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Chapter 19. Building User-Defined Functions > Functions Turn Input into Output

Functions Turn Input into Output

Think about a few of the CFML functions you already know. Almost all of them accept at least one piece of information, do something with the information internally, and then return some kind of result. For instance, ColdFusion's UCase() function accepts one piece of information (a string), performs an action (converts it to uppercase), then returns a result (Figure 19.1).

Figure 19.1. UCase() function process



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