The typeof operator is used to get a string that identifies the data type of an expression.
Syntax
typeof [ ( ] expression [ ) ] ;
The expression argument is any expression for which type information is sought.
Return a String
Returns a string that identifies the data type of an expression.
Example
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.
See also: Operator Behavior, Operator Precedence, Operator Summary |
