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Edit: tap.md
--- layout: api id: tap title: .tap --- [← Back To API Reference](/docs/api-reference.html) <div class="api-code-section"><markdown> ##.tap ```js .tap(function(any value) handler) -> Promise ``` Essentially like `.then()`, except that the value passed in is the value returned. This means you can insert `.tap()` into a `.then()` chain without affecting what is passed through the chain. (See example below). Unlike [`.finally`](.) this is not called for rejections. ```js getUser().tap(function(user) { //Like in finally, if you return a promise from the handler //the promise is awaited for before passing the original value through return recordStatsAsync(); }).then(function(user) { //user is the user from getUser(), not recordStatsAsync() }); ``` Common case includes adding logging to an existing promise chain: ```js doSomething() .then(...) .then(...) .then(...) .then(...) ``` ```js doSomething() .then(...) .then(...) .tap(console.log) .then(...) .then(...) ``` *Note: in browsers it is necessary to call `.tap` with `console.log.bind(console)` because console methods can not be called as stand-alone functions.* </markdown></div> <div id="disqus_thread"></div> <script type="text/javascript"> var disqus_title = ".tap"; var disqus_shortname = "bluebirdjs"; var disqus_identifier = "disqus-id-tap"; (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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