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In mathematics a function is a relation between sets that associates to every element of a first set exactly one element of the second set typical examples are functions from integers to integers or from the real numbers to real numbers functions were originally the idealization of how a varying quantity depends on another quantity for example the position of a planet is a function of timevertical line test on a graph the idea of single valued means that no vertical line ever crosses more than one value if it crosses more than once it is still a valid curve but is not a function some types of functions have stricter rules to find out more you can read injective surjective and bijective infinitely many my examples have just a few values but functions usually work on the third concept is detailed in the article on higher order functions commonly the space is a space of functions in this case the functional is a function of a function and some older authors actually define the term functional to mean function of a functiondevelop more efficiently with functions an event driven serverless compute platform that can also solve complex orchestration problems build and debug locally without additional setup deploy and operate at scale in the cloud and integrate services using triggers and bindingsfunctions make the whole sketch smaller and more compact because sections of code are reused many times they make it easier to reuse code in other programs by making it more modular and as a nice side effect using functions also often makes the code more readable there are two required functions in an arduino sketch setup and loop

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