Interactive Programming - REPL “read-eval-print loop” execution paradigm

About

REPL (an acronym for “read-eval-print loop”) is a execution paradigm implemented in a command line interpreter that:

• reads what you type (i.e.
  • a statement for a language
  • a command for an OS Shell
• evaluates it,
• and prints the result if any.

A REPL console is a synonym for a command line interpreter.

Articles Related

Implementation

Steps:

• Prompt the user for some code,
• When they’ve entered it, execute it in the same process.

while True:
    code = input(">>> ")
    exec(code)

it’s much more complex, because it has to deal with:

• multi-line code,
• tab completion (using readline for instance),
• magic commands,
• and so on.

Library

Implementation

Java:

• Spring Shell
• https://github.com/jline/jline3

C:

• Bash - Readline (GNU)
• http://www.thrysoee.dk/editline/

Recorder

• https://asciinema.org/

Documentation / Reference

• wiki/Read–eval–print_loop
• Why is System.out.println so slow?

Source Example

• https://github.com/raxod502/polygott
• https://github.com/raxod502/python-in-a-box
• https://github.com/umesh-timalsina/riju

Base docker image

• https://github.com/replit/polygott

Blog

• https://intuitiveexplanations.com/tech/replit/evidence