Ruby 数组的rindex()函数
Array#rindex() : rindex()是一个数组类方法,用于返回数组中最后一个对象的索引。
语法。Array.rindex()
参数。数组
返回:数组中最后一个对象的索引。
如果不存在则为nil
例子 #1 :
# Ruby code for rindex() method
# declaring array
a = [18, 22, 33, nil, 5, 6]
# declaring array
b = [1, 4, 1, 1, 88, 9]
# declaring array
c = [18, 22, 50, 6]
# rindex method example
puts "rindex() method form : #{a.rindex(22)}\n\n"
puts "rindex() method form : #{b.rindex(1)}\n\n"
puts "rindex() method form : #{c.rindex(18)}\n\n"
输出:
rindex() method form : 1
rindex() method form : 3
rindex() method form : 0
例子 #2 :
# Ruby code for rindex() method
# declaring array
a = ["abc", "nil", "dog"]
# declaring array
c = ["cat", nil]
# declaring array
b = ["cow", nil, "dog"]
# rindex method example
puts "rindex() method form : #{a.rindex("abc")}\n\n"
puts "rindex() method form : #{b.rindex("cat")}\n\n"
puts "rindex() method form : #{c.rindex("cat")}\n\n"
输出:
rindex() method form : 0
rindex() method form :
rindex() method form : 0