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--- layout: api id: promise.try title: Promise.try --- [← Back To API Reference](/docs/api-reference.html) <div class="api-code-section"><markdown> ##Promise.try ```js Promise.try(function() fn) -> Promise ``` ```js Promise.attempt(function() fn) -> Promise ``` Start the chain of promises with `Promise.try`. Any synchronous exceptions will be turned into rejections on the returned promise. ```js function getUserById(id) { return Promise.try(function() { if (typeof id !== "number") { throw new Error("id must be a number"); } return db.getUserById(id); }); } ``` Now if someone uses this function, they will catch all errors in their Promise `.catch` handlers instead of having to handle both synchronous and asynchronous exception flows. *For compatibility with earlier ECMAScript version, an alias `Promise.attempt` is provided for [`Promise.try`](.).* </markdown></div> <div id="disqus_thread"></div> <script type="text/javascript"> var disqus_title = "Promise.try"; var disqus_shortname = "bluebirdjs"; var disqus_identifier = "disqus-id-promise.try"; (function() { var dsq = document.createElement("script"); dsq.type = "text/javascript"; dsq.async = true; dsq.src = "//" + disqus_shortname + ".disqus.com/embed.js"; (document.getElementsByTagName("head")[0] || document.getElementsByTagName("body")[0]).appendChild(dsq); })(); </script> <noscript>Please enable JavaScript to view the <a href="https://disqus.com/?ref_noscript" rel="nofollow">comments powered by Disqus.</a></noscript>
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