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Assignment

Tasks 1 and 2 are short warmups; task 3 is a larger, real-world-style task where everything is visible in one page or app.

  • Task 1 (Doubling of number): JavaScript only. Submit your solution using map and filter (and arrow functions).
  • Task 2 (Codewars): Complete the Katas on Codewars. No frontend or repo submission needed.
  • Task 3 (Working with movies): Frontend required. Build an HTML page with CSS and JavaScript that runs in the browser and shows the result of each movie sub-task in the page (e.g. sections or cards with the computed data).

1. Doubling of number

Say you would like to write a program that doubles the odd numbers in an array and throws away the even number.

Your solution could be something like this:

let numbers = [1, 2, 3, 4];
let newNumbers = [];

for (let i = 0; i < numbers.length; i++) {
  if (numbers[i] % 2 !== 0) {
    newNumbers[i] = numbers[i] * 2;
  }
}
// expected result: [2, 6]

Rewrite the above program using map and filter; don't forget to use arrow functions.

2. Codewars!

Complete these Katas:

3. Working with movies

cinema

What the user sees: One page (e.g. sections or cards) where every sub-task’s result is visible in the browser: short titles, long titles, 1980s count, tagged movies, ratings over 6, keyword count, duplicated-word titles, and optionally average rating and Good/Average/Bad counts.

Copy the movies array from movies and use it for the tasks below.

  1. Create an array of movies containing the movies with a short title (you define what short means)
  2. Create an array of movie titles with long movie titles
  3. Count the number of movies made between 1980-1989 (including both the years)
  4. Create a new array that has an extra key called tag. The tag is based on the rating: Good (>= 7), Average (>= 4 and < 7), Bad (< 4)
  5. Using chaining, first filter the movies array to only contain the movies rated higher than 6. Now map the movies array to only the rating of the movies.
  6. Count the total number of movies containing any of following keywords: Surfer, Alien or Benjamin. So if there were 3 movies that contained Surfer, 1 with Alien and 2 with Benjamin, you would return 6. Can you make sure the search is case insensitive?
  7. Create an array of movies where a word in the title is duplicated. e.g. "Star Wars: The Clone Wars" the word Wars is duplicated. Here are some made-up examples of movies with duplicated words in the title: "The three men and the pistol", "Chase three - The final chase"
  8. Calculate the average rating of all the movies using .reduce() Optional
  9. Count the total number of Good, Average and Bad movies using .reduce(). A return could be e.g. {goodMovies: 33, averageMovies: 45, goodMovies: 123} Optional