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Conditional Types Development Tutorials, Guides & Insights

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TypeScript Generics and Advanced Types Cheatsheet: Master Complex Type Systems

Cheatsheet August 20, 2024
typescript

Intersection types combine multiple types into one. An object of an intersection type must satisfy all the combined types.

interface Person {
  name: string;
}

interface Employee {
  employeeId: number;
}

type EmployeePerson = Person & Employee;

const john: EmployeePerson = {
  name: 'John Doe',
  employeeId: 1234,
};

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Advanced TypeScript: Type Inference and Advanced Types

Tutorial August 05, 2024
typescript 

function add(a: number, b: number) {
  return a + b; // inferred return type is number
}

let numbers = [1, 2, 3]; // inferred as number[]
const handler = (event: MouseEvent) => {
  console.log(event.button); // inferred as MouseEvent
};

window.onclick = handler;

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