Challenge 6: Quick Mode

January 13, 2016

 

 

Hey there dev's and dev's-to-be! We have a 'Quick' Lab Coat Challenge for you. Review the challenge, take a look at the starter code, and then give it your best shot. Get the right answer and earn your Lab Coat Badge.

 

Overview

 

Today’s challenge has to do with finding the mode of a given set of integers

 

Challenge

 

Using the smallest amount of code (least statements - no run on lines of multiple statements!), determine what the “mode” (most frequent number) of a set of integers is. For more information on mode go to: http://www.mathgoodies.com/lessons/vol8/mode.html.  For this challenge, if the solution is multimodal (having more than one mode), choose the lowest number of the results (IE:  If 2, 3, and 10 are modes for a set of integers, the solution will be 2).

 

Starter Code

 

You must use the following code and can only add to the code provided below.

 

/*  LAB COAT CHALLENGE: What is the minimum amount of lines

   needed in order to find the mode of the following list

   of integers? */

 

//  lists of integers to be used in the asserts

list<Integer> numbers1 = new list<Integer> {2,5,1,2,7,1,2,6,4,6,2,3,8,9};

list<Integer> numbers2 = new list<Integer> {2,5,1,6,7,8,1,5};

list<Integer> numbers3 = new list<Integer> {5,4,7,1,7,2,3,5,4};

list<Integer> numbers4 = new list<Integer> {5,4,7,2,1,7,1,2,5,4};

 

//  Test your code

system.assertEquals(mode(numbers1), new set<Integer> {2});

system.assertEquals(mode(numbers2), new set<Integer> {1,5});

system.assertEquals(mode(numbers3), new set<Integer> {4,5,7});

system.assertEquals(mode(numbers4), new set<Integer>());

 

//  YOUR CHANGES START BELOW

 

//   Implement the following method

set<Integer> mode(list<Integer> listOfIntegersToTest) {

   set<Integer> returnValues = new set<Integer>();

 

   // Your code here

 

   return returnValues;

 

}

 

 

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