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Generics in Dart

3 min readMar 30, 2025

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Generics in Dart allow you to write flexible and reusable code by enabling parameterization of types. This means you can define classes, methods, and functions that work with different data types while ensuring type safety at compile time.

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Benefits of Using Generics

  1. Type Safety — Ensures that only the expected data type is used, reducing runtime errors.
  2. Code Reusability — Allows writing general-purpose code without duplicating logic for different data types.
  3. Better Performance — Avoids unnecessary type conversions and casting, making the code more efficient.
  4. Improved Readability — Provides clarity by explicitly stating the data type being used.

Using Generics in Dart

1. Generic Classes

A class can be parameterized with a type using angle brackets (<>).

class Box<T> {
T value;

Box(this.value);

void showType() {
print("The type of value is…

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Usama Sarwar
Usama Sarwar

Written by Usama Sarwar

Helping founders turn ideas into market-ready web and mobile apps within 30 days using Google’s Flutter & Next.js without juggling multiple teams.

Dart Tutorials
Dart Tutorials

Published in Dart Tutorials

Dart Tutorials for beginners and advanced programmers