Chapter 3Functional Programming
Functional Programming is like a car powered by hydrogen fuel cellsâââadvanced, futuristic, and not yet widely used, but itâs what weâll all rely on in twenty years.
In contrast to an imperative program, which consists of a series of statements that change global state when executed, a functional program models computation as the evaluation of expressions. Those expressions are built from pure mathematical functions that are both first-class (can be manipulated like any other value) and side effectâfree. Itâs particularly useful when dealing with concurrency because the lack of side effects makes reasoning about thread safety much easier. It is also the first model weâll look at that allows ...
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