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Assignment 1: Javascript
COMP 315: Cloud Computing for E-Commerce
March 5, 2024
1 Introduction
A common task in cloud computing is data cleaning, which is the process of taking an initial data set that may
contain erroneous or incomplete data, and removing or fixing those elements before formatting the data in a
suitable manner. In this assignment, you will be tested on your knowledge of JavaScript by implementing a set
of functions that perform data cleaning operations on a dataset.
2 Objectives
By the end of this assignment, you will:
• Gain proficiency in using JavaScript for data manipulation.
• Be able to implement various data cleaning procedures, and understand the significance of them.
• Have developed problem-solving skills through practical application.
3 Problem description
For this task, you have been provided with a raw dataset of user information. You must carry out the following
series of operations:
• Set up a Javascript class in the manner described in Section 4.
• Convert the data into the appropriate format, as highlighted in Section 5
• Fix erroneous values where possible e.g. age being a typed value instead of a number, age being a real
number instead of an integer, etc; as specified in Section 6.
• Produce functions that carry out the queries specified in Section 7.
Data name Note
Title This value may be either: Mr, Mrs, Miss, Ms, Dr, or left blank.
First name Each individual must have one. The first character is capitalised and the rest are lower
case, with the exception of the first character after a hyphen.
Middle name This may be left blank.
Surname Each individual must have one.
Date of birth This must be in the format of DD/MM/YYYY.
Age All data were collected on 26/02/2024, and the age values should reflect this.
Email The format should be [first name].[surname]@example.com. If two individuals have the
same address then an ID is added to differentiate them eg john.smith1, john.smith2, etc
Table 1: The attributes that should be stored for each user
1
4 Initial setup
Create a Javascript file called Data P rocessing.js. Create a class within that file called Data P rocessing.
Write a function within that class called load CSV that takes in the filename of a csv file as an input, eg
load CSV (”User Details”). The resulting data should be saved locally within the class as a global variable
called raw user data. Write a function called format data, which will have no variables are a parameter. The
functionality of this method is described in Section 5. Write a function called clean data, which will also have
no parameters. The functionality of this method is similarly described in Section 6.
5 Format data
Within the function format data, the data stored within raw user data should be processed and output to
a global variable called formatted user data. The data are initially provided in the CSV format, with the
delimiter being the ’,’ character. The first column of the data is the title and full name of the user. The second
and third columns are the date of birth, and age of the user, respectively. Finally, the fourth column is the
email of the user. Ensure that the dataset is converted into the appropriate format, outlined in Table 1. This
data should be saved in the JSON format (you may use any built in JavaScript method for this). The key for
each of the values should be names shown in the ’Data name’ column, however converted to lower case with an
underscore instead of a space character eg ’first name’.
6 Data cleaning
Within the function clean data, the data cleaning tasks should be carried out, loading the data stored in
formatted user data. All of this code may be written within the clean data function, or may be handled by
a series of functions that are called within this class. The latter option is generally considered better practice.
Examine the data in order to determine which values are in the incorrect format or where values may be missing.
If a value is in the incorrect format then it must be converted to be in the correct format. If a value is missing or
incorrect, then an attempt should be made to fill in that data given the other values. The cleaned data should
be saved into the global variable cleaned user data.
7 Queries
Often, once the data has been processed, we perform a series of data analysis tasks on the cleaned data. Each
of these queries are outlined in Table 2. Write a function with the name given in the ’Function name’ column,
that carries out the query given in the corresponding ’Query description’. The answer should be returned by
the function, and not stored locally or globally.
Function name Query description
most common surname What is the most common surname name?
average age What is the average age of the users, given the values stored in the ’age’ column?
This should be a real number to 3 significant figures.
youngest dr Return all of the information about the youngest individual in the dataset with
the title Dr.
most common month What is the most common month for individuals in the data set?
percentage titles What percentage of the dataset has each of the titles? Return this in the form
of an array, following the order specified in the ’Title’ row of Table 1. This
should included the blank title, and the percentage should be rounded to the
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