Web Reference: We’ll start by reviewing the most basic and common types you might encounter when writing JavaScript or TypeScript code. These will later form the core building blocks of more complex types. Jul 23, 2025 · TypeScript introduces static typing to make code more predictable and easier to debug. Variables are declared using let, const, or var to store data, while data types such as string, number, boolean, array, and enum ensure type safety and improve code reliability. In this lesson, we'll explore how TypeScript handles variables and its type system. You'll learn about variable declaration, type annotations, and the most common types you'll use in your TypeScript programs.
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