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Different types of probability sampling methods?

Handy techniques in data science to create sample population

Posted on October 1, 2019

Basically sampling method refers to the way where observations are selected from the large population to create a sample for a sample survey or experiment. While solving some problems in a data science, we might be in dilemma regarding which data to pickup from the population to train your model.... [Read More]

Where are Eigenvectors and Eigenvalues used?

Applications of eigenvectors and eigenvalues

Posted on September 1, 2019

Eigenvectors and Eigenvalues are mainly used to capture key information that is stored in a large matrix. It provides summary of a large matrix. We can represent large set of information in a matrix and performing computation on a large matrix is slow and requires more memory and CPU. Eigenvectors... [Read More]

Before you bury yourself in packages, learn the Node.js runtime itself(Answers)

Answers for the questions mentioned in medium.com's featured post regarding nodejs

Posted on March 10, 2017

I have tried to answer the questions by Samer Buna regarding NodeJS runtime mentioned on the following link. Please correct me if something is wrong. Original post with following nodejs questions What is the relationship between Node.js and V8? Can Node work without V8? How come when you declare a... [Read More]

What are several techniques to optimize webpages?

Collection of techniques to optimize loading time of a webpage.

Posted on February 20, 2017

In this post I would like to mention about the techniques which can be applied to reduce the loading time of a webpage. There are several optimization techniques that can be used to boost up the performance any webapplication. I have covered a brief introduction for each techniques rather than... [Read More]

Debugging tips using chrome's developer's tool.

Power of 'console' object?

Posted on February 15, 2017

If you have worked with JavaScript, probably you must be familiar with console object used for debugging. Most of the us are familiar with console.log(), console,error(), console.info() and console.warn() but there are other interesting stuff we can do with console object which are listed below. 1) Embed styles You can... [Read More]

Pattern for writing simple JavaScript library?

How to write a simple JS library similar to jQuery?

Posted on February 10, 2017

I have been thinking about how jQuery works under the hood and how can I write something like jQuery. It looks like there are standard patterns used by world class developers. I know there are several ways to write a library which encapsulates variables and methods used inside the library.... [Read More]

What is event delegation in JS?

Do you know about event bubbling and capturing?

Posted on February 8, 2017

Before understanding event delegation lets see what wikipedia says about Delegation “Delegation is the assignment of any responsibility or authority to another person”. In the world of JS, event delegation means assigning responsibility of one element to another element. Event delegation allows us to avoid adding event listeners on specific... [Read More]

What's new in ECMAScript6 (ES6)?

Comparision between ES5 and ES6 features.

Posted on February 6, 2017

This post contains important new features introduced in ES6. We will go through the syntax used in ES5 side by side with ES6. Classes //ES5 Style var Shape = function(id, dx, dy) { this.id = id; this.move(dx, dy); } Shape.prototype.move = function(dx, dy) { this.x = dx; this.y = dy;... [Read More]

Fun with JavaScript

Check your JS knowledge by answering the expected output?

Posted on January 15, 2017

1. What is the expected output of following code snippet? (function(){ var a = b = 3; })(); console.log("a defined? " + (typeof a !== 'undefined')); console.log("b defined? " + (typeof b !== 'undefined')); console.log(0.1 + 0.2); console.log(0.1 + 0.2 == 0.3); console.log(typeof NaN === "number"); // logs "true" console.log(NaN... [Read More]

How are variables memory referenced from execution context, incase of Closure?

Variables on one execution context are referenced by second execution context.

Posted on January 5, 2017

In this post I will explain, how variables are referenced from execution context in case of closure with an example. Let’s begin with an example below. function createFunctions() { var funcArray = []; for(var i=0; i< 4; i++) { funcArray.push(function() { console.log(i); }); } return funcArray; } var funcList =... [Read More]