Type Annotations with Objects
Type Annotations with Objects in TypeScript involve specifying the types of properties within an object. This approach ensures that objects adhere to a specific structure, preventing type-related errors and enhancing code maintainability.
Example: This TypeScript code defines a variable `person` with specific property types. It initializes `person` with values and logs its `name`, `age`, and `isAdmin` properties.
let person: {
name: string;
age: number;
isAdmin: boolean;
} = {
name: "GFG",
age: 22,
isAdmin: false
};
console.log(person.name);
console.log(person.age);
console.log(person.isAdmin);
Conclusion: TypeScript’s type annotations on variables are a powerful tool that enhances code quality by catching type-related errors early in the development process. By providing clear and concise information about the types of variables, developers can write more robust and maintainable code. Whether you are working with primitive types, custom types, or complex data structures, TypeScript’s type annotations can greatly improve your coding experience and contribute to more reliable software.
TypeScript Type Annotations on Variables
TypeScript is a statically typed superset of JavaScript that brings the benefits of strong typing to the JavaScript ecosystem. One of its key features is the ability to add type annotations to variables, which helps developers catch type-related errors at compile time rather than runtime. In this article, we will explore TypeScript type annotations on variables, covering their syntax, and various approaches, and providing code examples for each.
Syntax:
let variableName: type;
Where-
- variableName is the name of the variable
- type is the type you want to assign to it.
These are the following approaches to use Type Annotation in TypeScript:
- Type Annotations with Primitives
- Type Annotations with Arrays
- Type Annotations with Objects