おう
// 再帰関数
function getPermutations(str) {
if (str.length <= 1) return [str];
let results = [];
for (let i = 0; i < str.length; i++) {
let char = str[i];
let remaining = str.slice(0, i) + str.slice(i + 1);
for (let p of getPermutations(remaining)) {
results.push(char + p);
}
}
return results;
}
// JSでのフィルタ例
const results = getPermutations("ビートたけし");
const invalid = ["ー", "っ", "ゃ", "ゅ", "ょ"];
// 先頭文字がinvalidに含まれないものだけ抽出
const filtered = results.filter(name => !invalid.includes(name[0]));
console.log(filtered.join("\n"));