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Instrumentation

How many applications in production are having instrumentation code in it?
Yeah.... you can count it. That's the state of current applications handling millions of request, running trillions of transactions...

It's something akin to an airplane not having a blackbox. You won't ever know what went wrong with it in case of any disaster.

More to come....

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JavaScript - The this keyword

"this" is one of the most misunderstood construct in JavaScript.  To understand this first lets go through how to create a construction function in JavaScript.  A constructor function is a function which is used to create instances of objects in JavaScript.

You define a constructor function using the same notation that you use to define a normal JavaScript function.  The convention to follow is to capitalize the first letter of the function name.

This requirement is not enforced by the JavaScript language but it is a generally accepted practice and there are many benefits which we will shortly discuss.

Let's define a constructor function to hold our menu information.

function Menu() { }
So, in the above snippet you have a constructor function named Menu defined. At present this function doesn't do anything good.

Let's see how to invoke this function

var menu = new Menu();
Let's add some public properties to this function.
function Menu() { this.menuName = &q…