Javascript 咖啡脚本无间断切换
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coffee script switch without break
提问by puchu
Is it possible to use switch in coffeescript without break?
是否可以在咖啡脚本中不间断地使用 switch？
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:
... ...
I thought this will work but failed:
我认为这会奏效，但失败了：
switch code
when 37 then continue
when 38 then continue -> not valid
when 39 then continue
when 40
...
回答by Linus Gustav Larsson Thiel
Not really. From the docs:
并不真地。从文档：
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.
JavaScript 中的 switch 语句有点笨拙。您需要记住在每个 case 语句的末尾打断，以避免意外落入默认 case。CoffeeScript 可以防止意外失败，并且可以将 switch 转换为可返回、可赋值的表达式。格式为：switch 条件，when 子句，else 默认情况。
What you can do, though, is specify several values in a case, if they are to be treated equally:
但是，case如果要平等对待它们，您可以在 a 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
回答by Ron Martinez
You can use line continuation to help with this. For example:
您可以使用换行符来帮助解决此问题。例如：
name = 'Jill'
switch name
when 'Jill', \
'Joan', \
'Jess', \
'Jean'
$('#display').text 'Hi!'
else
$('#display').text 'Bye!'
回答by portforwardpodcast
It's totally possible, just use a classic javascript and pass it through with backtics
这是完全可能的，只需使用经典的 javascript 并通过 backtics 传递它
`
switch (code) {
case 37:
case 38:
case 39:
case 40:
// do the work of all four
default:
//default
}
`
回答by Koen.
Old question already, but if you place the commas on the next line, it works as expected, without the backslash line continuation showed by @Ron Martinez
老问题了，但如果你把逗号放在下一行，它会按预期工作，没有@Ron Martinez 显示的反斜杠行延续
switch code
when 37
, 38
, 39
, 40
console.log "Some Number"
else
console.log "Default"
Which will compile to:
这将编译为：
switch (code) {
case 37:
case 38:
case 39:
case 40:
return console.log("Some Number");
default:
return console.log("Default");
}
