REPL vs CLI: IDE wars

Post by bookofsand » Thu, Jul 01, 2021, 6:51 PM UTC

dec0dedab0de wrote: post #56

bookofsand wrote: post #35

Earlier quoted context omitted.

Step1: Write a test. Step2, IDE: Right click + Run. Step2, CLI: $ run Bonus: The test is now part of your automated test suite, and will be ran many times to ensure things don't break.

What if you don't know what you want it to do yet? Maybe you have a new API or library you're working with and the documentation is lacking. Maybe you're exploring some dataset trying to figure out what kind of information can be gleaned from it. Maybe it takes 3 minutes to get it into the state where it failed, so instead of starting over every change you just want to modify the one function over and over. Doing it…

Post by BoxOfRain » Thu, Jul 01, 2021, 7:32 PM UTC

winrid wrote: post #21

smw wrote: post #4

I think you might be missing the main "aha!" of clojure REPLs vs REPLs in non-homoiconic languages: you can very easily execute small parts of the program you're editing without re-typing the code. In emacs, for instance, you often use `eval-last-sexp`, by default bound to C-x C-e. This lets you move your cursor to a particular point in the file, often deep in a function, and get the results of just the form(s) you'r…

You can do this in IDEA's IDEs too, just place a breakpoint and then you can "evaluate expression" in that context to call functions, read values, etc.

Post by keymone » Thu, Jul 01, 2021, 7:37 PM UTC

winrid wrote: post #21

smw wrote: post #4

I think you might be missing the main "aha!" of clojure REPLs vs REPLs in non-homoiconic languages: you can very easily execute small parts of the program you're editing without re-typing the code. In emacs, for instance, you often use `eval-last-sexp`, by default bound to C-x C-e. This lets you move your cursor to a particular point in the file, often deep in a function, and get the results of just the form(s) you'r…

You can do this in IDEA's IDEs too, just place a breakpoint and then you can "evaluate expression" in that context to call functions, read values, etc.

Post by AceJohnny2 » Thu, Jul 01, 2021, 7:53 PM UTC

godshatter wrote: post #34

> Don’t forget the set -euo pipefail at the beginning of your script. What does -euo means? I don’t know, I copy-pasted it and man set said there is no manual entry for set. Use "man bash" to find the list of built-in commands. Scroll way down, or search for "SHELL BUILTIN COMMANDS". The "e" command-line switch to the set command tells the script to exit immediately if there is a non-zero return value. The "u" switch…

Post by utxaa » Thu, Jul 01, 2021, 8:31 PM UTC

simiones wrote: post #50

smw wrote: post #4

I think you might be missing the main "aha!" of clojure REPLs vs REPLs in non-homoiconic languages: you can very easily execute small parts of the program you're editing without re-typing the code. In emacs, for instance, you often use `eval-last-sexp`, by default bound to C-x C-e. This lets you move your cursor to a particular point in the file, often deep in a function, and get the results of just the form(s) you'r…

The homoiconicity of Lisp is not what gives it this superpower. It is rather Lisp's dynamic nature that actually allows you to keep running your project while also developing it that is crucial - something that Clojure running on the JVM can actually only approximate. For example, in a full CL, you can modify a class that is currently being used, and objects of that class will adjust accordingly (for most modificatio…