Write a function convertObjectToArray

It should take an object as an argument.

It should return a nested array of key value pairs.

See the example below.

Given Object

example = {
    "1": 10, 
    "2": 20, 
    "3": 30
}

Expected Output:

> console.log(convertObjectToArray(example));
[ [ '1', 10 ], [ '2', 20 ], [ '3', 30 ] ]

Create a function convertArrayData.

It should take an array as an argument.

Use array methods to manipulate the data the array below.

The first two items in the array should switch positions.

The third item should be replaced by an item containing "milk".

Return the changed array.

Original Array

let beverages = ["coffee", "tea", "juice"];

Call your function to test it, and print the result to the console.

Expected output

> console.log(convertArrayData(beverages));
[ 'tea', 'coffee', 'milk' ]

Create a function convertArraysToObject.

It should take two arrays as arguments.

first array cities should contain city names.

second array areas should contain strings with the cities areas in square kilometres

convert given arrays into object, with key value pairs using the Array method reduce

return the object as the result of your function.

Original Arrays

let cities = ["Berlin", "Hamburg", "Munich", "Stuttgart", "Duesseldorf"];

let areas = ["891.68 km2", "755.3 km2", "310.7 km2", "207.35 km2", "217.41 km2"];

Call your function and log the result to the console.

Expected output

> console.log(convertArraysToObject(cities, areas));
{
Berlin: '891.68 km2',
Hamburg: '755.3 km2',
Munich: '310.7 km2',
Stuttgart: '207.35 km2',
Duesseldorf: '217.41 km2'
}

Create a function createGrid

It should return a nested array representing a 2D grid, filled with a char.

It should accept two arguments:

• size (which determines the number of nested arrays and the number of elements in each nested array) and
• char (which determines the characters in each nested array).

Call your function and print the return value to the console.

Example and expected output:

console.log(createGrid(3, "*"));
[ [ '*', '*', '*' ], [ '*', '*', '*' ], [ '*', '*', '*' ] ]

Create a function wordConverter.

It should take an array of words as an argument and a string as a word suffix.

Use an array method, to add the suffix to the end of all words.

Important: Do not use a loop to complete this task.

Look at the expected output below.

Example

let adjectives = ["smart", "kind", "sweet", "small", "clear"];

Call your function and print the returned value to the console.

Expected output

> console.log(wordConverter(adjectives, "er"));
[ 'smarter', 'kinder', 'sweeter', 'smaller', 'clearer' ]

Create a function calculateHours

It should expect an array of objects as an argument (see example below)

it should calculate how many hours (total) this person worked in the week based on items in the given array

Note: Assume, that start is always morning time, end is always afternoon. (No overnight shifts to be expected)

Example array of Working Hours

const hourTracking = [
    { day: 'Monday', start: 8, end: 17},
    { day: 'Tuesday', start: 9, end: 15},
    { day: 'Wednesday', start: 10, end: 18},
    { day: 'Thursday', start: 7, end: 14},
    { day: 'Friday', start: 6, end: 12},
];

Call your function and print the return value to the console.

Expected Output

> console.log(calculateHours(hourTracking));
36

Create a blueprint for a course at DCI - using the class syntax in javascript.

Write a class named Course

Add a constructor to initialize the properties in the given order.

Class' properties:

• the teacher as a string,
• the type of course, whether the group is learning "marketing" or "web development"
• the number of students taking the course.

Class' methods:

• spaceNeeded that calculates how big a classroom should be depending on the number of students taking the course: 1 student = 2m².
  • E.g. If a course has 10 students, then return: "The classroom should be 20m²."
• details to return all the information of the course: "This is a web development course taught by John Smith. There are 10 students taking the course."
  • fill in the teacher, type and number from your class' properties.
• Note: Please use the exact phrases found in the instructions above and just change the output depending on the teacher, course, number of students etc.

Create an instance of your class, and call your methods. Printing their result values to the console.

Example (for an instance with teacher John, type web development and a number of 22 students)

> console.log(course.spaceNeeded());
The classroom should be 44m².

> console.log(course.details());
This is a web development course taught by John. There are 22 students taking the course.

Write function capitalizeFirstLetter

It should accepts a string as an argument.

If the argument is no string (e.g. 123 or true) convert it to a string first.

The function should convert the first character of each word to uppercase.

Example the quick brown fox → The Quick Brown Fox.

return the changed string.

Call your function and print the return value to the console.

Example call

> console.log(capitalizeFirstLetter("hey there")); 
Hey There

> console.log(capitalizeFirstLetter(true));
True

A PIN is a Personal Identification Number (as you are used with bank cards and unlocking your mobile phone)

Create the function validPin

• Note: by convention new words in function names (also acronyms) begin with uppercase letters, but continue with lowercase. Write the function as given.

Look at the unit tests (see file testing/test.js search the comment /* PIN check */ ) for validating a pin.

The function should fulfill the requirements of the unit tests.

Requirements:

• The pin code must consist of only numerical digits.
• The pin code must be 4 digits long.
• The pin should have at least two different digits.
• The pin code's last digit should be even (0, 2, 4, 6, 8).
• The sum of the pin codes digits should add up to at least 5.

The function should print true if the pin meets all the requirements and false if it does not.

Call your function with some examples, and print the return values to the console.

Examples

> console.log(validPin("1234"));
true
> console.log(validPin("1235"));// last number should be even
false 
> console.log(validPin("wwww"));// should only consist of numbers
false 
> console.log(validPin("12345"));// should be 4 digits, not 5
false 
> console.log(validPin("2222"));// not at least 2 different digits
false 
> console.log(validPin("1000"));// sum of digits is less 5
false 
> console.log(validPin("2224"));
true 

Jest is a node package to provide simple unit tests.

The test.js file and package.json file have been provided for you.

Firstly, run the following command in the appropriate folder to install and save jest as a dependency.

npm install --save-dev jest

Run the following command in order to run the test. The script has already been added to the package.json file.

npm run test

For more information, you can refer to Jest's documentation. If interested read this in detail after taking the test.