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+ <h1 class="page-title">waterfall.js</h1>
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+ <section>
+ <article>
+ <pre class="prettyprint source linenums"><code>import once from &apos;./internal/once&apos;;
+
+import onlyOnce from &apos;./internal/onlyOnce&apos;;
+import wrapAsync from &apos;./internal/wrapAsync&apos;;
+import awaitify from &apos;./internal/awaitify&apos;
+
+/**
+ * Runs the `tasks` array of functions in series, each passing their results to
+ * the next in the array. However, if any of the `tasks` pass an error to their
+ * own callback, the next function is not executed, and the main `callback` is
+ * immediately called with the error.
+ *
+ * @name waterfall
+ * @static
+ * @memberOf module:ControlFlow
+ * @method
+ * @category Control Flow
+ * @param {Array} tasks - An array of [async functions]{@link AsyncFunction}
+ * to run.
+ * Each function should complete with any number of `result` values.
+ * The `result` values will be passed as arguments, in order, to the next task.
+ * @param {Function} [callback] - An optional callback to run once all the
+ * functions have completed. This will be passed the results of the last task&apos;s
+ * callback. Invoked with (err, [results]).
+ * @returns undefined
+ * @example
+ *
+ * async.waterfall([
+ * function(callback) {
+ * callback(null, &apos;one&apos;, &apos;two&apos;);
+ * },
+ * function(arg1, arg2, callback) {
+ * // arg1 now equals &apos;one&apos; and arg2 now equals &apos;two&apos;
+ * callback(null, &apos;three&apos;);
+ * },
+ * function(arg1, callback) {
+ * // arg1 now equals &apos;three&apos;
+ * callback(null, &apos;done&apos;);
+ * }
+ * ], function (err, result) {
+ * // result now equals &apos;done&apos;
+ * });
+ *
+ * // Or, with named functions:
+ * async.waterfall([
+ * myFirstFunction,
+ * mySecondFunction,
+ * myLastFunction,
+ * ], function (err, result) {
+ * // result now equals &apos;done&apos;
+ * });
+ * function myFirstFunction(callback) {
+ * callback(null, &apos;one&apos;, &apos;two&apos;);
+ * }
+ * function mySecondFunction(arg1, arg2, callback) {
+ * // arg1 now equals &apos;one&apos; and arg2 now equals &apos;two&apos;
+ * callback(null, &apos;three&apos;);
+ * }
+ * function myLastFunction(arg1, callback) {
+ * // arg1 now equals &apos;three&apos;
+ * callback(null, &apos;done&apos;);
+ * }
+ */
+function waterfall (tasks, callback) {
+ callback = once(callback);
+ if (!Array.isArray(tasks)) return callback(new Error(&apos;First argument to waterfall must be an array of functions&apos;));
+ if (!tasks.length) return callback();
+ var taskIndex = 0;
+
+ function nextTask(args) {
+ var task = wrapAsync(tasks[taskIndex++]);
+ task(...args, onlyOnce(next));
+ }
+
+ function next(err, ...args) {
+ if (err === false) return
+ if (err || taskIndex === tasks.length) {
+ return callback(err, ...args);
+ }
+ nextTask(args);
+ }
+
+ nextTask([]);
+}
+
+export default awaitify(waterfall)
+</code></pre>
+ </article>
+ </section>
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