ActionScript for Flash MX: The Definitive Guide, Second Edition

isFinite() Global Function

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ActionScript Language Reference

Example

int(4.5) // Yields 4

int(-4.5) // Yields -4

int(3.999) // Yields 3

The int( ) function is useful to check if a number is a whole number, by comparing the orig-

inal number to the result of the int( ) function:

if (int(x) != x) {

trace("Please enter a whole number for your age in years");

}

See Also

Math.ceil( ), Math.floor( ), Math.round( ), Number( ), parseFloat( ), parseInt( )

isFinite() Global Function

check if a number is less than Infinity and greater than –Infinity

Flash 5

isFinite(number)

Arguments

number Any numeric value or expression that yields a numeric value.

Returns

The Boolean true if the number falls between –Number.MAX_VALUE and Number.MAX_VALUE

(inclusive); otherwise, false.Ifnumber does not belong to the number datatype, number is

converted to the number type before isFinite( ) executes.

Description

The isFinite( ) function simply checks if a number is in the legal numeric value range of

ActionScript. It is equivalent to checking whether

number is a number less than Infinity

and greater than –Infinity. Use isFinite( ) before executing code that requires a legitimate

number to operate properly.

Example

if (!isFinite(x * y)) { // Test if the number is not finite

trace("The answer is too large to display. Try again."); ...