How do I combine two TypeScript enums?

How do I combine two enums in TypeScript?

If you want to merge your 2 enums you have ~3 choices:

  1. Using string enums. enum Mammals { Humans = ‘Humans’, Bats = ‘Bats’, Dolphins = ‘Dolphins’ } enum Reptiles { Snakes = ‘Snakes’, Alligators = ‘Alligators’, Lizards = ‘Lizards’ } export const Animals = { … …
  2. Using unique numbers. …
  3. Using nested enums.

Can enum extend another enum TypeScript?

Currently, You can’t extend enum in TypeScript.

Are enums bad in TypeScript?

Enums in TypeScript are a very useful addition to the JavaScript language when used properly. They can help make it clear the intent of normally “magic values” (strings or numbers) that may exist in an application and give a type safe view of them.

How do enums work in TypeScript?

Enums or enumerations are a new data type supported in TypeScript. Most object-oriented languages like Java and C# use enums. This is now available in TypeScript too. In simple words, enums allow us to declare a set of named constants i.e. a collection of related values that can be numeric or string values.

How do I create a map in typescript?

Example

  1. let map = new Map();
  2. map.set(‘1’, ‘abhishek’);
  3. map.set(1, ‘www.javatpoint.com’);
  4. map.set(true, ‘bool1’);
  5. map.set(‘2’, ‘ajay’);
  6. console.log( “Value1= ” +map.get(1) );
  7. console.log(“Value2= ” + map.get(‘1’) );
  8. console.log( “Key is Present= ” +map.has(3) );

Can enums be extended?

No, we cannot extend an enum in Java. Java enums can extend java. lang. Enum class implicitly, so enum types cannot extend another class.

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Can we extend enum in C#?

Yes, you can easily define a enumeration extending existing enum. When you extend the LinearGradientMode enum (which has value 0 to 3), it’s ok.

Can you extend an enum Swift?

We can extend the enum in two orthogonal directions: we can add new methods (or computed properties), or we can add new cases. Adding new methods won’t break existing code. Adding a new case, however, will break any switch statement that doesn’t have a default case.

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