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explain the concept of function composition in computer programming.
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function composition is a programming technique in which two or more functions are combined to create a new, combined function. it is a way of writing a single expression that performs multiple operations in a given order. the idea is to compose a complex operation from simpler ones, by combining multiple functions together. by using function composition, it is possible to create a single, powerful expression which can perform a sequence of operations that are otherwise too complicated to be written in a single line of code.
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