Function equalsOneOf

equalsOneOf<T extends string>(str: string, strings: readonly T[]): undefined | T
Returns the string that matches the string (if it exits). Great for matching string union types.
Type Parameters
- T extends string
Parameters
- str: string
- strings: readonly T[]
Returns undefined | T
Usage
```
const methods = ['GET', 'PUT', 'POST', 'PATCH', 'DELETE'] as const;

const methodStr: string = 'GET';

const method = equalsOneOf(methodStr, methods);

if (method) {
 // if method was just a string this would be a type error
	methods.includes(method)
}
```
- Defined in strings.ts:21