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curriculum/challenges/english/10-coding-interview-prep/rosetta-code/stream-merge.md

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+---
+id: 5a23c84252665b21eecc802a
+title: Stream Merge
+challengeType: 5
+forumTopicId: 302326
+---
+
+## Description
+
+<section id='description'>
+
+Write a function that takes multiple sorted arrays of items, and returns one array of sorted items.
+
+</section>
+
+## Instructions
+
+<section id='instructions'>
+
+</section>
+
+## Tests
+
+<section id='tests'>
+
+```yml
+tests:
+  - text: <code>mergeLists</code> should be a function.
+    testString: assert(typeof mergeLists == 'function');
+  - text: <code>mergeLists([[1, 3, 5, 9, 10], [2, 4, 6, 7, 8]])</code> should return an array.
+    testString: assert(Array.isArray(mergeLists([[1, 3, 5, 9, 10], [2, 4, 6, 7, 8]])));
+  - text: <code>mergeLists([[1, 3, 5, 9, 10], [2, 4, 6, 7, 8]])</code> should return <code>[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]</code>.
+    testString: assert.deepEqual(mergeLists([[1, 3, 5, 9, 10], [2, 4, 6, 7, 8]]), [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
+  - text: <code>mergeLists([[1, 4, 7, 10], [2, 5, 8, 11], [3, 6, 9, 12]])</code> should return <code>[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]</code>.
+    testString: assert.deepEqual(mergeLists([[1, 4, 7, 10], [2, 5, 8, 11], [3, 6, 9, 12]]), [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]);
+  - text: <code>mergeLists([[1, 3, 9, 14, 15, 17, 28], [7, 8, 14, 14, 23, 26, 28, 29, 30], [9, 23, 25, 29]])</code> should return <code>[1, 3, 7, 8, 9, 9, 14, 14, 14, 15, 17, 23, 23, 25, 26, 28, 28, 29, 29, 30]</code>.
+    testString: assert.deepEqual(mergeLists([[1, 3, 9, 14, 15, 17, 28], [7, 8, 14, 14, 23, 26, 28, 29, 30], [9, 23, 25, 29]]), [1, 3, 7, 8, 9, 9, 14, 14, 14, 15, 17, 23, 23, 25, 26, 28, 28, 29, 29, 30]);
+  - text: <code>mergeLists([[3, 14, 15], [2, 17, 18], [], [2, 3, 5, 7]])</code> should return <code>[2, 2, 3, 3, 5, 7, 14, 15, 17, 18]</code>.
+    testString: assert.deepEqual(mergeLists([[3, 14, 15], [2, 17, 18], [], [2, 3, 5, 7]]), [2, 2, 3, 3, 5, 7, 14, 15, 17, 18]);
+  - text: <code>mergeLists([[1, 19, 1999], [17, 33, 2999, 3000], [8, 500, 3999]])</code> should return <code>[1, 8, 17, 19, 33, 500, 1999, 2999, 3000, 3999]</code>.
+    testString: assert.deepEqual(mergeLists([[1, 19, 1999], [17, 33, 2999, 3000], [8, 500, 3999]]), [1, 8, 17, 19, 33, 500, 1999, 2999, 3000, 3999]);
+```
+
+</section>
+
+## Challenge Seed
+
+<section id='challengeSeed'>
+
+<div id='js-seed'>
+
+```js
+function mergeLists(lists) {
+
+}
+```
+
+</div>
+</section>
+
+## Solution
+
+<section id='solution'>
+
+```js
+function mergeLists(lists) {
+  function merge(l1, l2) {
+    var result = [],
+      i = 0,
+      j = 0;
+    while (l1.length && l2.length) {
+      if (l1[i] <= l2[j]) {
+        result.push(l1.shift());
+      } else {
+        result.push(l2.shift());
+      }
+    }
+
+    result.push.apply(result, l1);
+    result.push.apply(result, l2);
+    return result;
+  }
+
+  var result = lists[0];
+  for (var i = 1; i < lists.length; i++) {
+    result = merge(result, lists[i]);
+  }
+
+  return result;
+}
+```
+
+</section>