V8 与 SpiderMonkey 的 catch(e if e..) 的等价

发布于 2024-10-11 04:42:57 字数 740 浏览 3 评论 0原文

使用 SpiderMonkey，您可以利用条件 catch 块将异常路由到适当的处理程序。

try {
// function could throw three exceptions
getCustInfo("Lee", 1234, "[email protected]")
}
catch (e if e == "InvalidNameException") {
// call handler for invalid names
bad_name_handler(e)
}
catch (e if e == "InvalidIdException") {
// call handler for invalid ids
bad_id_handler(e)
}
catch (e if e == "InvalidEmailException") {
// call handler for invalid email addresses
bad_email_handler(e)
}
catch (e){
// don't know what to do, but log it
logError(e)
}

来自 MDN 的示例

但是，在 V8 中，此代码无法编译，任何建议或除显而易见的解决方案之外的解决方案都无法编译。

原文

Using SpiderMonkey you can utilize conditional catch blocks to route exceptions to the appropriate handler.

try {
// function could throw three exceptions
getCustInfo("Lee", 1234, "[email protected]")
}
catch (e if e == "InvalidNameException") {
// call handler for invalid names
bad_name_handler(e)
}
catch (e if e == "InvalidIdException") {
// call handler for invalid ids
bad_id_handler(e)
}
catch (e if e == "InvalidEmailException") {
// call handler for invalid email addresses
bad_email_handler(e)
}
catch (e){
// don't know what to do, but log it
logError(e)
}

example from MDN

However in V8 this code wont compile, any suggestions, or work arounds other than the obvious.

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ぃ双果 2024-10-18 04:42:57

据我所知，其他 JavaScript 引擎没有类似的功能。

但是使用此功能很容易将代码转换

try {
    A
} catch (e if B) {
    C
}

为仅使用所有 JavaScript 引擎支持的标准功能的代码：

try {
    A
} catch (e) {
    if (B) {
        C
    } else {
        throw e;
    }
}

您给出的示例更容易翻译：

try {
    getCustInfo("Lee", 1234, "[email protected]");
} catch (e) {
    if (e == "InvalidNameException") {
        bad_name_handler(e);
    } else if (e == "InvalidIdException") {
        bad_id_handler(e);
    } else if (e == "InvalidEmailException") {
        bad_email_handler(e);
    } else {
        logError(e);
    }
}

There's no similar feature in the other JavaScript engines as far as I know.

But it is easy to convert code using this feature:

try {
    A
} catch (e if B) {
    C
}

into code that just uses standard features that all the JavaScript engines support:

try {
    A
} catch (e) {
    if (B) {
        C
    } else {
        throw e;
    }
}

The example you gave is even easier to translate:

try {
    getCustInfo("Lee", 1234, "[email protected]");
} catch (e) {
    if (e == "InvalidNameException") {
        bad_name_handler(e);
    } else if (e == "InvalidIdException") {
        bad_id_handler(e);
    } else if (e == "InvalidEmailException") {
        bad_email_handler(e);
    } else {
        logError(e);
    }
}

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