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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. If number 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.");
}
isFinite(-2342434);              // Yields true
isFinite(Math.PI);               // Yields true
isFinite(Infinity)               // Yields false
isFinite(-Infinity)              // Yields false
isFinite(NaN)                    // Yields false

See Also

-Infinity, Infinity, isNaN( ), Number.MAX_VALUE, Number.MIN_VALUE; Section 4.3.3

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