99 lines
3.1 KiB
Markdown
99 lines
3.1 KiB
Markdown
---
|
||
title: Hash from two arrays
|
||
id: 595671d4d2cdc305f0d5b36f
|
||
challengeType: 5
|
||
forumTopicId: 302283
|
||
localeTitle: Хэш из двух массивов
|
||
---
|
||
|
||
## Description
|
||
<section id='description'>
|
||
Задача: <p> Используя два массива равной длины, создайте объект Hash, в котором элементы из одного массива (ключи) связаны с элементами другого (значения) </p> Связанная задача: <a href="http://rosettacode.org/wiki/Associative arrays/Creation" title="Ассоциативные массивы / Создание">Ассоциативные массивы / Создание</a>
|
||
</section>
|
||
|
||
## Instructions
|
||
<section id='instructions'>
|
||
|
||
</section>
|
||
|
||
## Tests
|
||
<section id='tests'>
|
||
|
||
```yml
|
||
tests:
|
||
- text: <code>arrToObj</code> is 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) {
|
||
// Good luck!
|
||
return true;
|
||
}
|
||
|
||
```
|
||
|
||
</div>
|
||
|
||
### After Tests
|
||
<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>
|