> Why shouldn't a "senior" developer know what a binary tree is? Well, wait a minute. He didn't say it's unreasonable to ask what a binary tree is. He said he

> Why shouldn't a "senior" developer know what a binary tree is? Well, wait a minute. He didn't say it's unreasonable to ask what a binary tree is. He said he was glad he wasn't asked to invert a binary tree on a whiteboard. There's a big difference between those things. I think your reading is uncharitable.