JavaScript JavaScript is fun and powerful programming language for front end web developing. JavaScript is used most of the popular web applications. Eg : google Map , Gmail , PayPal , LinkedIn …… etc. JavaScript Variable Type JavaScript is loosely type language. In variable declaration we don’t need to define any datatype like integer, string , Boolean. We can declare all type of variable not only integer, Boolean , string but also objects just using ‘var’ or ‘let’ or ‘const’ keywords. Later we’ll discuss about different between these above mentioned keyword. But commonly we use var keyword to declare variable. Variable declaration When declare a variable without initializing a value then it will automatically take undefined or null value. And also we can define multiple variable with same var keyword. Variable naming concerns. JavaScript is case – sensitive. eg : Age , age are two different variable. We can’...