Skip to main content

Coding Stories III - JavaScript and Syntactic sugar

Usually people tend to think that if a code has a low number of lines that it will be more easily to read and understand. A similar ideas is that a code that has a fewer number of lines will be faster.
In this post I will focus only on the first idea – code with a low number of line can be read and understand more easily.
JavaScript sample:
displayCustomValue: function (value) {
        return value !== null ? value === 0 ? "ON" : "OFF" : "";
The cool thing is that it has only one line of code –one and powerful line of code. All of us know what a God class is. Based on this, we could say that our line of code from the method is a God line.
When I looked for the first time over this method I said something like: “Ouuhhh! What is the behavior of this method? … Ahhh, IF value is NULL then return an empty string. ELSE, IF the value is 0 then return ON, ELSE return OFF.
Good, now I understood this line of code. Even if the line looks cool, is not so simple to understand and can generate bugs very easily.
When you need to write something like this, don’t think that writing only one line of code will improve the code in one way or another.
value !== null ? value === 1 ? value === 2 ? "? ": "1" : "2" : "null"
I would retrieve our method to something like this:
displayCustomValue: function (value) {
   if ( value === null )
      return "";
   if ( value === 0)
      return "ON"; 
   return "OFF";
Avoid using more than one “? :”  per line in any programming language. Writing code with a lot of “? :” will increase the Ouuhhh factor.


  1. That's from the same family as obfuscated C++ code: very compact, but easy to understand only by people very familiar with that syntax trick.


Post a Comment

Popular posts from this blog

ADO.NET provider with invariant name 'System.Data.SqlClient' could not be loaded

Today blog post will be started with the following error when running DB tests on the CI machine:
threw exception: System.InvalidOperationException: The Entity Framework provider type 'System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer' registered in the application config file for the ADO.NET provider with invariant name 'System.Data.SqlClient' could not be loaded. Make sure that the assembly-qualified name is used and that the assembly is available to the running application. See for more information. at System.Data.Entity.Infrastructure.DependencyResolution.ProviderServicesFactory.GetInstance(String providerTypeName, String providerInvariantName) This error happened only on the Continuous Integration machine. On the devs machines, everything has fine. The classic problem – on my machine it’s working. The CI has the following configuration:

TeamCity.NET 4.51EF 6.0.2VS2013
It seems that there …

How to check in AngularJS if a service was register or not

There are cases when you need to check in a service or a controller was register in AngularJS.
For example a valid use case is when you have the same implementation running on multiple application. In this case, you may want to intercept the HTTP provider and add a custom step there. This step don’t needs to run on all the application, only in the one where the service exist and register.
A solution for this case would be to have a flag in the configuration that specify this. In the core you would have an IF that would check the value of this flag.
Another solution is to check if a specific service was register in AngularJS or not. If the service was register that you would execute your own logic.
To check if a service was register or not in AngularJS container you need to call the ‘has’ method of ‘inhector’. It will return TRUE if the service was register.
if ($injector.has('httpInterceptorService')) { $httpProvider.interceptors.push('httpInterceptorService&#…

Fundamental Books of a Software Engineer (version 2018)

More then six years ago I wrote a blog post about fundamental books that any software engineer (developer) should read. Now it is an excellent time to update this list with new entries.

There are 5 different categories of books, that represent the recommended path. For example, you start with Coding books, after that, you read books about Programming, Design and so on.
There are some books about C++ that I recommend not because you shall know C++, only because the concepts that you can learn from it.


Writing solid codeCode completeProgramming Pearls, more programming pearls(recommended)[NEW] Introduction to Algorithms


Refactoring (M. Fowler)Pragmatic ProgrammerClean code[NEW] Software Engineering: A Practitioner's Approach[NEW] The Mythical Man-Month[NEW] The Art of Computer Programming


Applying UML and Patterns (GRASP patterns)C++ coding standards (Sutter, Alexandrescu)The C++ programming language (Stroustrup, Part IV)Object-oriented programming (Peter Coad)P…