DART  PRESENTED BY LENZ PAUL  MARCH 20 2024 linkedin.com/in/lenztpaul @lenztpaul

AGENDA  Basics of generics  Genericssyntax  How to use them in your code and  Conventions on Type variables  Benefits of using generics  Demo

THE ❑Generics are placeholders for types ❑Defined within brackets 3

DART LIST – A GENERIC ARRAY ❑Dart List is a generic ❑You can create a list of any type

USING GENERICS

RESTRICTING THE PARAMETERIZED TYPE ❑Type constraints limit the types that can be used as arguments for a generic type. ❑Specify type constraints using the `extends` keyword ❑Restricts the usability of the generic class to ensure it operates on a set of types with common functionality ❑Aids in creating more specific and descriptive APIs by communicating the intended use of the generic type.

THE TYPE VARIABLE BY CONVENTION ❑ Single letter for generics that have a single type parameter, e.g. T,S,U ❑ E for the element type in a collection ❑ K and V for the key and value types in an associative collection ❑R for a type used as the return type

CONSIDER DESCRIPTIVE NAME

WHY GENERICS? ❑ Improved Code Reusability: Generics allow you to write a single piece of code that can work with many different data types. ❑ Enhanced Type Safety: Generics help to prevent errors by ensuring that the data types used in your code are compatible. This can lead to more robust and reliable code. ❑ Better Performance: The Dart compiler can generate more efficient code for generic functions and classes. 9

TYPE SAFETY ❑Ensures variables hold only data of their designated type ❑Helps avoid common type-related errors in code ❑Compile-time checks for type consistency ❑Prevents the possibility of runtime type errors 10

REUSABILITY  Enables the creation of flexible, reusable components  Allows for defining generic classes and functions that work with any type  Reduces code duplication by providing a single implementation that can operate on different data types  Enhances code maintainability and reduces errors by centralizing logic

DEMO Repository pattern in Dart using generics