JavaScript Variable Naming conventions

Well-known variable naming conventions
Camel Labeling Method
The first letter is lowercase, and the next letter begins with an uppercase character. For example:

var testvalue = 0, secondvalue = "HI"; Pascal Labeling Method

The first letter is capitalized, and the next letter begins with an uppercase character. For example:

var testvalue = 0, secondvalue = "HI"; Hungarian type marking method

Appends a lowercase letter (or a lowercase sequence) to a variable named after the Pascal notation, indicating the type of the variable. For example, I represents an integer, S represents a string, as follows

var itestvalue = 0, Ssecondvalue = "HI";

JavaScript Variable Naming conventions