An interview is a part and parcel of the developer. This is the field of proving yourself that you are the right person for the recruiters. They check the inner view of the Candidates in an interview. To help you in this battle-ground, here I have discussed some tricky concept…

Before talking about React fundamentals we should know about react. What is React? React is an open-source front-end JavaScript library that is used for building user interfaces especially for single-page applications. It was created by Jordan Walke, a software engineer working for Facebook. It is used for handling the view…


There are two types of scope- Local Scope and Global Scope.

If variables are declared inside a function or block, then we will say that their scope is local and can only be accessible inside this function/block. And those variables are called Local variable.

Others all the variables/functions (outside of…


The map function is used to loop through the array, runs the operation on its elements and returns a new array. This is just what it does.

var arr= [1,2,3,4]
var> element*2)

Here, we have an array named “arr” having 4 elements. We run the map function on…


I am Sakib Uddin from Bangladesh. I am a front End Developer

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