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

Sorting JavaScript Objects by Key: An Updated Guide

JavaScript objects retain the order of their properties in the source code. However, this order may not always reflect the desired sorting arrangement. To address this, it's essential to understand how JavaScript handles object property iteration.

In modern JavaScript (ES6 ), object iteration methods follow a specific order:

1. Array indices are sorted numerically.
2. String keys are sorted in the order they were created.
3. Symbols are sorted in the order they were created.

This means that JavaScript objects are ordered by default, allowing you to modify the order of keys as needed.

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

1. Extract the object keys into an array using Object.keys(object).
2. Sort the key array alphabetically using sort().

3. Iterate over the sorted keys and create a new object using the reduce() method:

   • For each key, assign the value associated with that key in the original object.

For example:

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

const ordered = Object.keys(unordered)
  .sort()
  .reduce((obj, key) => {
    obj[key] = unordered[key];
    return obj;
  }, {});

This code will output an object with alphabetically sorted keys:

{
  'a': 'baz',
  'b': 'foo',
  'c': 'bar'
}

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