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JavaScript Types Nuance

I was once teaching a class on JavaScript to a group of C# developers when someone asked a very logical question, “Are JavaScript Types all derived from Object?”

I loved teaching this particular group because they were actively engaged in the material.  So many times, when I teach, the students simply absorb what I say, but they don’t interact with it.  They never ask the question, “What are the implications of what is being said.”

My initial instinct was to say ‘no’ based on my experience with the language.  But then as I thought about it later, I thought, “But when I use the debugger on what seems to be a primitive, don’t I see it as an object?”  And as it turns out, my instinct was right.  Not everything in JavaScript is an object.  Although there is quite a bit that you wouldn’t think was an object that is.

Now that we’ve covered JavaScript Objects and JavaScript Object Fields, it is time to move on to the specifics of JavaScript types.

So, why is it, when I look at some primitive values, I see them as objects?  And which types are objects and which are primitives?

Photo via Visualhunt

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Do This To Increase Your Client Side Web Development Speed

Over the last year, in particular, I’ve developed a technique for developing the client side of a web application using JavaScript, HTML and CSS that has significantly improved my development speed.  Once I tell you, it will be obvious.  At least, it is to me … now.  But as obvious as it is, I rarely see this technique used on any of the applications my peers are working on.

And while this technique is an outgrowth of my involvement with TDD, this particular technique can be used with or without TDD.

Do This To Increase Your Client Side Web Development Speed
Photo credit: JD Hancock via VisualHunt / CC BY

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JavaScript MVVM – You’re (Probably) Doing it Wrong

If you are using one of the many frameworks that say they are using JavaScript MVVM, you might not be using it the way it should be used.

Many of my clients aren’t.

This article will attempt to answer three questions.

  • What is MVVM?
  • What are the advantages of MVVM?
  • What are good MVVM coding practices?


JavaScript & MVVM
Photo credit: uka0310 via VisualHunt / CC BY

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Ext JS 6 by Sencha – The Good, The Bad, The Ugly

Long time readers may remember that I started using Ext JS about 3 years ago.  At the time, I was using version 4.2.2.  I recently started a new contract where they are using Ext JS 6.0.1.  I have to say, this version solves a lot of the architectural issues I had with the 4.x series.  But, there are still problems.

Since I’ve provided an evaluation of Angular 2 and React JS, I thought providing an evaluation of the current version of Ext JS would be appropriate since these three seem to be the main players in the corporate world.

Ext JS by Sencha - The Good, The Bad, The Ugly
Photo credit: sanbeiji via Visual Hunt / CC BY-SA

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