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An experiment on real time visualize development tool, inspired by Bret Victor's Inventing on Principle talk and @ermau C# Implementation.

Run a demo

  1. Install Ruby 1.9.3
  2. Clone the source code from
  3. In the app folder, run following commands:
bundle install
foreman start
  1. open your browser at

Install as gem

Install the Gem:

gem install instant

Then in your program:

require 'rubygems'
require 'instant'

runner = "def hello(a); a = 10 + a; end; hello(20)"