如何在 Ruby 2.0 中使用调试器？

Question

I know the debugger gem is not and never will be compatible with ruby 2.0 per " officially support ruby 2.X ".

In the changelog of Ruby 2.0 is:

Debug support

DTrace support, which enables run-time diagnosis in

production TracePoint, which is an improved tracing API

Is there something out of the box for debugging with Ruby 2.0? Can somebody explain this to me?

Answer 1

The debugger gem can be used but it still has issues.

Install byebug which was written for Ruby 2.0 debugging.

For breakpoints, use the byebug command in your code instead of debugger .

Answer 2

Version 1.4.0 of the debugger gem now installs without problems. There are still some issues but this should be fixed soon.

The debugger gem does not play well with Ruby 2. Instead, install the Byebug gem that is fully compatible with Ruby 2.

Answer 3

Use pry :

gem install pry  
gem install pry-debugger

See " Debugging Ruby With Pry ".

Answer 4

debug.rb (aka binding.break)

Consider using a new Ruby debugging tool called debug.rb .

It supports syntax highlighting and many more out-of-the-box.

Also, it is worth mentioning that it is developed by the Ruby core team.

Just place binding.break anywhere in your codebase.

Here is an example:

Also, it is a default Rails debugger starting from version 7 .

Notes:

• Do not forget about require 'debug'
• q # quit command

Sources:

• debug.rb
• Modify source code with binding.break (similar to binding.pry or binding.irb)
• Rails 7 replaced byebug with ruby/debug
• Depend on ruby/debug, replacing Byebug