JavaScript 模式匹配：用于健壮代码的结构化数据解构

            const obj = { a: 1, b: 2, c: 3 };
const { a, b } = obj; // a = 1, b = 2

            

              
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            const { a: newA, b: newB } = obj; // newA = 1, newB = 2

            

              
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            const obj = { a: 1 };
const { a, b = 5 } = obj; // a = 1, b = 5 (default value)

            

              
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            const obj = { a: 1, b: { c: 2, d: 3 } };
const { b: { c, d } } = obj; // c = 2, d = 3

            

              
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            const obj = { a: 1, b: 2, c: 3 };
const { a, ...rest } = obj; // a = 1, rest = { b: 2, c: 3 }

            

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

            

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

            

              
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            const arr = [1];
const [a, b = 5] = arr; // a = 1, b = 5

            

              
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            const arr = [1, 2, 3, 4];
const [a, b, ...rest] = arr; // a = 1, b = 2, rest = [3, 4]

            

              
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            function greet({ name, age }) {
  console.log(`Hello, ${name}! You are ${age} years old.`);
}

const person = { name: 'Alice', age: 30 };
greet(person); // Output: Hello, Alice! You are 30 years old.

            

              
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            import { useState, useEffect } from 'react';

            

              
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            async function fetchData() {
  const response = await fetch('https://api.example.com/users/1');
  const { id, name, email } = await response.json();
  console.log(`User ID: ${id}, Name: ${name}, Email: ${email}`);
}

            

              
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            let a = 1;
let b = 2;
[a, b] = [b, a]; // a = 2, b = 1

            

              
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            function getCoordinates() {
  return [10, 20];
}

const [x, y] = getCoordinates(); // x = 10, y = 20

            

              
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            const translations = {
  en: {
    greeting: "Hello",
    farewell: "Goodbye"
  },
  fr: {
    greeting: "Bonjour",
    farewell: "Au revoir"
  }
};

function greetIn(locale) {
  const { greeting } = translations[locale];
  console.log(`${greeting}!`);
}

greetIn('fr'); // Output: Bonjour!

            

              
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            const config = {
  apiUrl: "https://api.example.com",
  timeout: 5000,
  maxRetries: 3
};

function makeApiRequest({ apiUrl, timeout }) {
  console.log(`Making request to ${apiUrl} with timeout ${timeout}`);
}

makeApiRequest(config);

            

              
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