Exercise 1.5: Array Transformations

Level 1

Exercise 1: map: You have an array of numbers [1, 2, 3, 4]. Create a new array containing the square of each number.

Exercise 2: filter: You have an array of numbers [1, 2, 3, 4]. Create a new array that only contains the even numbers.

Exercise 3: find: You have an array of numbers [1, 10, 8, 11]. Use the find function to get the first number greater than 10.

Exercise 4: reduce: You have an array of numbers [13, 7, 8, 21]. Use the reduce function to calculate the total sum of the numbers.

Level 2

Exercise 5: Given the array "[1, 3, 7, 10, 15, 17, 11, 5, 8, 12, 9]", create a one-liner function that does the following:

  • Filters the numbers greater than or equal to 10.
  • Multiplies each filtered number by 2.
  • Calculates the sum of the filtered and multiplied numbers.
  • The function must return the result of the sum.

    • Level 3

    Exercise 6: every and some: Determine whether all or some of the elements in the array [11, 12, 13, 14] are greater than 10, respectively.

    ⚠️ Important: Open the browser console (F12 or Ctrl+Shift+I) to see the results of the exercises and verify that they work correctly.

    Back to index