How Can I Sort a JavaScript Object's Keys Alphabetically?

Ordering JavaScript Objects by Key: A Comprehensive Guide

In JavaScript, objects are powerful data structures, but their keys are initially unordered. For instances where sorted keys are essential, sorting JavaScript objects becomes necessary.

Object Key Ordering in ES6 and Beyond

Contrary to previous beliefs, JavaScript objects are now ordered in ES6 and later versions. The property iteration order follows a specific pattern:

1. Array indices (sorted numerically)
2. String keys (ordered by creation)
3. Symbols (ordered by creation)

Sorting Objects by Key Alphabetically

To sort an object by its keys alphabetically, you can employ the following steps:

1. Extract Object Keys: Extract all object keys into an array using Object.keys().
2. Sort Keys: Sort the array of keys alphabetically.
3. Recreate Object: Iterate over the sorted keys and recreate the object with the sorted key order.

Here's a code snippet demonstrating this process:

const unordered = {
  b: 'foo',
  c: 'bar',
  a: 'baz',
};

// Sort keys
const sortedKeys = Object.keys(unordered).sort();

// Recreate ordered object
const ordered = sortedKeys.reduce((obj, key) => {
  obj[key] = unordered[key];
  return obj;
}, {});

console.log(ordered); // { a: 'baz', b: 'foo', c: 'bar' }

Note: This approach preserves the original object's data and does not mutate it.

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