Nested Try-catch Blocks

try-catch.md

try {
    throw new Error()
    console.log('A')
    try {
        console.log('B')
    } catch (e) {
        console.log('C')
    }
} catch(e) {
    console.log('D')
} finally {
    console.log('E')
}

Console Output:

> D
> E

---

try {
    // throw new Error()
    console.log('A')
    try {
        console.log('B')
    } catch (e) {
        console.log('C')
    }
} catch(e) {
    console.log('D')
} finally {
    console.log('E')
}

Console Output:

> A
> B
> E

---

(_ => {
    try {
        throw new Error();
        return 0;
    } catch (e) {
        return 1;
    } finally {
        return 2;
    }
})();

Returned:

2

如果从finally块中返回一个值，那么这个值将会成为整个try-catch-finally的返回值，无论是否有return语句在try和catch中。这包括在catch块里抛出的异常。

References: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/try...catch