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Edit: call.md
--- layout: api id: call title: .call --- [← Back To API Reference](/docs/api-reference.html) <div class="api-code-section"><markdown> ##.call ```js .call( String methodName, [any args...] ) ``` This is a convenience method for doing: ```js promise.then(function(obj) { return obj[methodName].call(obj, arg...); }); ``` For example ([`some` is a built-in array method](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Array/some)): ```js var Promise = require("bluebird"); var fs = Promise.promisifyAll(require("fs")); var path = require("path"); var thisPath = process.argv[2] || "."; var now = Date.now(); fs.readdirAsync(thisPath) .map(function(fileName) { return fs.statAsync(path.join(thisPath, fileName)); }) .call("some", function(stat) { return (now - new Date(stat.mtime)) < 10000; }) .then(function(someFilesHaveBeenModifiedLessThanTenSecondsAgo) { console.log(someFilesHaveBeenModifiedLessThanTenSecondsAgo) ; }); ``` Chaining lo-dash or underscore methods (Copy-pasteable example): ```js var Promise = require("bluebird"); var pmap = Promise.map; var props = Promise.props; var _ = require("lodash"); var fs = Promise.promisifyAll(require("fs")); function getTotalSize(paths) { return pmap(paths, function(path) { return fs.statAsync(path).get("size"); }).reduce(function(a, b) { return a + b; }, 0); } fs.readdirAsync(".").then(_) .call("groupBy", function(fileName) { return fileName.charAt(0); }) .call("map", function(fileNames, firstCh) { return props({ firstCh: firstCh, count: fileNames.length, totalSize: getTotalSize(fileNames) }); }) // Since the currently wrapped array contains promises we need to unwrap it and call .all() before continuing the chain // If the currently wrapped thing was an object with properties that might be promises, we would call .props() instead .call("value").all().then(_) .call("sortBy", "count") .call("reverse") .call("map", function(data) { return data.count + " total files beginning with " + data.firstCh + " with total size of " + data.totalSize + " bytes"; }) .call("join", "\n") .then(console.log) ``` </markdown></div> <div id="disqus_thread"></div> <script type="text/javascript"> var disqus_title = ".call"; var disqus_shortname = "bluebirdjs"; var disqus_identifier = "disqus-id-call"; (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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