javascript 尝试/抓住oneliner可用？
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Try/catch oneliner available?
提问by pimvdb
Just as you can convert the following:
正如您可以转换以下内容：
var t;
if(foo == "bar") {
t = "a";
} else {
t = "b";
}
into:
进入：
t = foo == "bar" ? "a" : "b";
, I was wondering if there is a shorthand / oneline way to convert this:
，我想知道是否有一种速记/单行方式来转换这个：
var t;
try {
t = someFunc();
} catch(e) {
t = somethingElse;
}
Is there a method of doing this in a shorthand way, preferably an oneliner? I could, of course, just remove the newlines, but I rather mean something like the ? :thing for if.
有没有办法以速记方式做到这一点，最好是oneliner？我当然可以，只是删除了换行，但我宁愿意思是这样的? :事情if。
Thanks.
谢谢。
采纳答案by rene
You could use the following function and then use that to oneline your try/catch. It's use would be limited and makes the code harder to maintain so i'll never use it.
您可以使用以下函数，然后使用它来联机您的 try/catch。它的使用会受到限制并使代码更难维护，所以我永远不会使用它。
var v = tc(MyTryFunc, MyCatchFunc);
tc(function() { alert('try'); }, function(e) { alert('catch'); });
/// try/catch
function tc(tryFunc, catchFunc) {
var val;
try {
val = tryFunc();
}
catch (e) {
val = catchFunc(e);
}
return val;
}
回答by In silico
No, there isn't a "one-liner" version of try-catchbesides simply removing all the newlines.
没有，没有的“一个班轮”的版本try-catch除了简单地删除所有换行符。
Why would you want to? Vertical space doesn't cost you anything.
你为什么要？垂直空间不会花费您任何费用。
And even if you'll settle for removing all the newlines, this, in my opinion, is harder to read:
即使您愿意删除所有换行符，在我看来，这也更难阅读：
try{t = someFunc();}catch(e){t = somethingElse;}
than this:
比这个：
try {
t = someFunc();
} catch(e) {
t = somethingElse;
}
What you have is perfectly fine. Readable code should be a priority. Even if it means more typing.
你所拥有的一切都很好。可读代码应该是一个优先事项。即使这意味着更多的打字。
回答by Chris
You can get it down to two lines.
您可以将其缩减为两行。
try { doSomething(); }
catch (e) { handleError(); }
Or, in your specific example, 3 lines.
或者，在您的具体示例中，3 行。
var t;
try { t = doSomething(); }
catch (e) { t = doSomethingElse(); }
Either way, if your code allows for it, a two liner is much more concise, IMO, than the typical try/catch block.
无论哪种方式，如果您的代码允许，那么两行代码比典型的 try/catch 块更简洁，IMO。
回答by coderaiser
There is one liner available as npm package try-catch. You can use it this way:
有一个 liner 可用作 npm 包try-catch。你可以这样使用它：
const tryCatch = require('try-catch');
const {parse} = JSON;
const [error, result] = tryCatch(parse, 'hello');
There is similar approach for async-awaittry-to-catch:
async-awaittry-to-catch也有类似的方法：
const {readFile} = require('fs').promises;
read('./package.json').then(console.log);
async function read(path) {
const [error, data] = await tryToCatch(readFile, path, 'utf8');
return data || error.message;
}
All this wrappers do is wrap one function with try-catchblock and uses destructuring to get result.
所有这些包装器所做的就是用try-catch块包装一个函数并使用解构来获得结果。
Also there is an ideato use something similar to Go style error handling:
还有一个想法是使用类似于Go 风格的错误处理：
// this is not real syntax
const [error, result] = try parse('hello');
