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85 lines
1.9 KiB
Markdown
85 lines
1.9 KiB
Markdown
---
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id: a105e963526e7de52b219be9
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title: Sorted Union
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challengeType: 1
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forumTopicId: 16077
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dashedName: sorted-union
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---
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# --description--
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Write a function that takes two or more arrays and returns a new array of unique values in the order of the original provided arrays.
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In other words, all values present from all arrays should be included in their original order, but with no duplicates in the final array.
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The unique numbers should be sorted by their original order, but the final array should not be sorted in numerical order.
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Check the assertion tests for examples.
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# --hints--
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`uniteUnique([1, 3, 2], [5, 2, 1, 4], [2, 1])` should return `[1, 3, 2, 5, 4]`.
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```js
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assert.deepEqual(uniteUnique([1, 3, 2], [5, 2, 1, 4], [2, 1]), [1, 3, 2, 5, 4]);
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```
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`uniteUnique([1, 2, 3], [5, 2, 1])` should return `[1, 2, 3, 5]`.
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```js
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assert.deepEqual(uniteUnique([1, 2, 3], [5, 2, 1]), [1, 2, 3, 5]);
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```
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`uniteUnique([1, 2, 3], [5, 2, 1, 4], [2, 1], [6, 7, 8])` should return `[1, 2, 3, 5, 4, 6, 7, 8]`.
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```js
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assert.deepEqual(uniteUnique([1, 2, 3], [5, 2, 1, 4], [2, 1], [6, 7, 8]), [
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1,
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2,
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3,
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5,
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4,
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6,
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7,
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8
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]);
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```
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`uniteUnique([1, 3, 2], [5, 4], [5, 6])` should return `[1, 3, 2, 5, 4, 6]`.
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```js
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assert.deepEqual(uniteUnique([1, 3, 2], [5, 4], [5, 6]), [1, 3, 2, 5, 4, 6]);
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```
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`uniteUnique([1, 3, 2, 3], [5, 2, 1, 4], [2, 1])` should return `[1, 3, 2, 5, 4]`.
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```js
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assert.deepEqual(uniteUnique([1, 3, 2, 3], [5, 2, 1, 4], [2, 1]), [1, 3, 2, 5, 4]);
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```
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# --seed--
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## --seed-contents--
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```js
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function uniteUnique(arr) {
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return arr;
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}
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uniteUnique([1, 3, 2], [5, 2, 1, 4], [2, 1]);
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```
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# --solutions--
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```js
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function uniteUnique(arr) {
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return [].slice.call(arguments).reduce(function(a, b) {
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return [].concat(
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a,
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b.filter(function(e, currentIndex) {
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return b.indexOf(e) === currentIndex && a.indexOf(e) === -1;
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}));
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}, []);
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}
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```
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