Notes for B.1.4 Sensible Grouping for Data Items - IB | RevisionDojo
B.1.4 Sensible Grouping for Data Items Notes
When working with collections of data, it's important to group related data items in a way that makes sense for the problem you're trying to solve.
Grouping data items helps you organise and access information efficiently.
Reason Behind Grouping Data
Organise related information: Keep data that belongs together in one place.
Access data efficiently:Retrieve specific information quickly.
Maintain data integrity: Ensure that related data items stay together.
Examples of Sensible Grouping
Example
Tabular Representation:
One common way to group data is using a table, where each row represents a record and each column represents a field.
Consider a tablestoring information about students:
Each row represents a student.
Each column represents a specific attribute (Student ID, Name, Age, Grade).
Student ID
Name
Age
Grade
001
Alice
16
10
002
Bob
17
11
003
Carol
16
10
Example
Parallel Lists:
Another approach is to use parallel lists, where each list stores a specific attribute, and the same index across lists represents a single record.
Using the student example above, you could have:
student_ids = [001, 002, 003]
names = ["Alice", "Bob", "Carol"]
ages = [16, 17, 16]
grades = [10, 11, 10]
Here, names[0] corresponds to student_ids[0], ages[0], and grades[0], representing the same student.
Common Mistake
We often forget to keep the listssynchronized.
If you add or remove an item from one list, you must do the same for all other lists to maintain data integrity.
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Note
Introduction to Data Grouping
When working with collections of data, it's important to group related data items in a way that makes sense for the problem you're trying to solve.
Grouping data items helps you organise and access information efficiently.
DefinitionData GroupingThe process of organising related data items together in a structured way.
AnalogyThink of data grouping like organising your closet. You keep shirts together, pants together, and shoes together, so you can easily find what you need.
ExampleIn a contact list, grouping a person's name, phone number, and email address together makes it easy to find all their information.
