JavaScript Syntax

JavaScript Values

The JavaScript syntax defines two types of values: Fixed values and variable values.

Fixed values are called literals. Variable values are called variables.

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JavaScript Literals

The most important rules for writing fixed values are:

Numbers are written with or without decimals:

Strings are text, written within double or single quotes:

JavaScript Variables

In a programming language, variables are used to store data values.

JavaScript uses the var keyword to declare variables.

An equal sign is used to assign values to variables.

In this example, x is defined as a variable. Then, x is assigned (given) the value 6: