TypeScript Fundamentals: Interfaces & Aliases

by Kwiz

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What are the main benefits of using a type alias?

type Second = number;

let timeInSecond: number = 10;
let time: Second = 10;

We are able to give a type a nameIt helps us make our code D.R.Y.Type aliases allow for declaration mergingA type can be reopened to add new properties

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Type aliases are limited to primitive values only

True

False

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Types in TypeScript can be self-referential

type NumVal = 1 | 2 | 3 | NumVal[];

True

False

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Interfaces can extend from other interfaces

True

False

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Interfaces can extend from classes

True

False

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Unlike type aliases, TypeScript interfaces are used to describe object & object sub-types (arrays, functions) only

True

False

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We should use interfaces to describe primitive types

True

False