Summation with Higher-Order Functions

In this lesson, we will go over a practical example of higher-order functions and see a higher-order function in action.


To solve the problem discussed in the previous lesson, let’s first define a higher-order recursive function sum which takes three parameters; a function f and two integers a and b (representing the lower and upper bounds respectively). The basic functionality of sum is to take the sum of all the integers between a and b. The function to be passed as an argument will perform some operation on the integers between a and b, ex. returning their cube. The result of the parameter function will then be summed to get the result of the higher-order function.

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