Next highest int from digits: Difference between revisions
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Permutation count: Actual = 10, Expected = 10, OK = true
</pre>
=={{header|JavaScript}}==
<lang javascript>const compose = (...fn) => (...x) => fn.reduce((a, b) => c => a(b(c)))(...x);
const toString = x => x + '';
const reverse = x => Array.from(x).reduce((p, c) => [c, ...p], []);
const minBiggerThanN = (arr, n) => arr.filter(e => e > n).sort()[0];
const remEl = (arr, e) => {
const r = arr.indexOf(e);
return arr.filter((e,i) => i !== r);
}
const nextHighest = itr => {
const seen = [];
let result = 0;
for (const [i,v] of itr.entries()) {
const n = +v;
if (Math.max(n, ...seen) !== n) {
const right = itr.slice(i + 1);
const swap = minBiggerThanN(seen, n);
const rem = remEl(seen, swap);
const rest = [n, ...rem].sort();
result = [...reverse(right), swap, ...rest].join('');
break;
} else {
seen.push(n);
}
}
return result;
};
const check = compose(nextHighest, reverse, toString);
const test = v => {
console.log(v, '=>', check(v));
}
test(0);
test(9);
test(12);
test(21);
test(12453);
test(738440);
test(45072010);
test(95322020);
test('9589776899767587796600');
</lang>
{{out}}
<pre>0 => 0
9 => 0
12 => 21
21 => 0
12453 => 12534
738440 => 740348
45072010 => 45072100
95322020 => 95322200
9589776899767587796600 => 9589776899767587900667</pre>
=={{header|Julia}}==
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