Fundamentals

A variable is like a container for a value, like a number we might use in a sum, or a string that we might use as part of a sentence.

  // 🔴 Never (almost never) define a variable "var"!
  // use "const" and if you will redeclare it later use "let"!
const firstName = 'Dom';
const $nameLength = 3;
const _myFirstJob = "Coder";
const SOME_AWESOME_CONSTANT = 42;

Variable name conventions

Camel Case —> someAwesomeVar

Deep Dive

Variable naming all the way down

Show Details

By convention for JavaScript you should use:

Camel case for variables and methods. Pascal case for types and classes in JavaScript. Upper case snake case for constants.

Quick Comparison Table

Case Type	Example
Camel Case	someAwesomeVar
Snake Case	some_awesome_var
Kebab Case	some-awesome-var
Pascal Case	SomeAwesomeVar
Upper Case Snake Case	SOME_AWESOME_VAR

If you interesting to learn more read article: Most Common Programming Case Types