A-C > Boolean (function) |  |

Boolean (function)

boolean function

Availability

Flash Player 5.

Usage

    Boolean(expression)

Parameters

`expression` An expression to convert to a Boolean value.

Returns

A Boolean value or the value `expression`, as described below.

Description

Function; converts the parameter `expression` to a Boolean value and returns a value as follows:

| If `expression` is a Boolean value, the return value is `expression`.
| If `expression` is a number, the return value is `true` if the number is not zero, otherwise the return value is `false`.
| If `expression` is a string, the `toNumber` method is called and the return value is `true` if the number is not zero, otherwise the return value is `false`.
| If `expression` is undefined, the return value is `false`.
| If `expression` is a movie clip or an object, the return value is `true`.