6HIGHER-ORDER FUNCTIONS
Higher-order functions are central to functional programming and flow naturally from the idea that functions should be “first-class objects” in a language, with all of the rights and privileges that numbers or lists have. A higher-order function is one that accepts a function as input and/or returns a function as output. Many things we want the computer to do for us find a natural expression as a higher-order function.
In this chapter, we’ll first look at higher-order functions that produce functions as output. We’ll see that these higher-order functions can be viewed as having one input, or alternatively, as having multiple ...
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