User Guide

Boolean() 127

If files are published for Flash Player 6 or earlier, the results will differ for three of the preceding

examples:

trace(Boolean("true")); // output: false

trace(Boolean("false")); // output: false

trace(Boolean("Craiggers")); // output: false

This example shows a string that will evaluate as true if the file is published for Flash Player 7,

but will evaluate as

false for Flash Player 6 or earlier:

trace(Boolean("0"));

This example shows a significant difference between use of the Boolean() function and the

Boolean class. The

Boolean() function creates a Boolean value, and the Boolean class creates a

Boolean object. Boolean values are compared by value, and Boolean objects are compared by

reference.

// Variables representing Boolean values are compared by value

var a:Boolean = Boolean("a"); // a is true

var b:Boolean = Boolean(1); // b is true

trace(a==b); // true

// Variables representing Boolean objects are compared by reference

var a:Boolean = new Boolean("a"); // a is true

var b:Boolean = new Boolean(1); // b is true

trace(a==b); // false