🔥 2-Step Guide to Efficient Data Grouping with JavaScript

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2 Simple Steps for Efficient Data Grouping Using JavaScript's Object.groupBy()

We're diving into the Object.groupBy()—a sleek and powerful tool for grouping data in JavaScript. Whether you're cruising the latest ES2023 features or crafting a polyfill for retro compatibility, this guide will help you master array organization like a boss. Ready to group?

Step 1: Using Object.groupBy()

With Object.groupBy(), you pass in an array and a callback function. The method groups array elements into an object, where keys are derived from the callback's return value.

Let’s group a list of items by their category:

const items = [
  { name: 'Apple', category: 'Fruit' },
  { name: 'Carrot', category: 'Vegetable' },
  { name: 'Banana', category: 'Fruit' },
  { name: 'Broccoli', category: 'Vegetable' },
];

const groupedItems = Object.groupBy(items, item => item.category);

console.log(groupedItems);

Step 2: Implementing a Polyfill for Older Environments

If you’re working in an environment that doesn’t support Object.groupBy(), here’s how to implement a similar feature manually.

We’ll use Array.reduce() to build the grouped object.

function groupBy(array, callback) {
  return array.reduce((result, item) => {
    const key = callback(item);
    if (!result[key]) {
      result[key] = [];
    }
    result[key].push(item);
    return result;
  }, {});
}

// Example usage:
const groupedData = groupBy(items, item => item.category);

console.log(groupedData);

Output (same for both steps):

{
  Fruit: [
    { name: 'Apple', category: 'Fruit' },
    { name: 'Banana', category: 'Fruit' }
  ],
  Vegetable: [
    { name: 'Carrot', category: 'Vegetable' },
    { name: 'Broccoli', category: 'Vegetable' }
  ]
}

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