January 2017
Intermediate to advanced
472 pages
14h 42m
English
Content preview from Functional Programming in JavaBecome 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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Why Functional Programming?
Functional programs contain no assignment statements, so variables, once given a value, never change. More generally, functional programs contain no side-effects at all. A function call can have no effect other than to compute its result. This eliminates a major source of bugs, and also makes the order of execution irrelevant—since no side-effect can change an expression’s value, it can be evaluated at any time. This relieves the programmer of the burden of prescribing the flow of control. Since expressions can be evaluated at any time, one can freely replace variables by their values and vice versa—that is, programs are “referentially transparent.” This freedom helps make functional programs more tractable mathematically ...
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