计算和计算红宝石中单词的平均长度 [英] Counting and computing the average length of words in ruby
问题描述
我正在尝试用ruby调试程序,该程序用于计算和打印数组中单词的平均长度.
I'm trying to debug a program in ruby that is meant to compute and print the average length of words in an array.
words = ['Four', 'score', 'and', 'seven', 'years', 'ago', 'our', 'fathers', 'brought', 'forth', 'on', 'this', 'continent', 'a', 'new', 'nation', 'conceived', 'in', 'Liberty', 'and', 'dedicated', 'to', 'the', 'proposition', 'that', 'all', 'men', 'are', 'created', 'equal']
word_lengths = Array.new
words.each do |word|
word_lengths << word_to.s
end
sum = 0
word_lengths.each do |word_length|
sum += word_length
end
average = sum.to_s/length.size
puts "The average is " + average.to_s
很显然,该代码无法正常工作.运行程序时,我收到一条错误消息,提示不能将字符串'+'强制转换为fixnum(typeerror).
Obviously, the code is not working. When I run the program, I receive an error message that says the string '+' can't be coerced into fixnum (typeerror).
我怎么办才能使代码不计算数组中字符串的平均长度?
What do I do no make the code compute the average length of the strings in the array?
推荐答案
尝试:
words.join.length.to_f / words.length
说明:
这一起利用了 chaining 方法.首先,words.join
给出了数组中所有字符的字符串:
This takes advantage of chaining methods together. First, words.join
gives a string of all the characters from the array:
'Fourscoreandsevenyearsagoourfathersbroughtforthonthiscontinentanewnationconcei
vedinLibertyanddedicatedtothepropositionthatallmenarecreatedequal'
然后我们应用length.to_f
给出长度作为浮点数(使用浮点数可确保获得准确的最终结果):
We then we apply length.to_f
giving the length as a float (using a float ensures an accurate final result):
143.0
然后使用/ words.length
将以上内容相除:
We then divide the above using / words.length
:
4.766666666666667
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