rspec exercises - lhl wk1e

1_hello_world.rb

### SETUP
require 'rspec'

### LOGIC (fix me)

def hello(who)
  "hello #{who}!"
end

### 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)
  if numbers.class == Array
    if !numbers.empty?
      sum = 0
      numbers.each do |n|
        n = n.to_f
        sum += n
      end
      sum / numbers.size
    else
      return nil
    end
  else
    return nil
  end
end

### 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