Arrays #

This page contains information and coding exercises for arrays.

💻 Open up the pseudocode compiler in a new tab. You will be using this website to complete the exercises below.

Examples of how to use Arrays #

Creating Arrays #

// new array without data
MYSTUFF = []

// new array with data
COLORS = ["aqua","crimson","mauve","rust","taupe","jade","navy", "lemon"]

Adding to Arrays #

// make empty array
EVEN_NUMS = []

// loop to create each index
loop I from 0 to 9
   // add to array
   EVEN_NUMS[I] = I*2
end loop

Accessing Elements of an Array #

// Example of accessing elements of an array
MONTHS = ["January","February","March","April","May","June","July", "August", "September","October","November","December"]
output MONTHS[0]
output MONTHS[4]
output MONTHS[12]

Output:

January
May
undefined

Looping through an Array #

// Using an auto loop with an array
MONTHS = ["January","February","March","April","May","June","July", "August", "September","October","November","December"]

loop INDEX from 0 to MONTHS.length-1
    output MONTHS[INDEX]
end loop

Practice Exercises #

Exercise 1: Searching #

💻 Search through an Array to find the user input.

Create an array with 10 numbers
Get user input
Check whether the user input is in the array

Here are two example interactions for this array:

NUMS = [20, -1, 9, 4, 9, 30]

Input a number
>>> 3
Not in the array

Input a number
>>> 9
In the array

Exercise 2: Sorted/Unsorted #

💻 Check whether an array is sorted.

Create an array with 10 numbers
Output whether user array is sorted or not

Here are two arrays you can use to test your code:

UNSORTED = [32,43,55,31,29,45,46,55,60,99]
SORTED = [19,21,25,27,30,35,37,41,42,50]

Exercise 3: Movie Ratings #

💻 Categorize the movies into arrays based on their ratings.

Create 3 empty arrays: BAD, GOOD, and MID
Get the user to input the title of a movie and 1-5 star rating for the movie
Get the user to input a 1-5 star rating for the movie
Add the movie title to one of the arrays, based on its rating
After the user has added 5 movies, print out the arrays

Here is an example interaction:

What is the title of the movie?
>>> Aladdin
What is your rating? (1-5)
>>>3
What is the title of the movie?
>>> Winnie the Pooh
What is your rating? (1-5)
>>>3
What is the title of the movie?
>>> Oppenheimer
What is your rating? (1-5)
>>>5
What is the title of the movie?
>>> Barbie
What is your rating? (1-5)
>>>5
What is the title of the movie?
>>> Morbius
What is your rating? (1-5)
>>>1

>
---BAD movies---
Morbius
---MID movies---
Aladdin,Winnie the Pooh
---GOOD movies---
Oppenheimer,Barbie
>