But to GPS point, if this is going to be the new production language for this person for the next period, they’re going to lookup how to do this in seconds and

But to GPS point, if this is going to be the new production language for this person for the next period, they’re going to lookup how to do this in seconds and then be an asset to you. Would you really rather have the junior developer who knows the answer to this question off the top of their head, but has so many other lessons to yet learn that GP can bring to the table? Honestly, once a person has demonstrated some proficiency in a cross section of languages, you should just skip the language proficiency section and instead talk about how learning new languages has gone in the past. Look for any red flags or biases that are going to be a hindrance in the new languages particular paradigm, but otherwise the “can you X” is already a done deal.