Type Annotations with Arrays
Type Annotations with Arrays in TypeScript refers to the practice of specifying the expected data type of elements within an array. This allows developers to create arrays that can only contain specific types of values, enhancing code reliability and readability while reducing the risk of type-related errors during development.
Example:
let num: number[] = [10, 20, 30, 40, 55, 75];
let city: string[] = ["Chennai",
"Gurugram", "Mumbai", "Hyderabad"];
console.log(num);
console.log(city);
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