This process aggregates the terms and assigns each one a value that will indicate what type of result it should return. MapReduce connects search terms in the form of key/value pairs using a function called reduce.
One incredibly powerful example of the functional method is Google's implementation of MapReduce and its approach to returning results to certain search terms. A "pure" function is deterministic and will not produce side effects - in other words, it will always return the same value when called and will not modify anything outside of its scope or parameters. With functions, the same inputs consistently lead to the same result. In essence, functional programs behave like common math functions, such as the calculations behind a conversion from Celsius to Fahrenheit.
In this piece, we'll review the major differences between functional and object-oriented programming, offer up a few examples of how they work, and review the considerations that matter most when making the choice between these coding paradigms. Many of these languages include elements that are almost indistinguishable from functions, but they're a far cry from the mechanisms behind a purely functional programming language such as Haskell. Object-oriented programming is a widely accepted development approach, and often underlies the structured programs most developers learn to write in the early stages of their career.
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