few co
Page 16 and 17: AdoptionHow can you learn and use t
Page 18 and 19: Why Patterns WorkHere is the Big As
Page 20 and 21: Role of PatternsReadingThese patter
Page 22 and 23: BehaviorObjects model the world thr
Page 24 and 25: Composed MethodYou are implementing
Page 26 and 27: Complete Creation MethodA Composed
Page 28 and 29: ConversionHow do you convert inform
Page 30 and 31: Converter Creation MethodYou need t
Page 32 and 33: Query MethodA Composed Method has h
Page 34 and 35: Execute Around MethodHow do you rep
Page 36 and 37: MessagesMessages are the heartbeat
Page 38 and 39: Choosing MessageYou are using a Mes
Page 40 and 41: Decomposing MessageYou are using a
Page 42 and 43: Intention Revealing SelectorYou may
Page 44 and 45: Integer>>addFloat: aFloat^self asFl
Page 46 and 47: Class: SuperFindingClientsuperclass
Page 48 and 49: Extending SuperYou are using Super.
Page 50 and 51: DelegationA Composed Method needs w
Page 52 and 53:
Self DelegationYou are using Delega
Page 54 and 55:
Pluggable BehaviorHow can you param
Page 56 and 57:
Pluggable BlockYou need complex Plu
Page 58 and 59:
marriedMenAndUnmarriedWomen^self ma
Page 60 and 61:
Instance VariablesI wrote the secti
Page 62 and 63:
Variable StateHow do you represent
Page 64 and 65:
Timer>>defaultMillisecondPeriod^100
Page 66 and 67:
Default Value MethodYou have a comp
Page 68 and 69:
Direct Variable AccessYou need to a
Page 70 and 71:
Getting MethodYou are using Lazy In
Page 72 and 73:
Collection Accessor MethodYou are u
Page 74 and 75:
Enumeration MethodYou are using Ind
Page 76 and 77:
Role Suggesting Instance Variable N
Page 78 and 79:
Temporary VariableA Composed Method
Page 80 and 81:
Caching Temporary VariableA Perform
Page 82 and 83:
Reusing Temporary VariableTemporary
Page 84 and 85:
CollectionsThe collection hierarchy
Page 86 and 87:
CollectionHow do you represent a on
Page 88 and 89:
RunArrayYou are using an OrderedCol
Page 90 and 91:
| s |s := Set new.Like an OrderedCo
Page 92 and 93:
You may need Double Dispatch for co
Page 94 and 95:
DictionaryYou need a Collection tha
Page 96 and 97:
SortedCollectionYou have a Collecti
Page 98 and 99:
ByteArrayYou need to represent an A
Page 100 and 101:
(1 to: anArray size) collect:[:each
Page 102 and 103:
IsEmptyHow do you test if a collect
Page 104 and 105:
ConcatentationHow do you put two co
Page 106 and 107:
DoHow do you execute code for each
Page 108 and 109:
Select/RejectHow do you execute cod
Page 110 and 111:
Inject:into:You need an Enumeration
Page 112 and 113:
Duplicate Removing SetYou have a Co
Page 114 and 115:
StackHow do you implement a stack?O
Page 116 and 117:
implementation of queues in Pascal
Page 118 and 119:
Lookup CacheHow do you optimize com
Page 120 and 121:
Parsing StreamHow do you write a si
Page 122 and 123:
ClassesThere is probably no coding
Page 124 and 125:
Qualified Subclass NameYou have cre
Page 126 and 127:
FormattingNo other topic generates
Page 128 and 129:
Type Suggesting Parameter NameYou a
Page 130 and 131:
Rectangular BlockYou are writing an
Page 132 and 133:
Conditional ExpressionHow do you fo
Page 134 and 135:
Simple Enumeration ParameterWhat sh
Page 136 and 137:
self listPane parentcolor: Color bl
Page 138 and 139:
Point>>printOn: aStreamaStreamprint
Page 140 and 141:
Development ExampleIn this chapter,
Page 142 and 143:
Money>>setAmount: aNumber currency:
Page 144 and 145:
MoneySum>>printOn: aStreammonies do
Page 146:
| m1 m2 |m1 := Moneyamount: 5curren
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