在这段代码中：
arr = [ { id: 1,body: 'foo'},{ id: 2,body: 'bar' },{ id: 3,body: 'foobar' }]
arr.map { |h| h[:id] } # => [1,2,3]
Underscore.js has pluck,我想知道是否有一个Ruby等价物.
解决方法
如果你不介意猴子修补,你可以自己去采摘：
arr = [{ id: 1,body: 'foobar' }]
class Array
def pluck(key)
map { |h| h[key] }
end
end
arr.pluck(:id)
=> [1,3]
arr.pluck(:body)
=> ["foo","bar","foobar"]
而且,它看起来像someone has already generalised this for Enumerables,还有别人for a more general solution.