Converting NSDictionary to NSArray

Question

Whats the difference between, these two syntax to convert NSDictionary to NSArray?

//replyInfo is NSDictionary

     NSArray *values=[[NSArray alloc]init];
     values = [replyInfo valueForKey:@"response"];//when this?
     values = [replyInfo allValues];//when this?

Answer 1

values = [replyInfo valueForKey:@"response"];

This gives you value for particular key from dictionary.

Where in values = [replyInfo allValues]; returns a new array containing the dictionary’s values

values = [replyInfo allKeys]; will return you array of all keys in dictionary.

When to use:

• When you want to access particular item from dictionary go for

  values = [replyInfo valueForKey:@"response"];
  

• When you want to do something with all values like iterate through all values or somethning go for

  values = [replyInfo allValues];