How to add class in react conditionally

During initial day of react coding, all of us must stuck with the question how to add class in react conditionally. One often requires to add class in react DOM element based on some condition. Adding cladd using conditional operator is an very easy way to add class in react conditionally like this.

  In above code, hide class will be added when this.state.showLoading value will be set to false.  

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How to calculate the executing time of Javascript code

Are you looking out for the way using which you can get the executing time of Javascript code? Around the javaScript community i have seen people using various methods to achieve the same. Today i will discus various of them and also discuss which one is the better one and why.   Use Cases: There are a few situations where you’d use this high resolution timer instead of grabbing a basic timestamp: Benchmarking game or animation runloop code Calculating frame rate with precision Cueing actions or audio to occur at specific points in an animation or other time-based sequence Let’s …

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A fresh start of Life

My life was very smooth & happy a year back and within a year i had lost everything i had. Love, money, inspiration, self image and everything i had. I made terrible mistakes, even try hard to fix some of things & lost in black hole of my thoughts. Now i left with nothing. Yesterday i was sitting in my house holding my head full of pain. For a time being it feels like i got so much burden on my head and no string is left to pull off now. Honestly speaking, i even got life ending thoughts.   …

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How to update node on mac

I was reading some documentation and i got to know that i need to upgrade my node version. you can check your current node js version by typing this.

Here is the quick way to update node JS version.  First of all just update your Homebrew package manager.

After Homebrew got updated. Now you can update your node js version.

After it updated. Try checking your updating node version.


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Hash vs chunkhash vs ContentHash

From last some days, i was thinking of writing this blog but got too busy with other things. Tonight i get some time on writing on this topic. This particular blog post i have not published here, This is actually published on You can read full blog post by clicking here.   I also had written webpack 1 to webpack 2 migration blog post which you can read by clicking the link.   It’s too late tonight, almost morning now. I should take some nap now.    

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Migration to webpack-2

Recently i have done webpack migration for our React redux project to Webpack 2. There are lot of syntax changes was there (Which i will explain below) that needs to be made. Also webpack also provides features like Tree shaking, Caching, dynamic imports etc which leads to change in compilation time and bundle sizes. Let me give little overview of what all major syntax changes for migration and than we will discuss various feature to improve webpack bundling process. 1. Module.loaders changed to module.rules: In webpack 1, modules.loaders got changed to module.rules, loaders names array is changed to use.         …

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center text in SVG shapes

Whenever you place text inside any SVG shape (rectangle, ellipse, circle etc), you would like to center text in SVG shape. In HTML placing a text relative to parent can be easily done using “text-align: center” property, similarly you can place text center of SVG shape with help of “text-anchor: middle”.  For SVG, it is not that straight forward but i will explain below, how you can achieve it. Let’s first of all create an svg tag as follow:

Now lets add a <g> tag inside svg to group multiple tag inside.

Now let’s add a circle and text tag inside <g> tag. …

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New ES6 Features

ECMAScript 6, also known as ECMAScript 2015, is the latest version of the ECMAScript standard. Implementation of these features in major JavaScript engines is underway now. See the ES6 standard for full specification of the ECMAScript 6 language.   ES6 includes the following new features: Arrow Function Classes Destructuring Constant and let Arrow Function: Arrow functions are a new ES6 syntax for writing JavaScript Functions. They will save developers time and simplify function scope. ES6 fat arrow functions have a shorter syntax compared to function expressions and lexically bind to this value. Arrow Function Syntax:

JavaScript function can be written in two ways …

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Adding large number in JavaScript

Today i had an Interview with one of the company and interviewer guy (Ritesh) asked me very simple problem that “How will you add two numbers if numbers are very large/Add large number in JavaScript?”. Frankly saying, i never gave a thought about this problem ever. My interviewer didn’t got got impressed but still i thought of solving it. So below id the function that i have coded for it. Problem: Javascript support at most 53 bit of integer only. If number goes beyond it, Javascript loose precision.  Small number can be added simply as follow:

But if you try …

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