## 問題 Problem 你手里有個對象數組，你想將它映射為另一個數組，就像Python的列表解析。 You have an array of objects and want to map them to another array, similar to Python’s list comprehensions. ## 方法 Solution 使用列表解析，但是別忘了[數組映射](http://island205.com/chapters/arrays/mapping-arrays)。 Use a list comprehension, but don’t forget about?[mapping arrays](http://island205.com/chapters/arrays/mapping-arrays). ~~~ electric_mayhem = [ { name: "Doctor Teeth", instrument: "piano" }, { name: "Janice", instrument: "lead guitar" }, { name: "Sgt. Floyd Pepper", instrument: "bass" }, { name: "Zoot", instrument: "sax" }, { name: "Lips", instrument: "trumpet" }, { name: "Animal", instrument: "drums" } ] names = (muppet.name for muppet in electric_mayhem) # => [ 'Doctor Teeth', 'Janice', 'Sgt. Floyd Pepper', 'Zoot', 'Lips', 'Animal' ] ~~~ ## 討論 Discussion CoffeeScript直接支持列表解析，因此它們的工作方式與你在Python中所熟知的用法一直。對于簡單的映射，列表解析更加具有可讀性。針對更加復雜的轉換或者鏈式映射，[數組映射](http://island205.com/chapters/arrays/mapping-arrays)將更加合適。 Because CoffeeScript directly support list comprehensions, they work pretty much as advertised wherever you would use one in Python. For simple mappings, list comprehensions are much more readable. For complicated transformations or for chained mappings,?[mapping arrays](http://island205.com/chapters/arrays/mapping-arrays)?might be more elegant.