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MV Your Way: Extending mvBASIC


Summary

Most flavors of mvBASIC have a little used, often misunderstood structure called FUNCTION . It isn't exactly like FUNCTION in other languages. In PHP, JavaScript, nearly every language that has it, you can stack dozens of FUNCTION s into a single script or source record. The one in mvBASIC requires its own document. One function per source record. On a quick glance, this makes it look like a poor cousin of SUBROUTINE . You couldn't be blamed for thinking it has no real purpose.

That's what I thought for most of my career. Now, I'm beginning to develop a deep respect for it instead. In this article, and the next, I hope to sell you on the value of the humble FUNCTION .

The line of code in Figure 1 will not compile in mvBASIC.

019 doz = xconv(quantity,'unitsToDozens')
Figure 1

It sure would be nice to have a built-in library of any-to-any math conversions. If XCONV existed, it could convert radius to circumference. It could change liters to ounces. There are plenty of standard conversions that I don't need to recode over and over again.

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