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69 lines
1.2 KiB
Markdown
69 lines
1.2 KiB
Markdown
---
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id: 691b559495c5cb5a37b9b481
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title: "Challenge 121: Most Frequent"
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challengeType: 28
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dashedName: challenge-121
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---
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# --description--
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Given an array of elements, return the element that appears most frequently.
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- There will always be a single most frequent element.
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# --hints--
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`mostFrequent(["a", "b", "a", "c"])` should return `"a"`.
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```js
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assert.equal(mostFrequent(["a", "b", "a", "c"]), "a");
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```
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`mostFrequent([2, 3, 5, 2, 6, 3, 2, 7, 2, 9])` should return `2`.
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```js
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assert.equal(mostFrequent([2, 3, 5, 2, 6, 3, 2, 7, 2, 9]), 2);
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```
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`mostFrequent([true, false, "false", "true", false])` should return `false`.
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```js
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assert.isFalse(mostFrequent([true, false, "false", "true", false]));
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```
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`mostFrequent([40, 20, 70, 30, 10, 40, 10, 50, 40, 60])` should return `40`.
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```js
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assert.equal(mostFrequent([40, 20, 70, 30, 10, 40, 10, 50, 40, 60]), 40);
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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 mostFrequent(arr) {
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return arr;
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}
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```
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# --solutions--
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```js
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function mostFrequent(arr) {
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const freq = {};
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let maxCount = 0;
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let mostElem = null;
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for (const el of arr) {
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freq[el] = (freq[el] || 0) + 1;
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if (freq[el] > maxCount) {
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maxCount = freq[el];
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mostElem = el;
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}
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}
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return mostElem;
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}
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```
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