[英]how do I search for a string value inside an array stored in a hash
我在軌道上使用ruby,試圖找出是否可以(和/或如何)在數組中搜索特定字符串值的哈希值? 如果有匹配項(找到鮑勃),我希望它返回True。
```
string_query = "Bob@gmail.com"
email_array is the following:
[
[0] {
"email" => "bill@gmail.com",
"name" => "william"
},
[1] {
"email" => "mike@gmail.com",
"name" => "michael"
},
[2] {
"email" => "Bob@gmail.com",
"name" => "robert"
}
]
```
我在堆棧溢出中看到了此示例-但它是數字。 我的是繩子。 如何基於哈希值從數組中獲取哈希?
非常感謝。
我現在不在,還沒有嘗試過,但是可以用
string_query = "Bob@gmail.com"
email_array.each do |s|
if s['email'] == string_query
#your comparision statements here
end
end
string_query = "Bob@gmail.com"
email_array = [{
"email" => "bill@gmail.com",
"name" => "william"
},
{
"email" => "mike@gmail.com",
"name" => "michael"
},
{
"email" => "Bob@gmail.com",
"name" => "robert"
},
{
"email" => "Bob@gmail.com",
"name" => "robert2"
}
]
如果要選擇所有匹配的哈希,可以使用select
email_array.select {|hash| hash["email"] == string_query }
#=> [{"email"=>"Bob@gmail.com", "name"=>"robert"}, {"email"=>"Bob@gmail.com", "name"=>"robert2"}]
如果您只想檢查true
或false
,請使用其中的any?
email_array.any? {|hash| hash["email"] == string_query }
#=> true
如果您只對第一實例感興趣。 您可以使用detect
email_array.detect {|hash| hash["email"] == string_query }
#=> {"email"=>"Bob@gmail.com", "name"=>"robert"}
你可以這樣做
email_array.select {|hash| hash["email"] == string_query }.present?
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