Web Reference: What is a Function? A function relates an input to an output. It is like a machine that has an input and an output. And the output is related somehow to the input. " f (x) = ... " is the classic way of writing a function. And there are other ways, as you will see! Functions are used to structure your code in a better way, so that your code becomes easier to read and to use. Functions makes it possible to re-use the same code many times, which is a huge benefit. Oct 6, 2025 · A function is a special relation or method connecting each member of set A to a unique member of set B via a defined relation. Set A is called the domain, and set B is called the co-domain of the function. A function in mathematics from set A to set B is defined as, f = { (a,b)| ∀ a ∈ A, b ∈ B}
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