identity 
Returns the input value unchanged.
Signature 
typescript
function identity<T>(x: T);Parameters 
- x(- T): The value to be returned.
Returns 
(T): The input value.
Examples 
typescript
// Returns 5
identity(5);
// Returns 'hello'
identity('hello');
// Returns { key: 'value' }
identity({ key: 'value' });
