Starting on ruby 1.9.3, you have the Module#private_constant method, which seems to be exactly what you wanted: class Person SECRET=’xxx’.freeze private_constant :SECRET def show_secret puts “Secret: #{SECRET}” end end Person.new.show_secret # => “Secret: xxx” puts Person::SECRET # NameError: private constant Person::SECRET referenced
This is advanced behavior which will not be needed in 90+% of the enumerations created. According to the docs: The rules for what is allowed are as follows: _sunder_ names (starting and ending with a single underscore) are reserved by enum and cannot be used; all other attributes defined within an enumeration will become members … Read more
Constant pool is a part of .class file (and its in-memory representation) that contains constants needed to run the code of that class. These constants include literals specified by the programmer and symbolic references generated by compiler. Symbolic references are basically names of classes, methods and fields referenced from the code. These references are used … Read more
Use a final class, and define a private constructor to hide the public one. For simplicity you may then use a static import to reuse your values in another class public final class MyValues { private MyValues() { // No need to instantiate the class, we can hide its constructor } public static final String … Read more
Use the constant() function: $id = constant(“ThingIDs::$thing”);
You can use Reflection for this. Note that if you are doing this a lot you may want to looking at caching the result. <?php class Profile { const LABEL_FIRST_NAME = “First Name”; const LABEL_LAST_NAME = “Last Name”; const LABEL_COMPANY_NAME = “Company”; } $refl = new ReflectionClass(‘Profile’); print_r($refl->getConstants()); Output: Array ( ‘LABEL_FIRST_NAME’ => ‘First Name’, … Read more
TypeScript 2.0 has the readonly modifier: class MyClass { readonly myReadOnlyProperty = 1; myMethod() { console.log(this.myReadOnlyProperty); this.myReadOnlyProperty = 5; // error, readonly } } new MyClass().myReadOnlyProperty = 5; // error, readonly It’s not exactly a constant because it allows assignment in the constructor, but that’s most likely not a big deal. Alternative Solution An alternative … Read more