Variable part, 4

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Variables

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Naming Variables

JavaScript variable names are case-sensitive. 
In the example below we changed x to uppercase:

var x = 100;
document.write(X);Try It Yourself

This code will not result in any output, as x and X are two different variables.

Naming rules:
- The first character must be a letter, an underscore (_), or a dollar sign ($). Subsequent characters may be letters, digits, underscores, or dollar signs.
- Numbers are not allowed as the first character.
- Variable names cannot include a mathematical or logical operator in the name. For instance, 2*something or this+that;
- JavaScript names must not contain spaces.
Hyphens are not allowed in JavaScript. It is reserved for subtractions.

What characters can be used to start a variable?

Select all that apply

Underscore sign (_)

Letters

Numbers

Mathematical operators