Streams can help with many things in Node, here are a few: Enables calendar and numberingSystem options for Intl.DateTimeFormat.Some other things that are in v8.1 include: So if something happens in our app and it returns null, the operator moves on to maybe an error message or a default value (the value on the right-hand side of the operand) and gives the user something to see. This helps a lot with values that are returned null or undefined when we were not expecting them to do so. So in the second example, it was a 0 on the left because that is not null or undefined, it returned with the 0 number. The value on the left-hand has to be null or undefined for the right-hand value to be ran. log (newVersion ) // expected output: "Does this work?" const nullishTest = 0 ? 55 Ĭonsole. Let's see that in action: const newVersion = null ? 'Does this work?' Ĭonsole. Otherwise, the results from the left expression are returned. The operator returns the results of the expression to the right of the operator only when the expression to the left of it is null or undefined. The nullish coalescing operator looks like this: ?. There are a handful of things that were added into this version one that we'll cover here is the nullish coalescing operator. This Node.js v14.x release also comes with the newly upgraded Javascript engine: v8.1! "Diagnostic Reporting is now stable in Node.js v14!" Visit this page for the official docs on diagnostic reporting in Node.js and other ways to use the command. There are many different variations to this command. js: Where we are running the diagnostic report. It lets us know of all the errors that would cause our js applications to stop working. -report -on -fatalerror: Reports all the fatal errors.-report -on -signal: This will allow for reports to be generated when a specific signal is sent to the Node.js process.We want to make sure all errors are caught and handled. -report -uncaught -exception: The report will generate on uncaught exceptions.To run the report, run the following in your command line: node -report-uncaught-exception -report-on-signal \ We now have it as a stable feature in this new version. We can run this report in development, testing, or production.īack when Node.js v12 was released, diagnostic reporting was experimental. Even if our app were to crash, this report would have information on that as well. When things go wrong in your app, like slow performance or memory leaks, it's helpful to have a full report on where issues are occurring. Tweet This Diagnostic Reporting is now stable!ĭiagnostic reporting generates a JSON-formatted file that can aid in diagnosing problems.
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