You know how in a typical REPL, you’ll make use of the up arrow to repeat a previously executed expression? Dyalog allows you to click on the previously printe

You know how in a typical REPL, you’ll make use of the up arrow to repeat a previously executed expression? Dyalog allows you to click on the previously printed expression, modify it in place and when you hit enter, it’ll evaluate as if entered on the read line. It’s a simple little feature but it makes everything feel so malleable.