- 482 名前：デフォルトの名無しさん [2019/09/17(火) 21:47:22.78 ID:s7WBnLNZ.net]
- >>467 JavaScript
const f = s => [...s]
.reduce((acc, ch) => {
const [lastCh, n = 1] = acc.pop() || [];
if (!lastCh) return [[ch]];
if (lastCh == ch) {
return [...acc, [lastCh, n + 1]];
} else {
return [...acc, [lastCh, n == 1 ? '' : n], [ch]];
}
}, [])
.flat(Infinity)
.join``;
