JavaScript Tutorial for Beginners - Part 5 | JavaScript Syntax | Learn Web Technologies

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JavaScript Syntax
JavaScript syntax is the set of rules, how JavaScript programs are constructed:

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.

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.

JavaScript Operators
JavaScript uses arithmetic operators ( + - * / ) to compute values:

JavaScript Expressions
An expression is a combination of values, variables, and operators, which computes to a value
The computation is called an evaluation.

JavaScript Keywords
JavaScript keywords are used to identify actions to be performed.
The var keyword tells the browser to create variables:

JavaScript Identifiers
Identifiers are names.
In JavaScript, identifiers are used to name variables (and keywords, and functions, and labels).
The rules for legal names are much the same in most programming languages.
In JavaScript, the first character must be a letter, or an underscore (_), or a dollar sign ($).
Subsequent characters may be letters, digits, underscores, or dollar signs.

Numbers are not allowed as the first character.
This way JavaScript can easily distinguish identifiers from numbers.

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