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<div class="content" data-ice="content"><h1 data-ice="title">lib/iterator.js</h1>
<pre class="source-code line-number raw-source-code"><code class="prettyprint linenums" data-ice="content">/**
 * Creates an iterator function which calls the next function in the `tasks`
 * array, returning a continuation to call the next one after that. It&apos;s also
 * possible to &#x201C;peek&#x201D; at the next iterator with `iterator.next()`.
 *
 * This function is used internally by the `async` module, but can be useful
 * when you want to manually control the flow of functions in series.
 *
 * @name iterator
 * @static
 * @memberOf async
 * @category Control Flow
 * @param {Array} tasks - An array of functions to run.
 * @returns The next function to run in the series.
 * @example
 *
 * var iterator = async.iterator([
 *     function() { sys.p(&apos;one&apos;); },
 *     function() { sys.p(&apos;two&apos;); },
 *     function() { sys.p(&apos;three&apos;); }
 * ]);
 *
 * node&gt; var iterator2 = iterator();
 * &apos;one&apos;
 * node&gt; var iterator3 = iterator2();
 * &apos;two&apos;
 * node&gt; iterator3();
 * &apos;three&apos;
 * node&gt; var nextfn = iterator2.next();
 * node&gt; nextfn();
 * &apos;three&apos;
 */
export default function(tasks) {
    function makeCallback(index) {
        function fn() {
            if (tasks.length) {
                tasks[index].apply(null, arguments);
            }
            return fn.next();
        }
        fn.next = function() {
            return (index &lt; tasks.length - 1) ? makeCallback(index + 1) : null;
        };
        return fn;
    }
    return makeCallback(0);
}
</code></pre>

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