TypeScript for Beginners - Introduction - Interfaces

The video tutorial explains the creation of objects using object literal syntax and highlights the inconsistency issues that can arise in large applications. It introduces interfaces in TypeScript as a solution to enforce a standard set of rules for objects, functions, arrays, and classes. Interfaces act as a contract, ensuring that objects comply with specified properties and methods. Unlike inheritance in languages like Java, TypeScript interfaces are strictly for defining contracts and are only relevant at compile time. The tutorial also discusses the versatility of interfaces, which can be applied to various programming constructs.

Why might creating objects directly using object literal syntax lead to issues in large applications?

• It is not supported in TypeScript.

• It requires too much memory.

• It can lead to inconsistent object structures.

• It is too complex to implement.

What is the primary purpose of an interface in TypeScript?

• To replace classes in TypeScript.

• To enhance the performance of TypeScript applications.

• To provide a runtime check for object properties.

• To define a contract for objects, functions, arrays, and classes.

How do you define an interface in TypeScript?

• Using the 'class' keyword.

• Using the 'interface' keyword followed by the interface name.

• Using the 'object' keyword.

• Using the 'function' keyword.

What happens to interfaces once TypeScript code is compiled to JavaScript?

• They are erased and do not exist in the JavaScript code.

• They are retained as comments.

• They are converted into functions.

• They are converted into classes.

In addition to objects, what other elements can interfaces be defined for in TypeScript?

• Only functions.

• Functions, arrays, and classes.

• Only objects.

• Only arrays.