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Run results for: lodash groupBy vs Object.groupBy 500k

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Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36
Chrome 130
Mac OS X 10.15.7
Desktop
6 months ago
Test name Executions per second
Lodash with _.mapValues and _.omit 2.8 Ops/sec
Native reduce Grouping with Destructuring 14.5 Ops/sec
Custom reduce with Object.keys Filtering 8.4 Ops/sec
Lodash Grouping with Native Key Removal 44.2 Ops/sec
HTML Preparation code:
AخA
 
1
<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
Script Preparation code:
​x
 
const max2 = 500000;
var rows = [];
​
for (let i = 0; i <= max2; i++) {  // Use `let` for `i` as it’s updated in each loop iteration
  rows.push({
    id: i,
    task_id: i % 1000,
    name: `Task ${i}`,
    status: i % 2 === 0 ? 'active' : 'inactive',
    description: `Description for task ${i}`,
    priority: Math.floor(Math.random() * 5) + 1
  });
}
​
Tests:

  • Lodash with _.mapValues and _.omit

     
    const lodashMapValuesOmitGrouped = _.mapValues(_.groupBy(rows, 'task_id'), group =>
      group.map(row => _.omit(row, 'task_id'))
    );
    ​

  • Native reduce Grouping with Destructuring

     
    const nativeReduceGrouped = rows.reduce((acc, row) => {
        const { task_id, ...rest } = row;  // Exclude `task_id` using destructuring
        if (!acc[task_id]) acc[task_id] = [];  // Initialize array for this `task_id`
        acc[task_id].push(rest);  // Add the item without `task_id` to the group
        return acc;
    }, {});
    ​

  • Custom reduce with Object.keys Filtering

     
    const customReduceGrouped = rows.reduce((acc, row) => {
        if (!acc[row.id]) acc[row.id] = []; // Initialize an array for each unique id
        const rowData = Object.keys(row).reduce((obj, key) => {
            if (key !== 'id') obj[key] = row[key]; // Exclude 'id' to avoid nesting
            return obj;
        }, {});
        acc[row.id].push(rowData);
        return acc;
    }, {});
    ​

  • Lodash Grouping with Native Key Removal

     
    const lodashGroupedWithDelete = _.groupBy(rows, 'task_id');
    ​
    Object.values(lodashGroupedWithDelete).forEach(group => {
      group.forEach(item => {
        delete item.task_id;  // Remove `task_id` directly from each item
      });
    });
    ​