TypeScript Arrays

TypeScript Arrays

TypeScript adds type safety to arrays so you can’t accidentally insert the wrong type.

 Declaring Arrays

Method 1: Using type[]

Method 2: Using Array<type>

• Both are valid (first is more common).

Array with Type Inference

TypeScript automatically infers array types.

Error:

 Mixed Type Arrays (Union Types)

Use union types to allow multiple types.

Array of Objects

 Readonly Arrays

Prevent array modification.

 Not allowed:

Tuple vs Array

Tuple has fixed length & types, array doesn’t.

 Common Array Methods (Type-Safe)

TypeScript ensures:

•  Correct return types
•  Correct input

Multidimensional Arrays

 Array with any (Avoid)

•  Avoid unless absolutely needed.

 Arrays Summary

Best Practices

•  Prefer type[] syntax
•  Avoid any[]
•  Use union types for mixed arrays
• Use readonly when modification isn’t needed