TypeScript · Junior · Question 30 of 75

How does `enum Color { Red, Green }` differ from `type Color = 'red' | 'green'`?

✓Correct answer: An enum creates an object at runtime; a literal union exists only in types
2A literal union creates an object at runtime; an enum is only a type
3No difference: the compiler generates the same JavaScript for both

Explanation

A regular enum compiles to a JS object (a numeric one with reverse mapping). A string union adds nothing to the bundle and is compatible with JSON and APIs. Many teams prefer unions or an as const object. Also, enums are incompatible with erasableSyntaxOnly mode.

How does `enum Color { Red, Green }` differ from `type Color = 'red' | 'green'`?

Explanation

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How does enum Color { Red, Green } differ from type Color = 'red' | 'green'?

Explanation

Further reading

Test yourself

How does `enum Color { Red, Green }` differ from `type Color = 'red' | 'green'`?