each_with_index method

@numbers = [1, 0, 3, 2, 5, 4, 7, 6, 9, 8]

# all numbers with index:
@numbers.each_with_index{|number, i| puts "#{i}: #{number}"}

# output
# 0: 1
# 1: 0
# 2: 3
# 3: 2
# 4: 5
# 5: 4
# 6: 7
# 7: 6
# 8: 9
# 9: 8

# the even status for all numbers, with index:
@numbers.each_with_index{|number, i| puts "#{i}: #{number.even?}"}

# output 
# 0: false
# 1: true
# 2: false
# 3: true
# 4: false
# 5: true
# 6: false
# 7: true
# 8: false
# 9: true

# leg counts for all pets, with index:
@inventory.each_with_index{|pet, i| puts "#{i}: #{pet.legs}"}

# output 
# 0: 4
# 1: 4
# 2: 0
# 3: 8
# 4: 6
# 5: 2
# 6: 0
    
# leg totals for each pet type, with index:
@inventory.each_with_index{|pet, i| puts "#{i}: #{pet.legs * pet.quantity}"}

# output
# 0: 400
# 1: 200
# 2: 0
# 3: 8
# 4: 60000
# 5: 4
# 6: 0    

@pokey_things.seek(0)
# letter counts for all pokey things, with index:
@pokey_things.each_with_index{|thing, i| puts "#{i}: #{thing.chomp.size}"}

# output 
# 0: 6
# 1: 4
# 2: 5
# 3: 41
    
@pokey_things.seek(0)
# all pokey things, capitalized, with index:
@pokey_things.each_with_index{|thing, i| puts "#{i}: #{thing.chomp.capitalize}"}

# output 
# 0: Cactus
# 1: Pole
# 2: Knife
# 3: Cactus holding poles with knives attached