July 2016
Intermediate to advanced
360 pages
11h 26m
English
Content preview from Functional Reactive ProgrammingBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Appendix B. The six plagues of event handling
We’ve identified six sources of bugs in the observer pattern. FRP banishes all of them. Here we’ll describe each problem in detail, with a short explanation of how FRP fixes it.
B.1. Plague 1: unpredictable order
Let’s say you’re developing a program for drawing diagrams, in which graphical elements can be selected or deselected. The rules are these:
- If you click an item, it’s selected.
- If an item is selected and you click elsewhere, it gets deselected.
- When nothing is selected, you see a crosshair cursor.
- When any element is selected, the cursor is an arrow.
Figure B.1 shows three steps performed with the diagram program:
1. At first nothing is selected, and you’re ready to click the ...
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