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# TypeScript - enum type

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In TypeScript it is possible to create enum type in following ways.

## 1. Automatic numeric `enum` members example

``````enum Color
{
Red,   // 0
Green, // 1
Blue   // 2
}

let blue : Color = Color.Blue;

console.log(Color.Red);
console.log(Color.Green);
console.log(blue);``````

Output:

``````0
1
2``````

## 2. Computed and constant `enum` members example

``````enum Mode
{
Write = 1 << 2,
}

console.log(Mode.Write);
console.log(Mode.Both);``````

Output:

``````2
4
6``````

## 3. Assigned numeric `enum` members example - auto counting

``````enum Value
{
Two = 2,
Three, // 3
Four,  // 4
Six = 6,
Seven  // 7
}

let two : Value = Value.Two;

console.log(two);
console.log(Value.Three);
console.log(Value.Seven);``````

Output:

``````2
3
7``````

## 4. String `enum` members example

``````enum Pet {
Dog = 'Dog',
Cat = 'Cat',
Rabbit = 'Rabbit'
}

let dog : Pet = Pet.Dog;

console.log(dog);
console.log(Pet.Cat);
console.log(Pet.Rabbit);``````

Output:

``````Dog
Cat
Rabbit``````

## 5. Generating logic `enum` members example

``````let counter = 0;

enum Key {
A = counter *= 2,
B = counter *= 2,
C = counter *= 2
}

let a : Key = Key.A;

console.log(a);
console.log(Key.B);
console.log(Key.C);``````

Output:

``````1
2
3``````

## 6. Heterogeneous `enum` members example - strings + numbers

``````enum Mix {
Drink = 1,
Food = 2,

Sweet = '1/3',
Normal = '2/3',
Sour = '3/3'
}

let drink : Mix = Mix.Drink;

console.log(drink);
console.log(Mix.Sweet);
console.log(Mix.Sour);``````

Output:

``````1
1/3
3/3``````

## 7. References

1. Enums - Microsoft Docs
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