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103 lines
2.0 KiB
Markdown
103 lines
2.0 KiB
Markdown
---
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id: a789b3483989747d63b0e427
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title: Return Largest Numbers in Arrays
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challengeType: 1
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forumTopicId: 16042
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dashedName: return-largest-numbers-in-arrays
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---
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# --description--
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Return an array consisting of the largest number from each provided sub-array. For simplicity, the provided array will contain exactly 4 sub-arrays.
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Remember, you can iterate through an array with a simple for loop, and access each member with array syntax `arr[i]`.
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# --hints--
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`largestOfFour([[4, 5, 1, 3], [13, 27, 18, 26], [32, 35, 37, 39], [1000, 1001, 857, 1]])` should return an array.
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```js
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assert.isArray(
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largestOfFour([
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[4, 5, 1, 3],
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[13, 27, 18, 26],
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[32, 35, 37, 39],
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[1000, 1001, 857, 1]
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])
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);
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```
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`largestOfFour([[13, 27, 18, 26], [4, 5, 1, 3], [32, 35, 37, 39], [1000, 1001, 857, 1]])` should return `[27, 5, 39, 1001]`.
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```js
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assert.deepEqual(
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largestOfFour([
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[13, 27, 18, 26],
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[4, 5, 1, 3],
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[32, 35, 37, 39],
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[1000, 1001, 857, 1]
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]),
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[27, 5, 39, 1001]
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);
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```
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`largestOfFour([[4, 9, 1, 3], [13, 35, 18, 26], [32, 35, 97, 39], [1000000, 1001, 857, 1]])` should return `[9, 35, 97, 1000000]`.
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```js
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assert.deepEqual(
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largestOfFour([
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[4, 9, 1, 3],
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[13, 35, 18, 26],
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[32, 35, 97, 39],
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[1000000, 1001, 857, 1]
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]),
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[9, 35, 97, 1000000]
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);
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```
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`largestOfFour([[17, 23, 25, 12], [25, 7, 34, 48], [4, -10, 18, 21], [-72, -3, -17, -10]])` should return `[25, 48, 21, -3]`.
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```js
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assert.deepEqual(
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largestOfFour([
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[17, 23, 25, 12],
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[25, 7, 34, 48],
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[4, -10, 18, 21],
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[-72, -3, -17, -10]
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]),
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[25, 48, 21, -3]
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);
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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 largestOfFour(arr) {
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return arr;
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}
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largestOfFour([
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[4, 5, 1, 3],
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[13, 27, 18, 26],
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[32, 35, 37, 39],
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[1000, 1001, 857, 1]
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]);
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```
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# --solutions--
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```js
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function largestOfFour(arr) {
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return arr.map(subArr => Math.max.apply(null, subArr));
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}
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largestOfFour([
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[4, 5, 1, 3],
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[13, 27, 18, 26],
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[32, 35, 37, 39],
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[1000, 1001, 857, 1]
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]);
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```
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