I remember at 15 being annoyed that I couldn't figure out a way to have a textbox which I could use to input and run any arbitrary code while my own code was ru

I remember at 15 being annoyed that I couldn't figure out a way to have a textbox which I could use to input and run any arbitrary code while my own code was running to debug it. Like being able to type "println(x)" to get the value of x. Took me a quite few years to discover the intricaties of the so-called debugger :D