在Coffeescript中格式化多重for-in循环

Question

有没有办法如何格式化多个内部for-in循环以写入更多行？

例子：

numbers = [1..20] 
addLetters= (number) -> 
    pairs = [] 
    pairs.push number+"A" 
    pairs.push number+"B" 
    pairs 

console.log pair for pair in addLetters number for number in numbers 

所需的格式，是这样的：

# NOT WORKING 
console.log pair 
    for pair in addLetters number 
     for number in numbers 

JSFiddle

Answer 1

你的 “不工作” 环路内而外。外环先走：

for number in numbers 
    for pair in addLetters number 
     console.log pair 

此外，您的addLetters功能过于复杂。

addLetters = (number) -> 
    [ "#{number}A", "#{number}B" ] 

演示：http://jsfiddle.net/ambiguous/b9p1v87m/

你可以用一个数组文本构建返回数组