Arkiteckt/objective-reasoning

objective-reasoning

Working with objects! We'll write some functions that show us the power and flexibility of objects. As usual start of by:

• Fork this repo
• Clone it to your computer
• run npm install to install the jest dependency
• run npm run test to run the tests

1. isAdmin

Write a function, isAdmin that takes in a user object and returns true if the user is an admin, as indicated by their userRole key. All admins' userRole attributes are equal to 'ADMIN'.

A user object will look like this:

{
    firstName: String,
    lastname: String,
    userRole: String
}

Examples

isAdmin({
    firstName: 'Eileen',
    lastName: 'Smith',
    userRole: 'REGULAR_USER'
})
=> false

isAdmin({
    firstName: 'Ian',
    lastName: 'Rogers', 
    userRole: 'USER_MANAGER'
})
=> false

isAdmin({
    firstName: 'Jeff',
    lastName: 'Wilson', 
    userRole: 'ADMIN'
})
=> true

2. getEmail

Write a function, getEmail, that given a user object, return the users' Code Immersives email. We'll assume that a Code Immersives email is always in firstName.lastName@codeimmersives.com form.

Examples

getEmail({
    firstName: 'Brian'
    lastName: 'Carela'
})
=> 'brian.carela@codeimmersives.com'

getEmail({
    firstName: 'Anthony',
    lastName: 'DeRosa'
})
=> 'anthony.derosa@codeimmersives.com'

3. getPlaylistLength

Write a function, getPlaylistLength that takes in a playlist and returns the number of songs in the playlist

A playlist object will look like this:

{
    name: 'my jams',
    songs: ['Vienna', 'Hey Ya!']
}

Examples

getPlaylistLength({
    name: 'hits',
    songs: ['The Distance', 'Ruby Tuesday', 'Old Town Road (remix)']
})
=> 3

getPlaylistLength({
    name: 'empty playlist',
    songs: []
})
=> 0

4. getHardestHomework

Write a function, getHardestHomework that takes in an array of homework objects and returns the name of the hardest homework assignment. The hardest homework will be the one that has the lowest average score. If the array contains no homeworks, return an empty string.

Examples

getHardestHomework([])
=> ''

getHardestHomework([
    { name: 'homework 1', averageScore: 99 },
    { name: 'homework 2', averageScore: 1 }
])
=> 'homework 2'

getHardestHomework([
    { name: 'hip-hip-array', averageScore: 12 },
    { name: 'wait-i-object', averageScore: 200 },
    { name: 'objective-reasoning', averageScore: 25 }
])
=> 'hip-hip-array'

5. createPhonebook

Write a function, createPhonebook, that creates a phonebook object from an array of names and phone numbers.

Examples

createPhonebook(['Jimothy', 'Maria', 'Karl'], ['123-456-7890', '000-000-0000', '999-888-7766'])
=> {
    'Jimothy': '123-456-7890',
    'Maria': '000-000-0000',
    'Karl': '999-888-7766'
}

createPhonebook(['Melissa', 'Andre'], ['206-111-2233', '321-123-2424'])
=> {
    'Melissa': '206-111-2233',
    'Andre': '321-123-2424'
}

createPhonebook([], []);
=> {}