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Convert array of key value object to object of the key values (ruby)

2014-09-02 16:20 489 查看

I have a list of objects that have key attribute and value attribute.

I would like to convert it to an object that contains attributes named as keys with the values.

Example will make it clearer...

This

[{
:key => "key1",
:value => "value1"
}, {
:key => "key2",
:value => "value2"
}]

Should become like this:

{
:key1 => "value1"
:key2 => "value2"
}

I'm sure there is one line to make it happen Thanks

Using

Hash::[]

Array#map

a = [{
:key => "key1",
:value => "value1"
}, {
:key => "key2",
:value => "value2"
}]

Hash[a.map { |h| [h[:key], h[:value]] }]
# => {"key1"=>"value1", "key2"=>"value2"}

Hash[a.map { |h| h.values_at(:key, :value) }]
# => {"key1"=>"value1", "key2"=>"value2"}

Hash[a.map { |h| [h[:key].to_sym, h[:value]] }]
# => {:key1=>"value1", :key2=>"value2"}

a.each_with_object({}) {|h,g| g.update({h[:key].to_sym => h[:value]}) }
# => {:key1=>"value1", :key2=>"value2"}

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