Object.fromEntries() ใน JavaScript แปลง Iterable เป็น Object

Object.fromEntries(iterable) แปลง Iterable ของ Key-Value Pairs (Array, Map) ให้เป็น Object (คู่ของ Object.entries())

ตัวอย่าง

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>Object.fromEntries</title>
  <style>
    body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; }
    .result, .sample { font-size: 20px; font-weight: 500; }
  </style>
</head>
<body>
  <h1>Object.fromEntries() Method</h1>
  <div class="sample"><pre>[[firstName,Rohan],[lastName,Sharma],[age,22]]</pre></div>
  <div style="color: green;" class="result">Object = <br></div>
  <button class="Btn">CLICK HERE</button>
  <h3> Click to convert array to object </h3>
  <script>
    let resEle = document.querySelector(".result");
    let sampleEle = document.querySelector(".sample");
    let arr = [['firstName','Rohan'],['lastName','Sharma'],['age',22]];
    document.querySelector(".Btn").addEventListener("click", () => {
      let obj = Object.fromEntries(arr);
      for (let i in obj) {
        resEle.innerHTML += 'Key = ' + i + ' : Value = ' + obj[i] + '<br>';
      }
    });
  </script>
</body>
</html>

คำอธิบาย

• Input: Iterable ของ [key, value] Pairs (Array of Arrays, Map, Generator)
• Output: Object { key: value }
• คู่ของ Object.entries(obj) → [[key,val],...]
• ใช้กับ Map: Object.fromEntries(myMap)
• Use Case: Transform Object → Entries → Filter/Map → fromEntries → Object ใหม่

ตัวอย่าง Transform

const obj = { a: 1, b: 2, c: 3 };
const filtered = Object.fromEntries(
  Object.entries(obj).filter(([k,v]) => v > 1)
); // { b: 2, c: 3 }

ผลลัพธ์

Key = firstName : Value = Rohan
Key = lastName : Value = Sharma
Key = age : Value = 22