JavaScript Pocket Reference, 2nd Edition

Name

Boolean

Constructor

new Boolean(value)
Boolean(value)

Invoked as a function, without the new operator, Boolean( ) converts value to a boolean value (not a Boolean object) and returns it. All values convert to true except for 0, NaN, null, undefined, and the empty string, “”. When invoked with the new operator, the Boolean( ) constructor performs the same conversion and wraps the result in a Boolean object.

Methods

toString( )

Returns “true” or “false”, depending on the value of the Boolean object.

valueOf( )

Returns the primitive boolean value wrapped by the Boolean object.