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This tutorial helps broaden your basic knowledge of debugging by providing you with a different approach and tool for debugging in Ruby.
Before we begin I will like us to establish some common ground. A basic understanding of the following is required:
Before we begin I will like us to establish some common ground. A basic understanding of the following is required:
Introduction
Pry was and is still being developed by John Mair (project founder; aka banisterfiend; twitter; blog), Conrad Irwin and Ryan Fitzgerald. It is also aided by a healthy number of contributors. Zoo tycoon dinosaur digs download mac.
Simply put, Pry is IRB on steroids. With Pry, you get all the features of IRB, plus some more. Besides being able to intercept sessions and perfom REPL-like actions in your terminal, you are also able to use your command shell integrations.
Pry can do quite a number of things; however, for the sake of this tutorial, we will focus on using pry to debug.
To set up pry on your machine, run the
gem install pry
command. This would fetch pry
from rubygems.orgBasic Usage
Pearl necklace lisa annapolis. As mentioned above, you can use pry to intercept your session and evaluate each method call during the interception , https://multiever157.weebly.com/blog/download-virtual-villagers-free-mac.
Here we have a class,
Greet
, that greets people in several languages as shown below:You probably noticed that we have a typo in the Deutch method.
If we try to get Deutch greeting by calling the method using
Greet.deutch('John Doe')
, you'll get an undefined local variable or method 'usernme'
https://renewhand503.weebly.com/hamad-hospital-qatar-residency-program.html. error.If we put pry here, we would be able to evaluate each method individually.
In order to use pry, we must put it into the file we're working with and 'bind' it at the specific point we want to intercept.
In this case, we will have
When we run the file again using the Deutch Greeting,
Greet.deutch('John Doe')
, a pry session is initiated. We would be able to access all the methods and arguments in the class.The application of this are not limited to method calls or accessing variables alone. To exit your pry session, you can enter the command
exit
or ctrl + D
.Doing More with Pry
American red cross handbook on first aid software online. What if we could inspect all the local variables in our code snippet within our pry session?
It's a lot right? With the above, you do not neccesarily have to know all of Ruby's string methods by heart. However, I recommend you to look into each one of the methofs to know when and when not to use them. Ruby Doc is very useful in this regard. Kudos to you if you already know all these methods by heart! I honestly wouldnt mind buying you coffee if you're in the neighbourhood!
You can use the approach above to look into the internals of both your File and Exception classes. https://elderskyey858.weebly.com/blog/mac-file-recovery-software-freeware.
To do that, we must modify our pry session for this hedgecase:
The above is extremely useful when you're trying to debug complex projects and scripts. You can also check last exception message by using the
wtf
command in pry. The backtrace will help seek out the origination of your bug.![Advanced Kv Checker 2017 Advanced Kv Checker 2017](/uploads/1/3/3/2/133296530/999470652.jpeg)
Using pry in Loops
Imagine a simple method that takes an array argument and outputs a hash with the names of students and an assigned serial number to each students.
Such a method will look like the one we have below:
Using the conditional, you can specify at what point you want to intercept your code and initiate a pry session.
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We only covered some of the basic things pry can do — imagine how much more you can accomplish when you use Pry with Rails.
Yes, pry is awesome, but it doesn't just end here! In the second part of this series, we will combine pry with steering and pry with rails.
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