Ruby学习之数组的使用

#实际数组中只有一个元素
a = [ "first" "second" "third" "four" "five"]

puts a
puts a.class
puts a.length
#索引最后一个元素
puts a[-1]
#为空
puts a[-2]

#数组中定义了五个元素
a = [ "first","second","third","four","five"]

puts a
puts a.class
puts a.length
puts a[-1]
#索引倒数第二个元素
puts a[-2]
#
puts a[0..3]