複雑な配列グループ化JavaScript

このようなオブジェクトの配列があるとします-

const arr = [
   {userId: "3t5bsFB4PJmA3oTnm", from: 1, to: 6},
   {userId: "3t5bsFB4PJmA3oTnm", from: 7, to: 15},
   {userId: "3t5bsFB4PJmA3oTnm", from: 172, to: 181},
   {userId: "3t5bsFB4PJmA3oTnm", from: 182, to: 190}
];

そのような配列を1つ取り込むJavaScript関数を作成する必要があります。関数は、「from」プロパティと「to」プロパティに基づいて重複するオブジェクトを次のような単一のオブジェクトにグループ化する必要があります-

const output = [
   {userId: "3t5bsFB4PJmA3oTnm", from: 1, to: 15},
   {userId: "3t5bsFB4PJmA3oTnm", from: 172, to: 190}
];

例

const arr = [
   {userId: "3t5bsFB4PJmA3oTnm", from: 1, to: 6},
   {userId: "3t5bsFB4PJmA3oTnm", from: 7, to: 15},
   {userId: "3t5bsFB4PJmA3oTnm", from: 172, to: 181},
   {userId: "3t5bsFB4PJmA3oTnm", from: 182, to: 190}
];
const groupByDuration = (arr = []) => {
   const result = arr.reduce((acc, val) => {
      let last = acc[acc.length - 1] || {};
      if (last.userId === val.userId && last.to + 1 === val.from) {
         last.to = val.to; } else {
            acc.push({ userId: val.userId, from: val.from, to: val.to });
      }
      return acc;
   }, []);
   return result;
}
console.log(groupByDuration(arr));

出力

そして、コンソールの出力は-

[
   { userId: '3t5bsFB4PJmA3oTnm', from: 1, to: 15 },
   { userId: '3t5bsFB4PJmA3oTnm', from: 172, to: 190 }
]