Web Reference: In this tutorial, you'll learn about the TypeScript object type and how to write more accurate object type declarations. We have cheat-sheets available for both type and interface, if you want a quick look at the important every-day syntax at a glance. Each property in an object type can specify a couple of things: the type, whether the property is optional, and whether the property can be written to. May 12, 2025 · The first section covers TypeScript language features that enable you to implement Object-Oriented Programming (OOP). The second part discusses concepts derived from these features that lead to the four OOP principles: inheritance, polymorphism, encapsulation, and abstraction.
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