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77 lines
2.8 KiB
Markdown
77 lines
2.8 KiB
Markdown
---
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id: 69cfca90e8a0a6d4d6871c4e
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title: "Challenge 264: Anagram Groups"
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challengeType: 28
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dashedName: challenge-264
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---
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# --description--
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Given an array of words, return a 2d array of the words grouped into anagrams.
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- Words are anagrams if they contain the same letters in any order.
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- Each word belongs to exactly one group.
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- Return order doesn't matter.
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For example, given `["listen", "silent", "hello", "enlist", "world"]`, return `[["listen", "silent", "enlist"], ["hello"], ["world"]]`.
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# --hints--
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`groupAnagrams(["listen", "silent", "hello", "enlist", "world"])` should return `[["listen", "silent", "enlist"], ["hello"], ["world"]]`.
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```js
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const groups = groupAnagrams(["listen", "silent", "hello", "enlist", "world"]);
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const sorted = groups.map(g => g.sort()).sort((a, b) => a[0].localeCompare(b[0]));
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assert.deepEqual(sorted, [["enlist", "listen", "silent"], ["hello"], ["world"]]);
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```
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`groupAnagrams(["eat", "tea", "tan", "ate", "nat", "bat"])` should return `[["ate", "eat", "tea"], ["bat"], ["nat", "tan"]]`.
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```js
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const groups = groupAnagrams(["eat", "tea", "tan", "ate", "nat", "bat"]);
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const sorted = groups.map(g => g.sort()).sort((a, b) => a[0].localeCompare(b[0]));
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assert.deepEqual(sorted, [["ate", "eat", "tea"], ["bat"], ["nat", "tan"]]);
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```
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`groupAnagrams(["care", "race", "acre", "pots", "stop", "tops", "opts", "post", "spot", "evil", "vile", "live", "veil"])` should return `[["acre", "care", "race"], ["evil", "live", "veil", "vile"], ["opts", "post", "pots", "spot", "stop", "tops"]]`.
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```js
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const groups = groupAnagrams(["care", "race", "acre", "pots", "stop", "tops", "opts", "post", "spot", "evil", "vile", "live", "veil"]);
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const sorted = groups.map(g => g.sort()).sort((a, b) => a[0].localeCompare(b[0]));
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assert.deepEqual(sorted, [["acre", "care", "race"], ["evil", "live", "veil", "vile"], ["opts", "post", "pots", "spot", "stop", "tops"]]);
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```
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`groupAnagrams(["algorithms", "logarithms", "education", "cautioned", "auctioned", "triangle", "integral", "alerting", "relating"])` should return `[["alerting", "integral", "relating", "triangle"], ["algorithms", "logarithms"], ["auctioned", "cautioned", "education"]]`.
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```js
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const groups = groupAnagrams(["algorithms", "logarithms", "education", "cautioned", "auctioned", "triangle", "integral", "alerting", "relating"]);
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const sorted = groups.map(g => g.sort()).sort((a, b) => a[0].localeCompare(b[0]));
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assert.deepEqual(sorted, [["alerting", "integral", "relating", "triangle"], ["algorithms", "logarithms"], ["auctioned", "cautioned", "education"]]);
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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 groupAnagrams(words) {
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return words;
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}
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```
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# --solutions--
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```js
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function groupAnagrams(words) {
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const map = {};
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for (const word of words) {
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const key = word.split('').sort().join('');
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if (!map[key]) map[key] = [];
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map[key].push(word);
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}
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return Object.values(map);
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}
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```
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