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isNaN( expression )
Returns true if the expression's value is not a number; otherwise returns false.
Example:
var x = parseFloat( "3.142" );
var y = parseFloat( "haystack" );
if ( NaN( x ) ) debug( "x is not a number" );
if ( NaN( y ) ) debug( "y is not a number" );
// Prints: "y is not a number"