Exercise: a validation error

Write an error class ValidationError and a function function validateUser(user) that checks data from a form. The call new ValidationError(message, field) creates an instance of Error whose message is the given text, field is the name of the wrong form field, and name is "ValidationError". The function validateUser gets an object with the properties name and age. If the name is empty, it throws a ValidationError with field equal to "name". If the age is less than 0 or greater than 150, it throws a ValidationError with field equal to "age". Otherwise the function returns true.

• validateUser({ name: "Ann", age: 0 }) → true
• validateUser({ name: "", age: 30 }) → throws a ValidationError with field equal to "name"
• new ValidationError("too old", "age").name → "ValidationError"

Constraints: name is always a string, age is always a whole number, the limits 0 and 150 are allowed, and each test has at most one wrong property.

Do not add extra imports unless the task says so explicitly.