Variable-length arguments (*args) in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a method that accepts any number of arguments.

Ruby

def greet([1])
  puts "Hello, #{args.join(', ')}!"
end

Drag options to blanks, or click blank then click option'

A*args

B&args

Cargs

D**args

Attempts:

3 left

💡 Hint

Common Mistakes

Using &args instead of *args, which is for blocks.

Using **args which is for keyword arguments.

Not using any symbol, which only accepts one argument.

Using *args allows the method to accept any number of arguments as an array.

2fill in blank

medium

Complete the code to call the method with multiple arguments.

Ruby

greet([1])

Drag options to blanks, or click blank then click option'

A"Alice", "Bob", "Carol"

B"Alice"

C["Alice", "Bob"]

D:Alice, :Bob

Attempts:

3 left

💡 Hint

Common Mistakes

Passing an array instead of separate arguments.

Passing symbols instead of strings.

Passing only one argument when multiple are needed.

Passing multiple arguments separated by commas matches the *args parameter.

3fill in blank

hard

Fix the error in the method definition to correctly accept variable arguments.

Ruby

def sum_numbers([1])
  sum = 0
  args.each { |num| sum += num }
  sum
end

Drag options to blanks, or click blank then click option'

A&args

Bargs

C*args

D**args

Attempts:

3 left

💡 Hint

Common Mistakes

Using args without * causes an error because it expects one argument.

Using &args is for blocks, not variable arguments.

Using **args is for keyword arguments.

The method must use *args to accept variable-length arguments as an array.

4fill in blank

hard

Fill both blanks to create a method that sums only positive numbers from variable arguments.

Ruby

def sum_positive([1])
  args.select { |n| n [2] 0 }.sum
end

Drag options to blanks, or click blank then click option'

A*args

B>

C>=

Dargs

Attempts:

3 left

💡 Hint

Common Mistakes

Using args without * causes errors.

Using >= includes zero, which is not positive.

Using < or <= selects negative or zero numbers.

*args collects all arguments, and > filters positive numbers.

5fill in blank

hard

Fill all three blanks to define a method that prints each argument with its index.

Ruby

def print_args([1])
  args.each_with_index do |[2], [3]|
    puts "#{index}: #{arg}"
  end
end

Drag options to blanks, or click blank then click option'

A*args

Barg

Cindex

Dargs

Attempts:

3 left

💡 Hint

Common Mistakes

Using args without * causes errors.

Swapping the order of block variables.

Using wrong variable names in the block.

*args collects arguments, and each_with_index provides each argument and its index.