REPL

El última línea es un indicador, señalando que el REPL está listo para que se ingrese una instrucción. Si escribe una línea de código y presiona Enter, la REPL muestra el resultado:

kons-9 is that it combines the power of a software development IDE with the visual tools of 3D graphics authoring system. It does this by being implemented in Common Lisp, an object-oriented dynamic language which provides powerful facilities for exploratory development and rapid prototyping within a live interactive software environment

REPL-based

So transcriptor aims to do less, and impose the bare minimum of cognitive load needed to convert a REPL interaction into a test. The entire API is four functions:

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<Playground> ```html filename=index.html

> (square: (x: y: square x + square y) 3 7) (x: x*x)58

$ nix repl
nix-repl> (sq: (x: y: sq y + sq x) 2 7) (x: x*x)
53

nix-repl> (sq: (x: y: sq y + sq x)) (x: x*x)     
«lambda @ (string):1:11»

nix-repl> (sq: (x: y: sq y + sq x)) (x: x*x) 2
«lambda @ (string):1:14»

nix-repl> (sq: (x: y: sq y + sq x)) (x: x*x) 2 7
53

nix-repl> (sq: x: y: sq y + sq x) (x: x*x) 2 7   
53

Re-open libraries for exploration I use in-ns to jump into library namespaces and re-define their vars. I insert bits of println statements to help understand how data flows through a library. These monkey-patches only exist in the running REPL. I usually put them inside a comment form. On a REPL restart, the library is back at its pristine state. In this example below, I re-open clj-http.headers to add tracing before the header transformation logic: [source] ;; set us up for re-opening libraries (require 'clj-http.headers) (in-ns 'clj-http.headers) (defn- header-map-request [req] (let [req-headers (:headers req)] (if req-headers (do (println "HEADERS: " req-headers) ;; <-- this is my added print (-> req (assoc :headers (into (header-map) req-headers) :use-header-maps-in-response? true))) req))) ;; Go back to to the user namespace to test the change (in-ns 'user) (require '[clj-http.client :as http]) (http/get "http://www.example.com") ;; This is printed in the REPL: ;; HEADERS: {accept-encoding gzip, deflate} An astute observer will notice this workflow is no different from the regular clojure workflow. Clojure gets out of your way and allows you to shape & experiment in the code in the REPL. You can use this technique to explore clojure.core too!

Unmap namespaces during experimentation I use ns-unmap and ns-unalias to remove definitions from my namespace. These are the complementary functions of require and def. While exploring, you namespace will accrue failed experiments, especially around naming. Instead of using a giant hammer [tools.namespace], you can opt for finer-grained tools like these. Example: (require '[clojure.string :as thing]) (ns-unalias *ns* 'thing) ; *ns* refers to the current namespace