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 ...

In JavaScript, the global scope is the outermost scope, outside of any functions or blocks. Any variables or functions declared in the global scope are accessible from anywhere in the code, including ...

JavaScript variable names should not start with a numeral (0-9). They must begin with a letter or the underscore character. For example, 123name is an invalid variable name but _123name or name123 is ...