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What is fast enumeration in Objective-C?

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The object is usually a collection such as an array or set Several Cocoa classes, including the collection classes, adopt the NSFastEnumeration protocol. You use it to retrieve elements held by an instance using a syntax similar to that of a standard C for loop, as illustrated in the following example:

NSArray *anArray = // get an array;

for (id element in anArray)

{

/* code that acts on the element */

}

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