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June 14, 2000 WMLScript's invalid Literal  Tips: June 2000
Yehuda Shiran, Ph.D.
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WMLScript supports several literals that are not included in JavaScript. The invalid value is one of them. When you divide a number by zero, you get the invalid value. You also get it if an operation results in a floating-point number that is not part of the set of finite real numbers supported by the single-precision floating-point format. In fact, any data type conversion failure results in a returned value of invalid. Most of WMLScript's 70 functions return invalid in case of error.
For more on WMLScript, go to WMLScript Primer.
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