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Modifying the Summation Functions#

Sumit Rawal answered on May 23, 2023 Popularity 1/10 Helpfulness 1/10

answer Modifying the Summation Functions#

Modifying the Summation Functions#

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Below shows how the summation functions would now be redefined. Notice how the parameters of the functions aren’t being specified anymore. This being said, when we call the functions, we still pass the upper and lower bounds as parameters.

def sum(f: Int => Int): (Int,Int) => Int ={
  def sumHelper(a: Int, b: Int): Int =
    if(a>b) 0
    else f(a) + sumHelper(a+1, b)
  sumHelper
}

def factorial(x: Int): Int ={
  if(x==0) 1
  else x * factorial(x-1) 
}

def sumOfInts = sum(x => x)
println(sumOfInts(1,5))

def sumOfCubes = sum(x => x*x*x)
println(sumOfCubes(1,5))

def sumOfFactorials = sum(factorial)
println(sumOfFactorials(1,5))

Popularity 1/10 Helpfulness 1/10 Language scala

Source: Grepper

Tags: scala

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Contributed on May 23 2023

Sumit Rawal

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