Scope for Beginners
In JavaScript, lexical scope deals with where your variables are defined, and how they will be accessible — or not accessible — to the rest of your code.
More …Primitive Data Types in Java
Variables in Java need to be declared before they can be used in Java because it is a statically-typed language. Because of this, you need to state the type of variable you are declaring.
More …Objects and JSON
What are JavaScript Objects?
More …Let and Const for Block Scope
Up until ES6, you couldn’t achieve true block scoping in JavaScript. With the var keyword, the scope in a code block could be accessed in the global scope, as variable declarations are hoisted to the top of scope and the assignments are kept where they are.