De-I > isNaN
isNaNSyntax
isNaN(
expression
);
Arguments
expression
The Boolean, variable, or other expression to be evaluated.
Description
Top-level function; evaluates the argument and returns true
if the value is not a number (NaN
), indicating the presence of mathematical errors.
Player
Flash 5 or later.
Example
The following illustrates the return value for isNan
:
isNan("Tree")
returns true
isNan(56)
returns false
isNaN(Number.POSITIVE_INFINITY)
returns false