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curriculum/challenges/english/10-coding-interview-prep/rosetta-code/hash-from-two-arrays.md

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+---
+title: Hash from two arrays
+id: 595671d4d2cdc305f0d5b36f
+challengeType: 5
+forumTopicId: 302283
+---
+
+## Description
+<section id='description'>
+Using two Arrays of equal length, create a Hash object where the elements from one array (the keys) are linked to the elements of the other (the values).
+<strong>Related task:</strong>
+<ul>
+  <li><a href="https://rosettacode.org/wiki/Associative arrays/Creation" title="Associative arrays/Creation" target="_blank">Associative arrays/Creation</a></li>
+</ul>
+</section>
+
+## Instructions
+<section id='instructions'>
+
+</section>
+
+## Tests
+<section id='tests'>
+
+```yml
+tests:
+  - text: <code>arrToObj</code> should be a function.
+    testString: assert(typeof arrToObj === 'function');
+  - text: '<code>arrToObj([1, 2, 3, 4, 5], ["a", "b", "c", "d", "e"])</code> should return <code>{ 1: "a", 2: "b", 3: "c", 4: "d", 5: "e" }</code>'
+    testString: assert.deepEqual(arrToObj(...testCases[0]), res[0]);
+  - text: '<code>arrToObj([1, 2, 3, 4, 5], ["a", "b", "c", "d"])</code> should return <code>{ 1: "a", 2: "b", 3: "c", 4: "d", 5: undefined }</code>'
+    testString: assert.deepEqual(arrToObj(...testCases[1]), res[1]);
+  - text: '<code>arrToObj([1, 2, 3], ["a", "b", "c", "d", "e"])</code> should return <code>{ 1: "a", 2: "b", 3: "c" }</code>'
+    testString: assert.deepEqual(arrToObj(...testCases[2]), res[2]);
+  - text: '<code>arrToObj(["a", "b", "c", "d", "e"], [1, 2, 3, 4, 5])</code> should return <code>{ "a": 1, "b": 2, "c": 3 , "d": 4, "e": 5 }</code>'
+    testString: assert.deepEqual(arrToObj(...testCases[3]), res[3]);
+  - text: '<code>arrToObj(["a", "b", "c", "d", "e"], [1, 2, 3, 4])</code> should return <code>{ "a": 1, "b": 2, "c": 3 , "d": 4, "e": undefined }</code>'
+    testString: assert.deepEqual(arrToObj(...testCases[4]), res[4]);
+  - text: '<code>arrToObj(["a", "b", "c"], [1, 2, 3, 4, 5])</code> should return <code>{ "a": 1, "b": 2, "c": 3  }</code>'
+    testString: assert.deepEqual(arrToObj(...testCases[5]), res[5]);
+
+```
+
+</section>
+
+## Challenge Seed
+<section id='challengeSeed'>
+
+<div id='js-seed'>
+
+```js
+function arrToObj (keys, vals) {
+
+  return true;
+}
+```
+
+</div>
+
+
+### After Test
+<div id='js-teardown'>
+
+```js
+const testCases = [
+  [[1, 2, 3, 4, 5], ['a', 'b', 'c', 'd', 'e']],
+  [[1, 2, 3, 4, 5], ['a', 'b', 'c', 'd']],
+  [[1, 2, 3], ['a', 'b', 'c', 'd', 'e']],
+  [['a', 'b', 'c', 'd', 'e'], [1, 2, 3, 4, 5]],
+  [['a', 'b', 'c', 'd', 'e'], [1, 2, 3, 4]],
+  [['a', 'b', 'c'], [1, 2, 3, 4, 5]]
+];
+
+const res = [
+  { 1: 'a', 2: 'b', 3: 'c', 4: 'd', 5: 'e' },
+  { 1: 'a', 2: 'b', 3: 'c', 4: 'd', 5: undefined },
+  { 1: 'a', 2: 'b', 3: 'c' },
+  { a: 1, b: 2, c: 3, d: 4, e: 5 },
+  { a: 1, b: 2, c: 3, d: 4, e: undefined },
+  { a: 1, b: 2, c: 3 }
+];
+```
+
+</div>
+
+</section>
+
+## Solution
+<section id='solution'>
+
+
+```js
+function arrToObj (keys, vals) {
+  return keys.reduce((map, key, index) => {
+    map[key] = vals[index];
+    return map;
+  }, {});
+}
+```
+
+</section>