Keyword arguments in Ruby - Cheat Sheet & Quick Revision

Recall & Review

beginner

What are keyword arguments in Ruby?

Keyword arguments are a way to pass arguments to a method by explicitly naming them, making the code easier to read and arguments easier to manage.

beginner

How do you define a method with keyword arguments in Ruby?

You define keyword arguments by listing them with colons in the method parameters, like def greet(name:, age:).

intermediate

What happens if you call a method with keyword arguments but omit one required keyword?

Ruby raises an ArgumentError because the method expects all required keyword arguments to be provided.

intermediate

How can you provide default values for keyword arguments in Ruby?

You assign a default value in the method definition like def greet(name:, age: 18). If the caller omits age, it uses 18.

beginner

What is the benefit of using keyword arguments over positional arguments?

Keyword arguments improve code readability and reduce errors by clearly naming each argument, so the order does not matter.

How do you call a Ruby method def order(item:, quantity:) with keyword arguments?

A order('apple', 3)

B order(item: 'apple', quantity: 3)

C order('item' => 'apple', 'quantity' => 3)

D order(item = 'apple', quantity = 3)

Keyword arguments are passed by naming them with colons, like item: 'apple'.

What error occurs if a required keyword argument is missing when calling a method?

A TypeError

B NoMethodError

C SyntaxError

D ArgumentError

Ruby raises an ArgumentError if a required keyword argument is not provided.

How do you set a default value for a keyword argument in Ruby?

A def method(arg: 5)

B def method(arg:)

C def method(arg => 5)

D def method(arg = 5)

Default values for keyword arguments are set with arg: 5 in the method definition.

Which is a benefit of keyword arguments?

A They allow arguments to be passed in any order.

B They require fewer lines of code.

C They automatically convert types.

D They make methods run faster.

Keyword arguments let you pass arguments in any order by naming them explicitly.

What is the correct way to define a method with two required keyword arguments name and age?

A def method(name, age)

B def method(name =, age =)

C def method(name:, age:)

D def method(name =>, age =>)

Keyword arguments are defined with colons after the names: name:, age:.

Explain how keyword arguments improve method calls in Ruby.

Think about how naming each argument helps when calling methods.

Describe how to define keyword arguments with default values and what happens if you omit them when calling the method.

Look at how to assign values in the method definition.