"""
This is an example question. Write a function that determines if its argument is an even number. 
"""

## prefix_code ##
def is_even?(n)
## prefix_code ##
  return n ?%? 2 ?==? 0
## suffix_code ##
end
## suffix_code ##

## metadata ##
{
    "autograder" : "ruby"
}
## metadata ##

## test ##
describe is_even? do
  it "is true for even numbers" do
    expect(is_even?(2)).to be_truthy
  end
  it "is false for odd numbers" do
    expect(is_even?(3)).to be_falsy
  end
end
## test ##