It's better to give them a coding assignment with a deadline of say 24 or 48 hours. That way they can use resources available to them, just as they would at the

It's better to give them a coding assignment with a deadline of say 24 or 48 hours. That way they can use resources available to them, just as they would at the workplace. Have them submit it to github as a pull request, and you can inspect the quality of the code. Follow up with a phone call to discuss the code and ask questions about it. That way you know the candidate actually wrote the code and you can be confident the quality of it represents the candidate's skills.