my_array = Array.new
my_array = []

players = []
players[0] = "Ronaldo"
players[1] = "Messi"
players[3] = "Lewandowski"
players # => ["Ronaldo", "Messi", "Lewandowski"]

players = []
players[0] = "Iniesta"
players[2] = "Suarez"
players[4] = "Rooney"
players # => ["Iniesta", nil, "Suarez", nil, "Rooney"]

players # => []
players << "Buffon"
players << "Casillas"
players << "Neuer"
players # => ["Buffon", "Casillas", "Neuer"]

defenders = ["Ramos", "Pique", "Alba"]

goalkeepers = ["Hart", "Cech", "Courtois"]
defenders = []
midfielders = ["Wilshere", "Fabregas", "Lampard"]

goalkeepers.empty? # => false
defenders.empty? # => true
midfielders.empty? # => false

defenders = ["Terry", "Marcelo", "Boateng"]
defenders.empty? # => false

goalkeepers.include?("Hart") # => true
defenders.include?("Marcelo") # => true
midfielders.include?("Modric") # => false

midfielders << "Modric"
midfielders.include("Modric") # => true

goalkeepers.first # => "Hart"
goalkeepers.first(2) # => ["Hart", "Cech"]

defenders.last # => "Boateng"
defenders.last(2) # => ["Marcelo", "Boateng"]

midfielders.index("Lampard") # => 2

goalkeepers.size # => 3
defenders.length # => 3
midfielders.count # => 4

goalkeepers = ["Hart", "Cech", "Courtois"]
defenders = ["Terry", "Marcelo", "Boateng"]
midfielders = ["Wilshere", "Fabregas", "Lampard", "Modric"]

goalkeepers.pop # => "Courtois"
goalkeeperes # => ["Hart", "Cech"]

midfielders.pop(2) # => ["Lampard", "Modric"]
midfielders # => ["Wilshere", "Fabregas"]

goalkeepers.shift # => "Hart"
goalkeepers # => ["Cech"]

defenders.delete("Terry")
defenders # => ["Marcelo", "Boateng"]

deleted_goalie = goalkeepers.pop
deleted_goalie # => "Courtois"
deleted_midfielders = midfielders.shift(2)
deleted_midfiedlers # => ["Wilshere", "Fabregas"]
deleted_defenders = defenders.delete("Terry")
deleted_defenders #=> "Terry"

goalkeepers = ["Cech"]
defenders = ["Marcelo", "Boateng"]
midfielders = []

players = goalkeepers + defenders + midfielders
players # => ["Cech", "Marcelo", "Boateng"]