Apple WebObjects 3.5 User Manual Page 197
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Commonly Used Array Methods
197
Creating Arrays
The methods in this section are class methods, as denoted by the plus sign
(+). You use class methods to send messages to a class—in this case,
NSArray or NSMutableArray. For more information on class methods, see
“Sending a Message to a Class” (page 172).
+ array
Returns an empty array. Usually used to create NSMutableArrays.
NSArrays created with this method are permanently empty.
// Most common use
id mutableArray = [NSMutableArray array];
// May not be what you want
id array = [NSArray array];
+ arrayWithObject:
Returns an array containing the single specified object.
+ arrayWithObjects:
Returns an array containing the objects in the argument list. The
argument list is a comma-separated list of objects ending with
nil.
id array = [NSMutableArray arrayWithObjects:
@"Plates", @"Plasticware", @"Napkins", nil];
+ arrayWithArray:
Returns an array containing the contents of a specified array.
Usually used to create an NSMutableArray from an immutable
NSArray. For example, the following statement creates an
NSMutableArray from a constant NSArray object:
id mutableArray = [NSMutableArray
arrayWithArray:@("A", "B", "C")];
+ arrayWithContentsOfFile:
Returns an array initialized from the contents of a specified file.
The specified file can be a full or relative pathname; the file that it
names must contain a string representation of an array, such as that
produced by the
writeToFile:atomically: method.
See also
description (page 200) .
Querying Arrays
– count
Returns the number of objects in the array.
- WEBOBJECTS 1
- DEVELOPER’S GUIDE 1
- Contents 3
- Table of Contents 5
- Part II Special Tasks 6
- Managing State 109 6
- Part III WebScript 7
- The WebScript Language 163 7
- Foundation Classes 187 7
- Index 211 7
- Introduction 9
- About This Book 11
- Other Useful Documentation 12
- WEBOBJECTS ESSENTIALS 15
- Chapter 1 17
- <DocumentRoot> 19
- Components 20
- Template 21
- Code or Script File 21
- Bindings 22
- Application Code 23
- Session Code 23
- A Note on WebObjects Classes 23
- Application Directory 24
- WebObjects Adaptors 26
- WODefaultApp 27
- Dynamic Elements 29
- Server-Side Dynamic Elements 31
- Chapter 2 Dynamic Elements 32
- .wod file: 33
- Declarations File Syntax 36
- Client-Side Java Components 37
- Common Methods 41
- Action Methods 43
- Chapter 3 Common Methods 44
- Application Initialization 47
- Session Initialization 48
- Component Initialization 49
- Request-Handling Methods 50
- Invoking an Action 52
- Generating a Response 53
- Chapter 4 55
- Debugging WebScript 57
- Debugging Java 57
- Debugging Techniques 58
- Using Trace Methods 59
- Programming Pitfalls to Avoid 60
- Java Programming Pitfalls 61
- Chapter 5 63
- Server and Application Level 65
- Session Level 66
- Request Level 68
- Page Level 69
- Database Integration Level 71
- Accessing the Session 74
- Assigning Input Values 78
- Generating the Response 80
- How HTML Pages Are Generated 82
- START:Calendar { 85
- SPECIAL TASKS 89
- Creating Reusable Components 91
- Simplifying Interfaces 96
- Intercomponent Communication 98
- Parent's Template File 99
- <DocRoot> 105
- Designing for Reusability 106
- Complete Declaration 107
- Partial Declaration 108
- Managing State 109
- Chapter 7 Managing State 112
- Objects and State 113
- State Storage Strategies 120
- Comparison of Storage Options 121
- State in the Server 123
- State in the Page 124
- State in Cookies 126
- Custom State-Storage Options 128
- Controlling Session State 133
- Setting Session Time-Out 134
- Controlling Component State 135
- Adjusting the Page Cache Size 136
- Using awake and sleep 137
- Client-Side Page Caching 139
- Chapter 8 141
- Choosing a Strategy 143
- Objective-C Java 146
- Chapter 9 149
- Maintaining a Log File 151
- Accessing Statistics 152
- Recording Extra Information 153
- Error Handling 154
- Performance Tips 156
- Compile the Application 157
- Control Memory Leaks 157
- Limit State Storage 158
- Limit Database Fetches 158
- Limit Page Sizes 158
- Installing Applications 159
- WEBSCRIPT 161
- The WebScript Language 163
- Objects in WebScript 165
- WebScript Language Elements 166
- Variables and Scope 167
- Assigning Values to Variables 168
- Invoking Methods 171
- Accessor Methods 171
- Sending a Message to a Class 172
- Creating Instances of Classes 173
- Data Types 174
- Statements and Operators 175
- Control-Flow Statements 176
- Arithmetic Operators 176
- Logical Operators 176
- Relational Operators 176
- Reserved Words 178
- “Modern” WebScript Syntax 179
- Advanced WebScript 181
- Categories 182
- Objective-C WebScript 183
- Chapter 11 187
- Foundation Objects 189
- Determining Equality 190
- Working With Strings 191
- Commonly Used String Methods 192
- Comparing Strings 194
- Converting String Contents 194
- Modifying Strings 195
- Storing Strings 195
- Working With Arrays 196
- Commonly Used Array Methods 196
- Creating Arrays 197
- Querying Arrays 197
- Sorting Arrays 198
- Adding and Removing Objects 198
- Working With Dictionaries 200
- Creating Dictionaries 202
- Querying Dictionaries 203
- Storing Dictionaries 205
- Working With Dates and Times 206
- Commonly Used Date Methods 207
- Representing Dates as Strings 208
- Retrieving Date Elements 208
- – minuteOfHour 209
- – secondOfMinute 209
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