Dynamic HTML: The Definitive Reference

Name

typeof — NN 3 IE J1 ECMA 1

Synopsis

The typeof operator. This unary operator returns one of six string descriptions of the data type of a value. Those returned types are:

• boolean

• function

• number

• object

• string

• undefined

The object type includes arrays, but the operator provides no further information about the type of object or array of the value.

Example

if (typeof someVar == "string") {
    ...
}