I worked with a 60K LOC thing* that talked to multiple services and had complex configuration. Ran fine on my laptop pointed at the company's dev env.
The REPL let me test my changes while inside the thing as it ran. No problems. Someone wrote a nice *recording* debugger too which helped immensely -- no more "oops, I'm past the interesting part and have to start over"
* in prod we usually give it a small number of large instances
The REPL let me test my changes while inside the thing as it ran. No problems. Someone wrote a nice *recording* debugger too which helped immensely -- no more "oops, I'm past the interesting part and have to start over"
* in prod we usually give it a small number of large instances