Keywords & Reserved Words JavaScript Const A JavaScript variable is a storage for the data, where programs can store value or information. We must give a name to the variable. We can then refer to the variable in another part of the program. In this article, we learn how to declare a variable. Also, […]
Syntax & Rules Keywords & Reserved Words JavaScript identifiers are the name that we give to variables, objects, functions, arrays, classes, etc. We must use a unique name so as to identify them. We then use the identifier to refer to the variable, functions, etc elsewhere in the program. There are certain rules &
Hoisting is a JavaScript behavior, where JavaScript creates the variable and functions prior to the execution of the script. This allows us to use the function or variable even before we declare them. In this tutorial, let us learn what is hoisting and how it works in JavaScript.
JavaScript uses the Lexical Scope to resolve the variable names when we create functions inside another function. The lexical means that JavaScript determines the parent scope of a function by looking at where we created the function and not where we invoked it. But JavaScript allows passing a function around, which means we may invoke them in a different scope than the original scope. Hence losing the connection to its parent scope. JavaScript solves this problem by creating Closures. A Closure contains function along with reference to its parent scope allowing the function to stay connected with its parent scope.
this tutorial, we will learn what are objects in JavaScript and how to create objects and use them
