Error Handling in Node.js

Re:Error Handling in Node.js by morghus on Friday November 04, 2016 @06:15AM (#12871463)

Can anyone explain why this pattern doesn't work? Or point me to some resource?

  function myApiFunc(callback)
  {
    /*
     * This pattern does NOT work!
     */
    try {
      doSomeAsynchronousOperation(function (err) {
        if (err)
          throw (err);
        /* continue as normal */
      });
    } catch (ex) {
      callback(ex);
    }
  }

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Re:Error Handling in Node.js by iotscale on Friday November 04, 2016 @06:47AM (#12871593)

Try/catch is not async and exceptions do not bubble up through the async context, which makes sense as the caller moved on with execution. Try this in your console:

    try {
        console.log("see, ");
        setTimeout(() => {throw new Error("oops")}, 100);
        console.log(
            "I can't assume here that"
            + " the prev. line succeeded"
        );
    } catch(e) {
        console.log("error!");
    }

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Re:Error Handling in Node.js by mikevin on Friday November 04, 2016 @06:22AM (#12871493)

There's a footnote about this: https://www.joyent.com/node-js/production/design/errors#fn:1

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Re:Error Handling in Node.js by morghus on Friday November 04, 2016 @06:43AM (#12871580)

much obliged

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