Is it necessary to assign a string to a variable before comparing it to another

Question

I want to compare the value of an NSString to the string  Wrong    Here is my code   NSString  wrongTxt     NSString alloc  initWithFormat   Wrong    if   statusString isEqualToString wrongTxt          doSomething      Do I really have to create an NSString for  Wrong    Also  can I compare the value of a UILabel s text to a string without assigning the label value to a string

User · Answer

if   statusString isEqualToString   Wrong             do something

User · Answer

Do I really have to create an NSString for  Wrong     No  why not just do   if  statusString isEqualToString   Wrong           doSomething      Using     simply creates a string literal  which is a valid NSString      Also  can I compare the value of a UILabel text to a string without assigning the label value to a string    Yes  you can do something like   UILabel  label        if  someString isEqualToString label text            Do stuff here

User · Answer

Brian  also worth throwing in here - the others are of course correct that you don t need to declare a string variable   However  next time you want to declare a string you don t need to do the following   NSString  myString     NSString alloc  initWithFormat   SomeText      Although the above does work  it provides a retained NSString variable which you will then need to explicitly release after you ve finished using it   Next time you want a string variable you can use the     symbol in a much more convenient way   NSString  myString     SomeText     This will be autoreleased when you ve finished with it so you ll avoid memory leaks too     Hope that helps

User · Answer

You can also use the NSString class methods which will also create an autoreleased instance and have more options like string formatting   NSString  myString    NSString stringWithString   abc    NSString  myString    NSString stringWithFormat   abc  d efg   42

[objective-c] Is it necessary to assign a string to a variable before comparing it to another?

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