Array Destructuring ใน JavaScript แยกค่าจาก Array

Destructuring Assignment แยกค่าจาก Array/Object ให้ตัวแปรหลายตัวในบรรทัดเดียว

ตัวอย่าง

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>Array Destructuring</title>
  <style>
    body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; }
    .result, .sample { font-size: 20px; font-weight: 500; }
  </style>
</head>
<body>
  <h1>Array Destructuring in JavaScript</h1>
  <div class="sample"></div>
  <div style="color: green;" class="result"></div>
  <button class="Btn">CLICK HERE</button>
  <h3> Click to destructure the array </h3>
  <script>
    let sampleEle = document.querySelector(".sample");
    let resEle = document.querySelector(".result");
    let arr = ["F", "G", 22, 44];
    sampleEle.innerHTML = "arr = " + arr;
    let a, b, c, d;
    document.querySelector(".Btn").addEventListener("click", () => {
      [a, b, c, d] = arr;
      resEle.innerHTML = "After destructuring:<br>";
      resEle.innerHTML += `a=${a} b=${b} c=${c} d=${d}`;
    });
  </script>
</body>
</html>

คำอธิบาย

Basic

const [a, b, c] = [1, 2, 3]; // a=1, b=2, c=3

Skip Values

const [a, , c] = [1, 2, 3]; // a=1, c=3 (ข้าม b)

Default Values

const [a = 10, b = 20] = [1]; // a=1, b=20

Rest Pattern

const [first, ...rest] = [1,2,3,4]; // first=1, rest=[2,3,4]

Swap Variables

[a, b] = [b, a]; // สลับค่าโดยไม่ต้อง Temp Variable

ผลลัพธ์

a=F b=G c=22 d=44