Home - News ( United States | United Kingdom | Italy | Germany ) - Football scores

Showing content from https://www.geeksforgeeks.org/quizzes/type-annotation-and-inference-in-typescript/ below:

Quiz about Type Annotation and Inference in TypeScript

What is Type Annotation in TypeScript?

• A way to assign a default value to a variable

• A method to explicitly declare the type of a variable

• A feature that automatically assigns types to variables

• A way to convert one type into another

What is Type Inference in TypeScript?

• When TypeScript automatically determines the type of a variable

• When TypeScript forces developers to specify types manually

• A process of converting one type to another

• A way to disable type checking

What will be the inferred type of the variable x in the following code?

What happens if you try to assign a string to a variable inferred as a number?

let x = 100;
x = "Hello";

• The code compiles and runs without errors

• TypeScript throws a compilation error

• TypeScript changes the type of x to string

• The value is automatically converted to a number

How do you explicitly declare a function’s return type in TypeScript?

• function add(a: number, b: number) -> number {}

• function add(a: number, b: number): number {}

• function add(a: number, b: number) = number {}

• function add(a: number, b: number) returns number {}

What will be the inferred return type of this function?

function greet() {
  return "Hello, TypeScript!";
}

What will be the inferred type of the variable flag in the following code?

Which of the following types is inferred when a variable is declared without assignment?

How can you explicitly define a variable with multiple possible types?

• let value: multiple<number, string> = 42;

• let value = number | string = 42;

• let value: number | string = 42;

• let value: any = 42 | "hello";

What happens when you use strictNullChecks in TypeScript?

• null and undefined are treated as normal values

• null and undefined cannot be assigned to variables of other types unless explicitly allowed

• TypeScript ignores null values in type checking

• null and undefined behave like numbers

There are 10 questions to complete.

Take a part in the ongoing discussion

RetroSearch is an open source project built by @garambo | Open a GitHub Issue

Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo

HTML: 3.2 | Encoding: UTF-8 | Version: 0.7.4