When mentoring junior developers, it's important to be available to unblock them. It's equally important to show them how *you* found the answer, so they become empowered
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It feels like rename is by far the most important refactoring operation. If I had an IDE with only one refactoring, I think I'd want rename.
I'm trying to decide what program I should show on the home page of my PL.
Hello World is too simple to show much syntax. Fibonacci is OK but the reader may not know what print(fib(10)) should show.
Maybe print(greet("World")) is better? It gives you a function definition at least.
What are the most interesting upcoming scripting languages? Scripting remains an important part of the programming language ecosystem.
Optimise time to first feature. Allow mutation of the running system to experiment. Interactive inspection of data.