Objective-C > NSArray

1. Declare a new NSMutableArray object named "username":

NSMutableArray *username = [NSMutableArray arrayWithObjects: @"Peter",@"Mary", @"John", @"David" ,@"Susan", nil];

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2. Common class method [ + ] and instance methods [ - ]:

+	array
+	arrayWithObjects
-	(NSUInteger) count
-	objectAtIndex: (NSSInteger) index
-	(void) addObject: (id) anObject
-	(void) insertObject: (id) anObject atIndex: (NSUInteger) index
-	(void) removeLastObject
-	(void) removeObjectAtIndex: (NSUInteger) index
-	(void) removeAllObjects
-
-

+: Class Method: 無須實體化就可以使用的方法 (生仔用only)
-: Instance Method: 需先實體化才可以使用的方法，假設str1 已經是NSString 文字實體 (生完仔, 對仔落指令)

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[+] arrayWithObjects: (NSString *) format

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[-] (NSUInteger) count

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[-] (NSUInteger) objectAtIndex: (NSSInteger) index

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[-] (void) addObject: (id) anObject

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[-] (void) insertObject: (id) anObject atIndex: (NSUInteger) index

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[-] (void) removeLastObject

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[-] (void) removeObjectAtIndex: (NSUInteger) index

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[-] (void) removeAllObjects

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Reference: https://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSMutableArray_Class/Reference/Reference.html#//apple_ref/occ/instm/NSMutableArray/removeAllObjects

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<Exercises>
NSMutableArray
1a. Verify that the Foundation array classes are bounds checked:

• Create an NSMutableArray and populate it with three NSString objects.
• Using the method objectAtIndex:, try to retrieve an object from index -1.

1b. Try again with index 3. What happens?

• Using the method insertObject:atIndex:, try to insert another NSString at index -1. What happens?
• Now try to insert the new string at index 3. Explain your results.

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Sort an NSArray
1. Create an NSArray that holds the following strings: @"Raspberry", @"Peach", @"Banana", @"Blackberry", @"Blueberry", and @"Apple".
2. Obtain a sorted version of the array using the NSArray method sortedArrayUsingSelector:. Use the selector for the NSString method caseInsensitiveCompare: as the argument. You should read the documentation for sortedArrayUsingSelector: and caseInsensitiveCompare:
before proceeding.
3.Log the contents of the newly created sorted array.