Exploring `irb`

Start clean

I created an alias irb=irb --sample-book-mode

This removes the complex prompt like irb(main):001:0> and gives plain and simple >> instead.

Get Help!

When programming in Python, even today I use dir in Python REPL. So I was looking for the equivalent in Ruby land.

Turns out I was comparing apples and oranges (so to speak)

As of early 2022, irb has awesome help built-in. It has good autocompletion. So just typing . may be enough to know list of methods available.

Or just help followed by say String (or Array) is enough.

Built-in Help

Remove the clutter

During the initial exploration, irb session quickly gets cluttered.

I instinctively tried clear (as used in shell) - that didn’t work ๐Ÿ˜„

To clear the irb session, use Ctrl+L

You require this

passing -r to irb automatically makes that gem available in irb session.

โžœ irb -rpp
>> pp $LOAD_PATH

(โ˜ example may be old. In my case, $LOAD_PATH๏ธ was automatically pretty-printed ๐Ÿ˜„)

Time to go

Ctrl+D works for both python REPL and irb

In python you require () to call a function

โžœ python
Python 3.8.12 (default, Sep 16 2021, 22:00:28)
[Clang 12.0.0 (clang-1200.0.32.29)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> exit
Use exit() or Ctrl-D (i.e. EOF) to exit

In Ruby, it is optional. So both exit() or simply exit works! ๐Ÿ‘