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jangaroo-runtime.2.0.19.source-code.Boolean.as Maven / Gradle / Ivy

package {


/**
 * A Boolean object is a data type that can have one of two values, either true or false, used for logical operations. Use the Boolean class to retrieve the primitive data type or string representation of a Boolean object.
 * 
To create a Boolean object, you can use the constructor or the global function, or assign a literal value. It doesn't matter which technique you use; in ActionScript 3.0, all three techniques are equivalent. (This is different from JavaScript, where a Boolean object is distinct from the Boolean primitive type.)
 * 
The following lines of code are equivalent:
 *  * var flag:Boolean = true;
 * var flag:Boolean = new Boolean(true);
 * var flag:Boolean = Boolean(true);
 * 
 * 
View the examples
 * @see http://help.adobe.com/en_US/as3/learn/WS5b3ccc516d4fbf351e63e3d118a9b90204-7f9c.html Data types
 * @see http://help.adobe.com/en_US/as3/learn/WS5b3ccc516d4fbf351e63e3d118a9b90204-7f88.html Data type descriptions
 * @see http://help.adobe.com/en_US/as3/learn/WS5b3ccc516d4fbf351e63e3d118a9b90204-7f87.html Type conversions
 *
 */
[Native]
public final class Boolean {
  /**
   * Creates a Boolean object with the specified value. If you omit the expression parameter, the Boolean object is initialized with a value of false. If you specify a value for the expression parameter, the method evaluates it and returns the result as a Boolean value according to the rules in the global Boolean() function.
   * 
When called as a function (not as constructor), it converts the expression parameter to a Boolean value and returns the value.
   * 
Unlike previous versions of ActionScript, the Boolean() function returns the same results as does the Boolean class constructor.
   * 
The result depends on the data type and value of the argument, as described in the following table:
   * 
   * 
   * 
   * 
   * 
   * 
   * 
   * 
   * 
   * 
   * 
   * 
   * 
   * 
   * 
   * 
   * 
   * 
   * 
   * 
   * 
   * 
   * 
   * 
   * 
   * 
   * 
   * 
   * 
   * 
   * 
   * 
   * 
   * 
   * 
   * 
   * 
   * 
Input Value
Example
Return Value
0
Boolean(0)
false
NaN
Boolean(NaN)
false
Number (not 0 or NaN)
Boolean(4)
true
Empty string
Boolean("")
false
Non-empty string
Boolean("6")
true
null
Boolean(null)
false
undefined
Boolean(undefined)
false
Instance of Object class
Boolean(new Object())
true
No argument
Boolean()
false
   *
   * @param expression Any expression.
   *
   * @return A new Boolean or the result of the conversion to Boolean.
   *
   * @see http://help.adobe.com/en_US/as3/learn/WS5b3ccc516d4fbf351e63e3d118a9b90204-7f9c.html Data types
   * @see http://help.adobe.com/en_US/as3/learn/WS5b3ccc516d4fbf351e63e3d118a9b90204-7f88.html Data type descriptions
   * @see http://help.adobe.com/en_US/as3/learn/WS5b3ccc516d4fbf351e63e3d118a9b90204-7f87.html Type conversions
   *
   * @example The following code creates a new Boolean object, initialized to a value of false called myBoolean:
   *    *  var myBoolean:Boolean = new Boolean();
   * 
   */
  public native function Boolean(expression:Object = false);

  /**
   * Returns the string representation ("true" or "false") of the Boolean object. The output is not localized, and is "true" or "false" regardless of the system language.
   * @return The string "true" or "false".
   *
   * @example This example creates a variable of type Boolean and then uses the toString() method to convert the value to a string for use in an array of strings:
   *    *      var myStringArray:Array = new Array("yes", "could be");
   *      var myBool:Boolean = 0;
   *      myBool.toString();
   *      myStringArray.push(myBool);
   *      trace(myStringArray); // yes,could be,false
   *     
   */
  public native function toString():String;

  /**
   * Returns true if the value of the specified Boolean object is true; false otherwise.
   * @return A Boolean value.
   *
   * @example The following example shows how this method works, and also shows that the value of a new Boolean object is false:
   *    *      var myBool:Boolean = new Boolean();
   *      trace(myBool.valueOf());   // false
   *      myBool = (6==3+3);
   *      trace(myBool.valueOf());   // true
   *     
   */
  public native function valueOf():Boolean;
}
}