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JavaScript Scope

In this blog post we will dig deeper into various aspects of JavaScript scope.  This is a pretty interesting topic  and also a topic which confuses many beginning JavaScript programmers. Understanding JavaScript scope helps you write bug free programs (hmm.. atleast helps your troubleshoot things easily) Scope control the visibility and lifetimes of variables and parameters.  This is important from the perspective of avoiding naming collisions and provides memory management service. Unlike other languages, JavaScript does not have block level scope.  For e.g. take for instance the following piece of c# code. public void Main () { int a = 5; if (true) { int b = 10; } // This will throw compile time error as b is not defined // and not within the scope of function Main(); Console.WriteLine(b); } If you write the same code in JavaScript, then the value of 'b' will be available outside the 'if' block. The reason for this is JavaScript does no
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Personal Development : Time, Planning , Repairs & Maintenance

These are just my thoughts, but some you may find something interesting in it. Please think over it. We may know many things, but still we always keeps procrastinating it. I have written this as I have heard many people coming back and saying they don’t have time to do things they like. These are my thoughts buy may be useful to someone else too. Certain things in life needs periodic repairs and maintenance. To cite some examples , your CAR, your HOUSE, your personal laptop/desktop, your health etc. Likewise there are certain other things in professional life that requires repair/ maintenance /or some kind of polishing, so that you always stay on top of it. But they are not always obvious. Some of them are - Improving your communication skills - Increasing your vocabulary - Upgrading your technical skills - Pursuing your hobby - Increasing your knowledge/awareness etc… etc… And then there are certain things that we are always short
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JavaScript Function Spaghetti Code

In this post we will have a look at the spaghetti code created by functions and how to avoid them. First lets quickly go through why this is a cause of concern. Problems with Function Spaghetti Code Variables/ functions are added to the global scope The code is not modular There's potential for duplicate function names Difficult to maintain No namespace sense. Let's take for example the following set of functions and check whats the issue with them. // file1.js function saveState(obj) {     // write code here to saveState of some object     alert('file1 saveState'); } // file2.js (remote team or some third party scripts) function saveState(obj, obj2) {      // further code...     alert('file2 saveState"); } Now the problem here is if your application is using saveState() then the execution of saveState() which one to call is determined by the script loading.  The later script overrides same functions already defined by earlier script. F
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