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lets-get-functional

An exercise in problem solving in the functional idiom.

Step 0 - Release lodown

  • If you haven't release your lodown library to npm (node package manager), follow the steps in this video to do so:

    publishing-npm-packages

Step 1 - Setup

  • Run os install to install Lets Get Functional
  • Copy the name of your lodownpackage. It should be something like lodown-oliviasaborush
  • In your bash terminal run the command npm install --global lodown-oliviasaborush with your lodown package
  • In your bash terminal run the command npm link lodown-oliviasaborush with your lodown package
    • These commands will not work unless you use your lodown name
  • Open index.js
  • Update line 6 of index.js to reference your lodown library
  • It should look something like this:
const _ = require('lodown-oliviasaborush');

Step 2 - Solve

  • Implement the functions outlined below, using your lodown library
  • Code and test your solutions in index.js
  • Data is available to you in an Array stored in the variable customers
  • To test your solutions run npm start --prefix ./<YOUR_GITHUB_FOLDER/projects/let-s-get-functional in your terminal

IMPORTANT: Make sure you replace <YOUR_GITHUB_FOLDER with your actual github folder in your workspace.

1: maleCount

  • Objective: Find the number of male customers
  • Input: Array
  • Output: Number
  • Constraints: use filter

2: femaleCount

  • Objective: Find the number of female customers
  • Input: Array
  • Output: Number
  • Constraints: use reduce

3: oldestCustomer

  • Objective: Find the oldest customer's name
  • Input: Array
  • Output: String
  • Constraints:

4: youngestCustomer

  • Objective: Find the youngest customer's name
  • Input: Array
  • Output: String
  • Constraints:

5: averageBalance

  • Objective: Find the average balance of all customers
  • Input: Array
  • Output: Number
  • Constraints:

6: firstLetterCount

  • Objective: Find how many customer's names begin with a given letter
  • Input: Array, Letter
  • Output: Number
  • Constraints:

7: friendFirstLetterCount

  • Objective: Find how many friends of a given customer have names that start with a given letter
  • Input: Array, Customer, Letter
  • Output: Number
  • Constraints:

8: friendsCount

  • Objective: Find the customers' names that have a given customer's name in their friends list
  • Input: Array, Name
  • Output: Array
  • Constraints:

9: topThreeTags

  • Objective: Find the three most common tags among all customers' associated tags
  • Input: Array
  • Output: Array
  • Constraints:

10: genderCount

  • Objective: Create a summary of genders, the output should be:
{
    male: 3,
    female: 4,
    non-binary: 1
}
  • Input: Array
  • Output: Object
  • Constraints: Use reduce

Step 3: Submit

  • When you are passing all tests, run os submit
  • Select your current session
  • Select Let's Get Functional
  • If you pass all tests, you will get a green light!