# To delete, assign an empty array
# To insert, assign to a zero-width slice
p a = ('a'..'e').to_a # => ['a','b','c','d','e']
p a[0,2] = ['A','B'] # a now holds ['A', 'B', 'c', 'd', 'e']
p a[2...5]=['C','D','E'] # a now holds ['A', 'B', 'C', 'D', 'E']
p a[0,0] = [1,2,3] # Insert elements at the beginning of a
p a[0..2] = [] # Delete those elements
p a[-1,1] = ['Z'] # Replace last element with another
p a[-1,1] = 'Z' # For single elements, the array is optional
p a[1,4] = nil # Ruby 1.9: a now holds ['A',nil]
# Ruby 1.8: a now holds ['A']: nil works like []