Function createEnumKeyMap

createEnumKeyMap<E>(
values: { [key in string | number | symbol]: E[keyof E] },
): EnumNameMap<E>

Create a map object which contains both the property key and value which both map to the key, E[key] => key and E[value] => key.

Type Parameters

E
Identifies the const enum type being mapped

Parameters

values: { [key in string | number | symbol]: E[keyof E] }
The values to populate on the new object

Returns EnumNameMap<E>

A new frozen (immutable) object which contains a property for each key and value that returns the value.

Example

const enum Animal {
   Dog = 0,
   Cat = 1,
   Butterfly = 2,
   Bear = 3
}
const animalMap = createEnumKeyMap<typeof Animal>({
   Dog: Animal.Dog,
   Cat: Animal.Cat,
   Butterfly: Animal.Butterfly,
   Bear: Animal.Bear
});
// You end up with an object that maps everything to the name
animalMap.Dog === "Dog";         // true
animalMap[0] === "Dog";          // true
animalMap["Dog"] === "Dog";      // true
animalMap.Cat === "Cat";         // true
animalMap[1] === "Cat";          // true
animalMap["Cat"] === "Cat";      // true
// Helper function to always return the "Name" of the type of animal
function getAnimalType(type: string | number | Animal) {
    return animalMap[type];
}