use directories for structure

node_modules/now-and-later/lib/mapSeries.js

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+'use strict';
+
+var once = require('once');
+
+var helpers = require('./helpers');
+
+function mapSeries(values, iterator, extensions, done) {
+  // Allow for extensions to not be specified
+  if (typeof extensions === 'function') {
+    done = extensions;
+    extensions = {};
+  }
+
+  // Handle no callback case
+  if (typeof done !== 'function') {
+    done = helpers.noop;
+  }
+
+  done = once(done);
+
+  // Will throw if non-object
+  var keys = Object.keys(values);
+  var length = keys.length;
+  var idx = 0;
+  // Return the same type as passed in
+  var results = helpers.initializeResults(values);
+
+  var exts = helpers.defaultExtensions(extensions);
+
+  if (length === 0) {
+    return done(null, results);
+  }
+
+  var key = keys[idx];
+  next(key);
+
+  function next(key) {
+    var value = values[key];
+
+    var storage = exts.create(value, key) || {};
+
+    exts.before(storage);
+    iterator(value, key, once(handler));
+
+    function handler(err, result) {
+      if (err) {
+        exts.error(err, storage);
+        return done(err, results);
+      }
+
+      exts.after(result, storage);
+      results[key] = result;
+
+      if (++idx >= length) {
+        done(err, results);
+      } else {
+        next(keys[idx]);
+      }
+    }
+  }
+}
+
+module.exports = mapSeries;