Why strings are mutable in Ruby - See It in Action

Why strings are mutable in Ruby

📖 Scenario: Imagine you are writing a program that needs to change words or sentences many times, like editing a message or building a sentence step by step.

🎯 Goal: You will learn why strings in Ruby can be changed after they are created, and how to see this in action with simple code.

📋 What You'll Learn

Create a string variable with a specific value

Modify the string by changing part of it

Show the string before and after the change

Understand that strings in Ruby can be changed (mutable)

💡 Why This Matters

🌍 Real World

Many programs need to change text often, like chat apps, text editors, or games showing messages.

💼 Career

Understanding mutable strings helps you write efficient Ruby code that handles text well, a common task in software development.

1

Create a string variable

Create a string variable called message and set it to the value "Hello".

Ruby

# Create a string variable called message and set it to "Hello"
# Your code here

Need a hint?

Use = to assign the string "Hello" to the variable message.

2

Add a helper variable for new text

Create a variable called new_text and set it to the value " World" (note the space before World).

Ruby

message = "Hello"
# Create a variable called new_text and set it to " World"
# Your code here

Need a hint?

Remember to include the space before the word "World" in the string.

3

Modify the string using mutation

Use the message variable and add new_text to it by using the concat method to change message itself.

Ruby

message = "Hello"
new_text = " World"
# Use message.concat(new_text) to add new_text to message
# Your code here

Need a hint?

The concat method changes the original string instead of making a new one.

4

Print the modified string

Print the message variable to show the changed string.

Ruby

message = "Hello"
new_text = " World"
message.concat(new_text)
# Print the message variable
# Your code here

Need a hint?

Use puts message to print the string.