Local variables and naming conventions in Ruby - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a local variable in Ruby?

A local variable is a variable that is defined within a method or block and can only be used inside that method or block. It is not accessible outside its scope.

beginner

How do you name a local variable in Ruby?

Local variable names must start with a lowercase letter or an underscore (_), followed by letters, digits, or underscores. They cannot start with a capital letter or special characters.

beginner

Why should you use meaningful names for local variables?

Meaningful names make your code easier to read and understand, like giving clear labels to boxes so you know what's inside without opening them.

beginner

Which of these is a valid local variable name in Ruby? <br> A) myVar <br> B) _temp <br> C) 2ndValue <br> D) $globalVar

Both A) myVar and B) _temp are valid local variable names. C) 2ndValue is invalid because it starts with a digit. D) $globalVar is a global variable, not local.

beginner

What happens if you try to use a local variable outside its method or block?

Ruby will raise an error or treat it as nil because the local variable does not exist outside its defined scope.

Which character can a local variable name in Ruby start with?

A Lowercase letter or underscore (_)

B Uppercase letter

C Digit

D Dollar sign ($)

Local variable names must start with a lowercase letter or underscore.

What is the scope of a local variable in Ruby?

A Accessible anywhere in the program

B Accessible only inside the method or block where it is defined

C Accessible only inside classes

D Accessible only in global scope

Local variables are only accessible inside the method or block where they are defined.

Which of these is NOT a valid local variable name in Ruby?

A tempVar

B _count

C user_name

D 3value

Variable names cannot start with a digit.

Why is it important to use meaningful names for local variables?

A To make code harder to read

B To confuse other programmers

C To make code easier to understand

D To increase program speed

Meaningful names help make code easier to read and understand.

What symbol indicates a global variable in Ruby, not a local variable?

A $

B #

C _

D @

Global variables start with a dollar sign ($), local variables do not.

Explain what a local variable is and how you should name it in Ruby.

Think about where the variable can be used and how its name looks.

Why is it important to follow naming conventions for local variables in Ruby?

Consider how others read your code or how you read your own code later.