1_hello_world.rb

### SETUP
require 'rspec'

### LOGIC (fix me)
class HelloWorld

  def hello
    @hello
  end 

  def initialize(who)
   @hello = who
   puts "hello #{who}!"
  end

end 

# greeting = HelloWorld.new('world')
# greeting.hello

# TEST CODE (don't touch me)

describe '#hello' do
  it 'returns "hello world!" when "world" is passed in' do
    result = hello('world')
    expect(result).to eq('hello world!')
  end
end

2_arrays.rb

### SETUP
require 'rspec'

### LOGIC (fix me)

# Returns the average of all the numbers in the array

def average(numbers)
    sum = 0
    if numbers == nil
      return nil
    end
    if numbers.empty? 
      return nil
    end
    numbers.each do |n|
    sum += n.to_f 
    end
    sum / numbers.size
end

# puts average(nil)

#TEST CODE (don't touch me)

describe '#average' do
  it 'returns nil for empty array' do
    result = average([])
    expect(result).to be_nil
  end
  it 'returns nil when nil is passed in' do
    result = average(nil)
    expect(result).to be_nil
  end
  it 'returns 4 for 3,4,5' do
    result = average([3, 4, 5])
    expect(result).to eq(4)
  end
  it 'can handle numbers represented as strings' do
    result = average([10, '20', 30])
    expect(result).to eq(20)
  end
  it 'can handle floats' do
    result = average([1.0, 1.5, 2.0])
    expect(result).to eq(1.5)
  end
end