使用coffeescript中的for循环创建一个对象数组

Question

快速提问。我找不到用于从for循环创建对象的语法（假设它存在）。这样做的正确方法是什么 -

letters = ['a', 'b', 'c']
objs = (letter[index]:index for letter, index in letters)

#Also tryed..
objs = ({letter[index]:index} for letter, index in letters)

有什么想法吗？

Answer 1

coffee> letters = ['a', 'b', 'c']
[ 'a', 'b', 'c' ]
coffee> lettersToIndex = {}
{}
coffee> lettersToIndex[letter] = index for letter, index in letters
[ 0, 1, 2 ]
coffee> lettersToIndex
{ a: 0, b: 1, c: 2 }