CODEWITHSUNDEEP
iosobjective-c
Muhammad Waqas
Muhammad Waqas

Reputation: 900

NSDictionary key/value Concepts

i have a Question: when we access an "objectForKey"and the key doesn't exist, this ll return nil but no error/exception, so the question is that after this statement/line is executed, does the runtime system creates a key with the name specified and set it nil OR although nil is the output but no such key is created????

Upvotes: 0

Views: 137

Answers (3)

Kevin Machado
Kevin Machado

Reputation: 4187

You can Log your dictionary after the line executed to see it.

You will see that NSDictionary is immutable, it won't modify your dictionary. ;)

Upvotes: 0

GoodSp33d
GoodSp33d

Reputation: 6292

No it wont modify the dictionary. If the key does not exist then it simply returns nil value.

To confirm this you can set a breakpoint in Xcode for an invalid key and check if dictionary is modified or not. (And moreover NSDictionary is immutable i.e you cannot add/remove objects)

Upvotes: 1

trojanfoe
trojanfoe

Reputation: 122458

In a word: No.

NSDictionary is immutable and objectForKey is a method on the NSDictionary class.

Upvotes: 1

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