How to check if a given string key exists in Enum?

Question

I have an enum defined like this: ``` export enum someEnum { None = '', value1 = 'value1', value2 = 'value2', value3 = 'value3' } ``` For example, I want to check "value4" key exists in an enum. I should get `false` as value4 is not defined on the enum. I tried `if (someEnum['value4'])` but got an error: Element implicitly has an 'any' type because index expression is not of type 'number'.

Accepted Answer

You could use the `in` operator:

```
if ('value4' in someEnum) {
  // ...
}
```

How to check if a given string key exists in Enum?

Solution

Problem