Reduce.js

//2️⃣ Reduce

const seconds = timeNodes
        .map((node) => node.dataset.time)
        .reduce((acc, time) => {
          const [mins, secs] = time.split(":").map(parseFloat);
          time = mins * 60 + secs;
          return acc + time;
        }, 0);
      
      // 2️⃣ Reduce => 숫자(누적 계산 값) 반환
      // console.log(seconds); // 17938