Boolean

A Boolean value is one that is either true or false. ActionScript also converts the values true and false to 1 and 0 when appropriate. Boolean values are most often used with logical operators in ActionScript statements that make comparisons to control the flow of a script. For example, in the following script, the SWF file plays if the variable password is true:

onClipEvent(enterFrame) {
  if (userName == true && password == true){
    play();
  }
}

See Using built-in functions and Logical operators.