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isNaN()

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 ( isNaN( x ) ) debug( "x is not a number" );
    if ( isNaN( y ) ) debug( "y is not a number" );
    // Prints: "y is not a number"

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