78 lines
2.6 KiB
Markdown
78 lines
2.6 KiB
Markdown
---
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id: 5a23c84252665b21eecc7edb
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title: Largest int from concatenated ints
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challengeType: 5
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forumTopicId: 302298
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---
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## Description
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<section id='description'>
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Given a set of positive integers, write a function to order the integers in such a way that the concatenation of the numbers forms the largest possible integer and return this integer.
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</section>
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## Instructions
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<section id='instructions'>
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</section>
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## Tests
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<section id='tests'>
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``` yml
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tests:
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- text: <code>maxCombine</code> should be a function.
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testString: assert(typeof maxCombine == 'function', '<code>maxCombine</code> should be a function.');
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- text: <code>maxCombine([1, 3, 3, 4, 55])</code> should return a number.
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testString: assert(typeof maxCombine([1, 3, 3, 4, 55]) == 'number', '<code>maxCombine([1, 3, 3, 4, 55])</code> should return a number.');
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- text: <code>maxCombine([1, 3, 3, 4, 55])</code> should return <code>554331</code>.
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testString: assert.equal(maxCombine([1, 3, 3, 4, 55]), 554331, '<code>maxCombine([1, 3, 3, 4, 55])</code> should return <code>554331</code>.');
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- text: <code>maxCombine([71, 45, 23, 4, 5])</code> should return <code>71545423</code>.
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testString: assert.equal(maxCombine([71, 45, 23, 4, 5]), 71545423, '<code>maxCombine([71, 45, 23, 4, 5])</code> should return <code>71545423</code>.');
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- text: <code>maxCombine([14, 43, 53, 114, 55])</code> should return <code>55534314114</code>.
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testString: assert.equal(maxCombine([14, 43, 53, 114, 55]), 55534314114, '<code>maxCombine([14, 43, 53, 114, 55])</code> should return <code>55534314114</code>.');
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- text: <code>maxCombine([1, 34, 3, 98, 9, 76, 45, 4])</code> should return <code>998764543431</code>.
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testString: assert.equal(maxCombine([1, 34, 3, 98, 9, 76, 45, 4]), 998764543431, '<code>maxCombine([1, 34, 3, 98, 9, 76, 45, 4])</code> should return <code>998764543431</code>.');
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- text: <code>maxCombine([54, 546, 548, 60])</code> should return <code>6054854654</code>.
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testString: assert.equal(maxCombine([54, 546, 548, 60]), 6054854654, '<code>maxCombine([54, 546, 548, 60])</code> should return <code>6054854654</code>.');
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='js-seed'>
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```js
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function maxCombine(xs) {
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// Good luck!
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}
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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function maxCombine (xs) {
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return parseInt(
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xs.sort(
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function (x, y) {
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var a = x.toString(),
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b = y.toString(),
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ab = parseInt(a + b),
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ba = parseInt(b + a);
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return ab > ba ? -1 : (ab < ba ? 1 : 0);
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}
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)
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.join(''), 10
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);
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}
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```
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</section>
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