Flash Player 4.
String(expression)
expression An expression to convert to a string.
A string.
Function; returns a string representation of the specified parameter as follows:
If expression is a Boolean value, the return string is true or false.
If expression is a number, the return string is a text representation of the number.
If expression is a string, the return string is expression.
If expression is an object, the return value is a string representation of the object generated by calling the string property for the object, or by calling Object.toString if no such property exists.
If expression is a movie clip, the return value is the target path of the movie clip in slash (/) notation.
If expression is undefined, the return value is an empty string ("").
Number.toString(), Object.toString(), String object, " " (string delimiter)