添加到哈希表中的值 [英] adding to the value in a hash table

问题描述

我试图将散列值加1。我的逻辑看起来是正确的，但由于某种原因，我的哈希值不会递增。

I am trying to increment the value in a hash by one. My logic seems right, but for some reason my value in the hash is not incrementing by one.

  puts item_sold
  temp = sales_hash.values[item_sold] + 1
  sales_hash.values[item_sold] = temp
  puts sales_hash.values[item_sold]

sales_hash 是一个散列，其中的密钥是一个介于1000-2000之间的数字，每个密钥的值从0开始。 item_sold 是1到15之间的随机数。散列中有15个项目。当 temp 打印出来时，它的值是1。但是，当我打印出 sales_hash.values [item_sold] 的值时，它会打印0.什么是 sales_hash.values [item_sold] 不递增？

sales_hash is a hash where the key is a number between 1000-2000 and the value for each key starts at 0. item_sold is a random number between 1 and 15. There are 15 items in the hash. When temp prints out it is a value of one. However when I print out the value of sales_hash.values[item_sold] it prints 0. What is sales_hash.values[item_sold] not incrementing?

推荐答案

Hash＃values 返回所有散列值的数组。您想添加一个值，您可以这样做：

Hash#values returns an array of of all the hashes values. You want to add to one value, which you'd do like this:

item_sold
=> {0=>0, 1=>0, 2=>0}
item_sold[0] += 1
=> 1
item_sold
=> {0=>1, 1=>0, 2=>0}

您访问通过使用 hash [key] 语法获得散列值。

You access the value of a hash by by using the hash[key] syntax.

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