Irb which ruby

You can use those in your IRB session exactly like you would in a Ruby program. IRB indicates that this statement returns true , which tells you that the library was loaded successfully. Now type this code into IRB to make a request to icanhazip. Then use the gem command to install the httparty gem:. This time, IRB will display true , letting you know it was able to load the library. Enter this code into IRB to try it out:.

If you start an IRB session and use the -r switch, you can specify libraries or gems you want to load when IRB starts. For example, irb -r httparty would launch an IRB session with the httparty gem already loaded, meaning you can skip the explicit require httparty statement.

However, you can also use this to load your own code into a new session, which is helpful when you want to explore it or test it out. We would use this IPGrabber object in our own program to insulate our code from external changes; using our obect would let us switch out the underlying library and the site we use to resolve the IP address without having to change how the rest of our code works.

Then launch IRB and load this file. By loading your own code into an IRB session, you can inspect code and work with your own libraries before incorporating them into a full program. You can create a configuration file called.

You can then add support for autocompletion, indentation, and command history. First, configure autocompletion support in IRB. With this enabled, the last statements you type will be logged to the. Next, add this line to your configuration file to enable auto-indenting, which is handy when writing classes, methods, and blocks:.

Your configuration file can include any additional valid Ruby code, which means you could define helper methods or use require to load additional libraries. For example, to add a history helper to your IRB session which would show your history, add this code to.

You may have quite a bit, so you can alter the history command so it takes an optional number of lines to show. Replace the code for the history function with this code, which takes an optional argument called count and uses it to limit the entries it displays:. Save the file and start a new IRB session. While you can use. The irb command from your shell will start the interpreter.

Installation Add this line to your application's Gemfile: gem 'irb'. About interactive Ruby Resources Readme. BSDClause License. Releases 34 tags. Packages 0 No packages published.

Used by 1. You signed in with another tab or window. Reload to refresh your session. We can navigate on any line in the method and edit it just like a text editor. It can then be used with ri command to get Ruby documentation. It can be turned on by adding following to. With Ruby 2.