TYPESCRIPT Free Section Starter Challenge 20 min

3. Union Types & Literal Enums

Overview: Restrain values with union types `type Status = "draft" | "published" | "archived"`.

Concept & Syntax Guide

Union types let you accept one of several specific values, replacing error-prone raw strings with compile-time checked constants.

Hands-On Practice Exercise

Validate Order License Type

Define a type `type License = "single" | "agency";` and write a function `getLabel(l: License)` that returns the string.

Target Output: Agency Unlimited

Need a hint? Click here to reveal

Hint: Check syntax carefully and make sure your code contains: Agency Unlimited

TYPESCRIPT Code Editor

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type License = 'single' | 'agency';

function getLicenseLabel(lic: License): string {
  return lic === 'single' ? 'Single Use License' : 'Agency Unlimited';
}

console.log(getLicenseLabel('agency'));