Question

我正在使用Ruby学习编程，我不得不构建自己的排序方法。

我正在努力弄清楚为什么recursive_sort中的比较方法会抛出错误

chapter10.rb:120:in `block in recursive_sort': undefined method `<' for ["zebra"]:Array (NoMethodError)

但这很好用......

lowest = 'zebra'
if 'cat' < 'zebra'
    lowest = 'cat'
end
puts lowest

有人可以把正确的方向放在可以帮助我绕过这个的东西上吗？谢谢！

puts 'Sorting Program with recursion v1.0'

# Keep two more lists around
# One for already-sorted words
# One for still - unsorted words
# Find the smallest word in the unsorted list
# push it into the end of the sorted_array

def sort some_array
    recursive_sort some_array, []
end

def recursive_sort unsorted_array, sorted_array
    lowest = unsorted_array[0]
    unsorted_array.each do |uns|
        if uns < lowest
            lowest = uns
        end
    end
    puts lowest
end

# Get a list of unsorted words into an array
orig_array = []
word = 'placeholder'
puts 'Enter a list of words to be sorted. Press enter when done.'
while word != ''
    word = gets.chomp
    orig_array.push [word]
end
orig_array.pop

puts 'This is the output of the built in sort method.'
orig_array.sort.each do |un|
    puts un
end

puts 'This is the output of Rick\'s sort method.'
sort orig_array

Answer 1

orig_array.push [word]

在这里，您实际上是将数组推入数组，以便orig_array成为

[["word 1"], ["word 2"], ["word 3"], ...]

移除[]周围的word以解决此问题，或将.push更改为+=或.concat，这会将两个阵列粘合在一起。< / p>

学习Ruby - 坚持数组中的字符串比较

1 个答案: