Oracle Visual Builder: Applications That Outlive Their First Release · Module 9 · Fragments, components and reuse
When to make one
Lesson 93 of 176 · 3 min
THE THIRD TIME, NOT THE FIRST. Premature reuse produces A SHAPE THAT FITS NOTHING PROPERLY. The instinct on seeing something twice is to extract it. Waiting for the third is the difference between a fragment that helps and one everybody works around. THE REASON IS THAT TWO EXAMPLES CANNOT TELL YOU WHAT VARIES. Two customer panels look identical, so you extract exactly what they have in common — and the third turns out to need one extra field, a different action, and no header. Now the fragment has three parameters bolted on to accommodate a case it was not designed around, and each is a condition inside it. THREE EXAMPLES SHOW YOU THE AXIS OF VARIATION, WHICH IS THE THING WORTH DESIGNING AROUND. With three you can see what genuinely differs from case to case, and the fragment's parameters describe that rather than patching it. AND DUPLICATION IS CHEAPER THAN…
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