I was going to say the same thing, but I'll just second you.
When you use "sbt ~run", sbt compiles each file as soon as it changes. I.e., as soon as you save out the editor buffer. By the time you click on the reload button, sbt has usually already compiled all your changes, and it only takes a second or two for either your working page to reload, or for you to see a compiler error message.
When you use "sbt ~run", sbt compiles each file as soon as it changes. I.e., as soon as you save out the editor buffer. By the time you click on the reload button, sbt has usually already compiled all your changes, and it only takes a second or two for either your working page to reload, or for you to see a compiler error message.