AppCode 2021.2 Help

Extract constant

The Extract Constant refactoring helps you avoid using hardcoded constants without any explanations about their values or purpose.

Extract constant

Extract a constant

  1. In the editor, select an expression or declaration of a variable you want to replace with a constant.

  2. Press ⌃ ⌥ C to introduce a constant or select Refactor | Extract/Introduce | Constant from the main or context menu.

  3. If there are several expressions available for extracting, select the required one from the list that opens and press .

  4. Select a name for the constant from the list of suggestions that opens or type a new one.

  5. Check the Put to header checkbox if you want the constant to be moved to the header file.

  6. Uncheck the Declare static checkbox if you don't want the constant to be declared as static.

  7. Press .

Code example

BeforeAfter
@implementation PasswordValidator + (BOOL)isPasswordValid:(NSString *)password { // 4 will be extracted to a constant return password.length > 4; } @end
// Extracted constant static const int kMinPasswordLength = 4; @implementation PasswordValidator + (BOOL)isPasswordValid:(NSString *)password { return password.length > kMinPasswordLength; } @end
    Last modified: 23 July 2021