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id	title	challengeType	forumTopicId	dashedName
5a23c84252665b21eecc7edb	Largest int from concatenated ints	5	302298	largest-int-from-concatenated-ints

--description--

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.

--hints--

maxCombine should be a function.

assert(typeof maxCombine == 'function');

maxCombine([1, 3, 3, 4, 55]) should return a number.

assert(typeof maxCombine([1, 3, 3, 4, 55]) == 'number');

maxCombine([1, 3, 3, 4, 55]) should return 554331.

assert.equal(maxCombine([1, 3, 3, 4, 55]), 554331);

maxCombine([71, 45, 23, 4, 5]) should return 71545423.

assert.equal(maxCombine([71, 45, 23, 4, 5]), 71545423);

maxCombine([14, 43, 53, 114, 55]) should return 55534314114.

assert.equal(maxCombine([14, 43, 53, 114, 55]), 55534314114);

maxCombine([1, 34, 3, 98, 9, 76, 45, 4]) should return 998764543431.

assert.equal(maxCombine([1, 34, 3, 98, 9, 76, 45, 4]), 998764543431);

maxCombine([54, 546, 548, 60]) should return 6054854654.

assert.equal(maxCombine([54, 546, 548, 60]), 6054854654);

--seed--

--seed-contents--

function maxCombine(xs) {

}

--solutions--

function maxCombine(xs) {
  return parseInt(
    xs
      .sort(function(x, y) {
        var a = x.toString(),
          b = y.toString(),
          ab = parseInt(a + b),
          ba = parseInt(b + a);

        return ab > ba ? -1 : ab < ba ? 1 : 0;
      })
      .join(''),
    10
  );
}

1.6 KiB Raw Blame History