Reusable type with flexibility.

To write reusable and type-safe code.

TypeScript Generics - Learn TYPESCRIPT | Revochamp

Name: TypeScript Generics
Availability: InStock
Author: Revochamp

What are Generics?

Generics allow you to create reusable components that work with multiple data types while maintaining type safety.

Basic Generic Function

TypeScriptRead-only

function identity<T>(value: T): T {
  return value;
}

function identity<T>(value: T): T {
  return value;
}

Using Generics

TypeScriptRead-only

identity<string>('Hello');
identity<number>(10);

identity<string>('Hello');
identity<number>(10);

Generic Interface

TypeScriptRead-only

interface Box<T> {
  value: T;
}

interface Box<T> {
  value: T;
}

Generic Class

TypeScriptRead-only

class DataStore<T> {
  data: T[] = [];

  add(item: T) {
    this.data.push(item);
  }
}

class DataStore<T> {
  data: T[] = [];

  add(item: T) {
    this.data.push(item);
  }
}

Generic Constraints

TypeScriptRead-only

function printLength<T extends { length: number }>(item: T) {
  console.log(item.length);
}

function printLength<T extends { length: number }>(item: T) {
  console.log(item.length);
}

Multiple Generics

TypeScriptRead-only

function pair<K, V>(key: K, value: V) {
  return { key, value };
}

function pair<K, V>(key: K, value: V) {
  return { key, value };
}

Best Practices

Use generics for reusable logic
Keep generic names meaningful (T, K, V)
Use constraints when needed
Avoid overusing generics

Common Mistakes

Using generics unnecessarily
Not defining constraints
Complex generic definitions
Ignoring type safety benefits

Conclusion

Generics make TypeScript code more reusable, flexible, and type-safe, especially in large applications.

What are Generics?

Generics allow you to create reusable components that work with multiple data types while maintaining type safety.

Basic Generic Function

TypeScriptRead-only

function identity<T>(value: T): T {
  return value;
}

function identity<T>(value: T): T {
  return value;
}

Using Generics

TypeScriptRead-only

identity<string>('Hello');
identity<number>(10);

identity<string>('Hello');
identity<number>(10);

Generic Interface

TypeScriptRead-only

interface Box<T> {
  value: T;
}

interface Box<T> {
  value: T;
}

Generic Class

TypeScriptRead-only

class DataStore<T> {
  data: T[] = [];

  add(item: T) {
    this.data.push(item);
  }
}

class DataStore<T> {
  data: T[] = [];

  add(item: T) {
    this.data.push(item);
  }
}

Generic Constraints

TypeScriptRead-only

function printLength<T extends { length: number }>(item: T) {
  console.log(item.length);
}

function printLength<T extends { length: number }>(item: T) {
  console.log(item.length);
}

Multiple Generics

TypeScriptRead-only

function pair<K, V>(key: K, value: V) {
  return { key, value };
}

function pair<K, V>(key: K, value: V) {
  return { key, value };
}

Best Practices

Use generics for reusable logic
Keep generic names meaningful (T, K, V)
Use constraints when needed
Avoid overusing generics

Common Mistakes

Using generics unnecessarily
Not defining constraints
Complex generic definitions
Ignoring type safety benefits

Conclusion

Generics make TypeScript code more reusable, flexible, and type-safe, especially in large applications.

TypeScript Generics

TypeScript Generics

What are Generics?

Basic Generic Function

Using Generics

Generic Interface

Generic Class

Generic Constraints

Multiple Generics

Best Practices

Common Mistakes

Conclusion

Try it yourself

Test Your Knowledge

Frequently Asked Questions

Need help?

TypeScript Generics

TypeScript Generics

What are Generics?

Basic Generic Function

Using Generics

Generic Interface

Generic Class

Generic Constraints

Multiple Generics

Best Practices

Common Mistakes

Conclusion

Try it yourself

Test Your Knowledge

Frequently Asked Questions

Need help?