1. Undefined vs Null

1. Introduce in React.js

Hello programmers,

Today I explain the javascript fundamental concepts. Javascript is a single-threaded scripting programming language. It was released in 1995. Nowadays ES6 version continues in javascript. Let’s start to explain javascript ES6.

1. Constant Variable

1. charAt()

The first method is:

function findLetter () {

return ‘javascript’.charAt(1)


var result = findLetter()

console.log(result) // ans is : a

The second method is :

function findLetter ()…

Programmer Naim

Front end developer

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