They define the data a variable can hold.

A variable can hold multiple types.

TypeScript Types - Learn TYPESCRIPT | Revochamp

Name: TypeScript Types
Availability: InStock
Author: Revochamp

What are Types?

Types in TypeScript define the kind of data a variable can hold, ensuring type safety and better code quality.

Primitive Types

TypeScriptRead-only

let name: string = 'John';
let age: number = 25;
let isActive: boolean = true;

let name: string = 'John';
let age: number = 25;
let isActive: boolean = true;

Array Types

TypeScriptRead-only

let nums: number[] = [1, 2, 3];
let names: Array<string> = ['A', 'B'];

let nums: number[] = [1, 2, 3];
let names: Array<string> = ['A', 'B'];

Tuple

TypeScriptRead-only

let user: [string, number] = ['John', 30];

let user: [string, number] = ['John', 30];

Enum

TypeScriptRead-only

enum Role {
  Admin,
  User,
  Guest
}

enum Role {
  Admin,
  User,
  Guest
}

Any Type

TypeScriptRead-only

let data: any = 'Hello';
data = 123;

let data: any = 'Hello';
data = 123;

Union Types

TypeScriptRead-only

let id: string | number;
id = 101;
id = 'ABC';

let id: string | number;
id = 101;
id = 'ABC';

Type Aliases

TypeScriptRead-only

type User = {
  name: string;
  age: number;
};

type User = {
  name: string;
  age: number;
};

Best Practices

Use specific types instead of any
Use union types for flexibility
Define reusable type aliases
Keep types simple and readable

Common Mistakes

Overusing any type
Incorrect union usage
Not defining proper types
Ignoring type errors

Conclusion

TypeScript types help create safer and more maintainable code by enforcing data structure and reducing runtime errors.

What are Types?

Types in TypeScript define the kind of data a variable can hold, ensuring type safety and better code quality.

Primitive Types

TypeScriptRead-only

let name: string = 'John';
let age: number = 25;
let isActive: boolean = true;

let name: string = 'John';
let age: number = 25;
let isActive: boolean = true;

Array Types

TypeScriptRead-only

let nums: number[] = [1, 2, 3];
let names: Array<string> = ['A', 'B'];

let nums: number[] = [1, 2, 3];
let names: Array<string> = ['A', 'B'];

Tuple

TypeScriptRead-only

let user: [string, number] = ['John', 30];

let user: [string, number] = ['John', 30];

Enum

TypeScriptRead-only

enum Role {
  Admin,
  User,
  Guest
}

enum Role {
  Admin,
  User,
  Guest
}

Any Type

TypeScriptRead-only

let data: any = 'Hello';
data = 123;

let data: any = 'Hello';
data = 123;

Union Types

TypeScriptRead-only

let id: string | number;
id = 101;
id = 'ABC';

let id: string | number;
id = 101;
id = 'ABC';

Type Aliases

TypeScriptRead-only

type User = {
  name: string;
  age: number;
};

type User = {
  name: string;
  age: number;
};

Best Practices

Use specific types instead of any
Use union types for flexibility
Define reusable type aliases
Keep types simple and readable

Common Mistakes

Overusing any type
Incorrect union usage
Not defining proper types
Ignoring type errors

Conclusion

TypeScript types help create safer and more maintainable code by enforcing data structure and reducing runtime errors.

TypeScript Types

TypeScript Types

What are Types?

Primitive Types

Array Types

Tuple

Enum

Any Type

Union Types

Type Aliases

Best Practices

Common Mistakes

Conclusion

Try it yourself

Test Your Knowledge

Frequently Asked Questions

Need help?

TypeScript Types

TypeScript Types

What are Types?

Primitive Types

Array Types

Tuple

Enum

Any Type

Union Types

Type Aliases

Best Practices

Common Mistakes

Conclusion

Try it yourself

Test Your Knowledge

Frequently Asked Questions

Need help?