Extract constant
The Extract Constant refactoring helps you avoid using hardcoded constants without any explanations about their values or purpose.
Extract a constant
In the editor, select an expression or declaration of a variable you want to replace with a constant.
Press ⌃ ⌥ C to introduce a constant or select from the main or context menu.
If there are several expressions available for extracting, select the required one from the list that opens and press ⏎.
Select a name for the constant from the list of suggestions that opens or type a new one.
Check the Put to header checkbox if you want the constant to be moved to the header file.
Uncheck the Declare static checkbox if you don't want the constant to be declared as
static.Press ⏎.
Code example
Before | After |
|---|---|
@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