javascript - CoffeeScript 切换无中断

Question

是否可以在coffeescript中使用switch而不中断？

switch code                      switch (code) {
    when 37 then                     case 37: break;
    when 38 then           ->        case 38: break;
    when 39 then                     case 39: break;
    when 40                          case 40:
        ...                              ...

我认为这会起作用但失败了:

switch code
    when 37 then continue
    when 38 then continue  ->    not valid
    when 39 then continue
    when 40
        ...

Answer 1

不是真的。来自 the docs :

Switch statements in JavaScript are a bit awkward. You need to remember to break at the end of every case statement to avoid accidentally falling through to the default case. CoffeeScript prevents accidental fall-through, and can convert the switch into a returnable, assignable expression. The format is: switch condition, when clauses, else the default case.

不过，如果要同等对待的话，您可以在一个 case 中指定多个值:

switch day
  when "Mon" then go work
  when "Tue" then go relax
  when "Thu" then go iceFishing
  when "Fri", "Sat"
    if day is bingoDay
      go bingo
      go dancing
  when "Sun" then go church
  else go work