January 2017
Intermediate to advanced
314 pages
6h 42m
English
Content preview from .NET Design PatternsBecome 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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Referential transparency
Let's delve a bit deeper to understand the consequences of being functional, as illustrated by the definitions given in the preceding section. Now, when we try to relate functions from both these worlds (mathematical and imperative programming), we see a strong disparity, as the latter mutates state with commands in the source language, thereby bringing in side effects (though desirable from an imperative programming standpoint). This violates one of the fundamental pre-requisites of functional programming - that of referential transparency, that is, the same expressions (when run at different times) yield different values with respect to the executing program's state. This affects the predictability of the program, which ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.