Created
August 8, 2024 06:25
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| interface User { | |
| id: number; | |
| name: string; | |
| email: string; | |
| } | |
| function updateUser(userId: number, updates: Partial<User>) { | |
| // Imagine this function updates a user in the database | |
| console.log(userId, updates); | |
| } | |
| updateUser(1, { name: 'Alice' }); // Works perfectly, 'email' is optional | |
| interface Config { | |
| host?: string; | |
| port?: number; | |
| } | |
| function initializeServer(config: Required<Config>) { | |
| console.log(`Starting server at ${config.host}:${config.port}`); | |
| } | |
| initializeServer({ host: 'localhost', port: 8080 }); // Works fine | |
| initializeServer({ host: 'localhost' }); // Error: Property 'port' is missing | |
| interface Point { | |
| x: number; | |
| y: number; | |
| } | |
| const point: Readonly<Point> = { x: 1, y: 2 }; | |
| point.x = 5; // Error: Cannot assign to 'x' because it is a read-only property | |
| type Status = 'pending' | 'completed' | 'failed'; | |
| const statusMessages: Record<Status, string> = { | |
| pending: 'The task is pending', | |
| completed: 'The task has been completed', | |
| failed: 'The task has failed', | |
| }; | |
| console.log(statusMessages.pending); // 'The task is pending' | |
| interface User { | |
| id: number; | |
| name: string; | |
| email: string; | |
| } | |
| type UserSummary = Pick<User, 'id' | 'name'>; | |
| const userSummary: UserSummary = { | |
| id: 1, | |
| name: 'Alice', | |
| }; | |
| console.log(userSummary); | |
| interface User { | |
| id: number; | |
| name: string; | |
| email: string; | |
| } | |
| type UserWithoutEmail = Omit<User, 'email'>; | |
| const user: UserWithoutEmail = { | |
| id: 1, | |
| name: 'Bob', | |
| }; | |
| console.log(user); | |
| type Status = 'pending' | 'completed' | 'failed'; | |
| type NonFailedStatus = Exclude<Status, 'failed'>; | |
| const status: NonFailedStatus = 'completed'; // Works | |
| const anotherStatus: NonFailedStatus = 'failed'; // Error |
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