TypeScript Basics

Types you write and types the compiler already knows. The blanks are the annotations that change what the next line is allowed to be.

Add type annotations to function parameters, and infer each return type from what the function actually computes.

Define an interface for a User object, inferring each property's type from how the property is used below it.

Use union types to allow a variable to hold multiple types.

Work with typed arrays and array methods in TypeScript.