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4 UNDERSTANDING ARRAYS &
COLLECTIONS
Learning Outcomes
Introduction What are Collections?
What are Arrays? How can we Iterate Over Collections?
Modifying Collections
INTRODUCTION
In the previous chapter, you had learned about functions. In this chapter, you are going to
learn how to work with a large set of data in programming.
WHAT ARE COLLECTIONS?
A collection is a container which groups multiple elements into a single object. Collections
are used to store, retrieve and manipulate stored data.
Example of collection:
Collection of cards
Telephone directory
Advantages of collection:
It groups multiple elements into a common set.
It increases the performance of the program.
It increases productivity, which means based on the requirement the size could be get
altered even after its declaration.
It consumes less memory.
It can hold both homogeneous and heterogeneous elements.
Experiential Learning
Coding Task 01
Is 36 a perfect square?
In this task, you will learn to write an algorithm to know if a number is a perfect square
or not.
60 Touchcode-VII

