empty = Array.new # []: returns a new empty array
nils = Array.new(3) # [nil, nil, nil]: new array with 3 nil elements
zeros = Array.new(4, 0) # [0, 0, 0, 0]: new array with 4 0 elements
copy = Array.new(nils) # Make a new copy of an existing array
count = Array.new(3) {|i| i+1} # [1,2,3]: 3 elements computed from index