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file 22 lines (15 sloc) 0.14 kb
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a = [1, 2, 3]

puts a.size
# => 3

puts a[0]
# => 1

puts a[-1]
# => 3

a << 4
puts a[3]
# => 4

puts a[4]
# =>

a[1] = 5
puts a[1]
# => 5
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