Introduction to TypeScript

What is TypeScript?

• TypeScript is a database management system.

• TypeScript is a framework for building web applications.

• TypeScript is a programming language for mobile apps.

• TypeScript is a statically typed superset of JavaScript.

How does TypeScript differ from JavaScript?

• TypeScript does not support object-oriented programming.

• TypeScript is a superset of HTML.

• TypeScript differs from JavaScript by providing static typing and additional features for better code quality.

• TypeScript is only used for backend development.

What is a type in TypeScript?

• A type in TypeScript is a function.

• A type in TypeScript is a comment in the code.

• A type in TypeScript defines the structure and behavior of data.

• A type in TypeScript is a variable name.

What are interfaces in TypeScript?

• Interfaces in TypeScript are a way to define the shape of an object, including its properties and methods.

• Interfaces are a way to create classes in TypeScript.

• Interfaces can only contain properties, not methods.

• Interfaces are only used for defining functions in TypeScript.

What is a class in TypeScript?

• A class in TypeScript is a type of variable.

• A class in TypeScript is a function that returns an object.

• A class in TypeScript is a way to define a constant.

• A class in TypeScript is a blueprint for creating objects that encapsulate data and behavior.

How do you declare a variable in TypeScript?

• const x = 5;

• let x: string = '5';

• let x: number = 5;

• var x: number = 5;

What is a function in TypeScript?

• A function in TypeScript is a reusable block of code that can take inputs and return outputs.

• A function in TypeScript is a way to define classes.

• A function in TypeScript is a data structure for storing values.

• A function in TypeScript is a type of variable.

What is the purpose of the 'any' type?

• The 'any' type is used for defining constants only.

• The 'any' type restricts a variable to a single type.

• The 'any' type allows a variable to hold values of any type, bypassing type checking.

• The 'any' type enforces strict type checking on variables.

How do you create an array in TypeScript?

• var numbers: number = [1, 2, 3];

• let numbers: number[] = [1, 2, 3];

• let numbers = [1, 2, 3];

• const numbers: Array = new Array(1, 2, 3);

What is a module in TypeScript?

• A module in TypeScript is a file that exports code to be used in other files.

• A module in TypeScript is a type of variable.

• A module in TypeScript is a class that cannot be instantiated.

• A module in TypeScript is a function that returns a value.