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  2. Builder pattern - Wikipedia

    en.wikipedia.org/wiki/Builder_pattern

    Disadvantages of the builder pattern include: [3] A distinct ConcreteBuilder must be created for each type of product. Builder classes must be mutable. May hamper/complicate dependency injection. In many null-safe languages, the builder pattern defers compile-time errors for unset fields to runtime.

  3. Async/await - Wikipedia

    en.wikipedia.org/wiki/Async/await

    In the particular case of C#, and in many other languages with this language feature, the async/await pattern is not a core part of the language's runtime, but is instead implemented with lambdas or continuations at compile time. For instance, the C# compiler would likely translate the above code to something like the following before ...

  4. Observer pattern - Wikipedia

    en.wikipedia.org/wiki/Observer_pattern

    The observer design pattern is a behavioural pattern listed among the 23 well-known "Gang of Four" design patterns that address recurring design challenges in order to design flexible and reusable object-oriented software, yielding objects that are easier to implement, change, test and reuse.

  5. Module pattern - Wikipedia

    en.wikipedia.org/wiki/Module_pattern

    This pattern can be implemented in several ways depending on the host programming language, such as the singleton design pattern, object-oriented static members in a class and procedural global functions. In Python, the pattern is built into the language, and each .py file is automatically a module.

  6. Lazy initialization - Wikipedia

    en.wikipedia.org/wiki/Lazy_initialization

    In computer programming, lazy initialization is the tactic of delaying the creation of an object, the calculation of a value, or some other expensive process until the first time it is needed.

  7. Haxe - Wikipedia

    en.wikipedia.org/wiki/Haxe

    It can compile to source code in C++, JavaScript, PHP, C#, Java, Python, and Lua. Haxe also has an interpreter called eval. [17] This same interpreter is also used compile-time to run macros, which allow modification of the abstract syntax tree (AST).

  8. Visitor pattern - Wikipedia

    en.wikipedia.org/wiki/Visitor_pattern

    It should be possible to define a new operation for (some) classes of an object structure without changing the classes. When new operations are needed frequently and the object structure consists of many unrelated classes, it's inflexible to add new subclasses each time a new operation is required because "[..] distributing all these operations across the various node classes leads to a system ...

  9. Comparison of C Sharp and Java - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_C_Sharp_and_Java

    The designers chose to address this problem with a four-step solution: 1) Introducing a compiler switch that indicates if Java 1.4 or later should be used, 2) Only marking assert as a keyword when compiling as Java 1.4 and later, 3) Defaulting to 1.3 to avoid rendering prior (non 1.4 aware code) invalid and 4) Issue warnings, if the keyword is ...