In this blog we are going to learn basic fundamentals of programming. We are exploring variables and datatypes in javascript. First we try to understand variables. So what are variables. Variables : Variables are containers that stores and manage some data. There are three ways to declare a variable in javaScript. let , var and const . syntax to declare a variable : let variableName = value ; Enter fullscreen mode Exit fullscreen mode var variableName = value ; Enter fullscreen mode Exit fullscreen mode const variableName = value ; Enter fullscreen mode Exit fullscreen mode You can use let , var and const according to your use case. What is scope : Scope defines where a variable can be access in program. Global Scope : A variable declared outside any function can be access anywhere in the program. Function Scope : A variable declared inside a function cannot be accessed outside that function. Block Scope : Block scope was introduced in ES6.…