Tutorial by Examples: bug

case thing of Cat -> meow Bike -> ride Sandwich -> eat _ -> Debug.crash "Not yet implemented" You can use Debug.crash when you want the program to fail, typically used when you're in the middle of implementing a case ex...

Run-time memory management with Rc can be very useful, but it can also be difficult to wrap one's head around, especially if your code is very complex and a single instance is referenced by tens or even hundreds of other types in many scopes. Writing a Drop trait that includes println!("Droppi...

$ cat hello.sh #!/bin/bash echo "Hello World" $ bash -x hello.sh + echo Hello World Hello World The -x argument enables you to walk through each line in the script. One good example is here: $ cat hello.sh #!/bin/bash echo "Hello World\n" adding_string_to_number=...

WP_DEBUG_LOG is a companion to WP_DEBUG that causes all errors to also be saved to a debug.log log file inside the /wp-content/ directory. This is useful if you want to review all notices later or need to view notices generated off-screen (e.g. during an AJAX request or wp-cron run). //enable defi...

WP_DEBUG_DISPLAY is another companion to WP_DEBUG that controls whether debug messages are shown inside the HTML of pages or not. The default is 'true' which shows errors and warnings as they are generated. Setting this to false will hide all errors. This should be used in conjunction with WP_DEBUG_...

SCRIPT_DEBUG is a related constant that will force WordPress to use the "dev" versions of core CSS and JavaScript files rather than the minified versions that are normally loaded. This is useful when you are testing modifications to any built-in .js or .css files. Default is false. //enab...

The following code, inserted in your wp-config.php file, will log all errors, notices, and warnings to a file called debug.log in the wp-content directory. It will also hide the errors so they do not interrupt page generation. // Enable WP_DEBUG mode define( 'WP_DEBUG', true ); // Enable Debug...

You made a great app and tested it in Debug, with good results. Everything was working fine! But then, you decided to prepare your app for release. You set up MultiDex, ProGuard and Linker, and then, it stopped working. This tutorial aims to help you to find out common problems related to ProGuard...

DEBUG command was used to create binaries/executabled from batch file. The command is still available in 32bit versions of windows , but is able to create binaries only with 16bit instructions with makes it unusable for 64bit machines. Now CERTUTIL is used for that purpose which allows to decode/enc...

The debug component enables component-to-DOM serialization. <a-scene debug></a-scene> Component-to-DOM Serialization By default, for performance reasons, A-Frame does not update the DOM with component data. If we open the browser’s DOM inspector, we will see only the component names...

pry is a powerful tool that can be used to debug any ruby application. Setting up a ruby-on-rails application with this gem is very easy and straightforward. Setup To start debugging your application with pry Add gem 'pry' to the application's Gemfile and bundle it group :development, :test ...

As recently Apple rolled out iOS11 and Xcode-9, we can now debug apps on devices without connecting devices to Xcode through USB. We can take advantage of wireless debugging feature added to this Xcode-9. To enable wireless debugging, we have to configure some steps in Xcode. 1 First connect the ...

> Run and Debug in Chrome To run the ionic project use below command in terminal or cmd or CLI $ ionic serve For debugging the ionic project ,Firstly you should add extension (Debugger for chrome) and then configure launch.json file like this. { "version": "0...

There are 2 way of enabling internal debugging in log4net: Specify the log4net.Internal.Debug option in the application's config file Enable log4net's internal debug programmatically Specify the log4net.Internal.Debug option in the application's config file This is the preferred method to en...

Using Line Numbers ... and documenting them in case of error ("The importance of seeing Erl") Detecting which line raises an error is a substantial part of any debugging and narrows the search for the cause. To document identified error lines with a short description completes a successf...