typeof Operator

Returns a string that identifies the data type of an expression.

typeof[(]expression[)] ;

The expression argument is any expression for which type information is sought.


The typeof operator returns type information as a string. There are six possible values that typeof returns: "number," "string," "boolean," "object," "function," and "undefined."

The parentheses are optional in the typeof syntax.


Version 1

See Also

Operator Precedence | Operator Summary