ruby - 如何在Ruby数组中计算相同的字符串元素

我有以下Array = ["Jason", "Jason", "Teresa", "Judah", "Michelle", "Judah", "Judah", "Allison"]
如何为每个相同元素生成计数？

Where:
"Jason" = 2, "Judah" = 3, "Allison" = 1, "Teresa" = 1, "Michelle" = 1?

或生成哈希，其中:

哪里:
杂凑= {“Jason” => 2，“犹大” => 3，“Allison” => 1，“Teresa” => 1，“Michelle” => 1}

最佳答案

names = ["Jason", "Jason", "Teresa", "Judah", "Michelle", "Judah", "Judah", "Allison"]
counts = Hash.new(0)
names.each { |name| counts[name] += 1 }
# => {"Jason" => 2, "Teresa" => 1, ....