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 ;

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var variableName = value ;

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const variableName = value ;

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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.

Variables declared with let and const can only be…