How to use JavaScript operators, expressions, and keywords

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JavaScript uses the arithmetic operator (+-* /) to calculate the value:

(7 + 8) * 10

JavaScript uses the assignment operator (=) to assign a value to a variable:

Var x, y

Var x = 7

Var y = 8

JavaScript expression

An expression is a combination of values, variables, and operators, and the result is a value.

6 * 10

Expressions can also contain variable values:

X * 10

Values can be of many types, such as numeric values and strings.

For example, "Bill" + "+" Gates ", calculated as" Bill Gates ":

"Bill" + "+" Gates "

JavaScript keyword

The JavaScript keyword is used to identify the action being performed.

The var keyword tells the browser to create a new variable:

Var x = 7 + 8

Var y = x * 10

JavaScript comment

Not all JavaScript statements are executed.

The code between the double slash / / or / * and * / is considered a comment.

Comments are ignored and not executed:

Var x = 7; / / will execute

/ / var x = 8; will not execute

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