Nowadays JavaScript has three different keywords to declare a variable — var, let and, const. Each has its own properties and particularities. Let’s start by making a simple comparison table ...

-scope chain refers to mechanism that javasScript uses to resolve variable reference SCOPE CHAIN PROCEDURES TO RESOLVE VARIABLE ACCESS IN JAVASCRIPT Start with the Current Scope: The engine first ...

The scope is the current context of execution in which values and expressions are "visible" or can be referenced. If a variable or expression is not in the current scope, it will not be available for ...