<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>
var arr = [{a: 1}, {b: 2}, {c: 3}];
_.merge({}, arr);
Object.assign({}, arr)
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
Lodash merge | |
Object assign |
Test name | Executions per second |
---|---|
Lodash merge | 1454548.4 Ops/sec |
Object assign | 3943043.2 Ops/sec |
I'll break down the provided benchmark and explain what's being tested, compared, and the pros/cons of each approach.
Benchmark Overview
The benchmark measures the performance difference between two approaches to merge an array of objects into a single object:
_.merge()
: A popular JavaScript utility library that provides functions for common tasks, including merging objects.Object.assign()
: A built-in JavaScript method for cloning and merging objects.Test Cases
There are only two test cases in this benchmark:
_.merge()
): This test case uses the _.merge()
function from Lodash to merge an array of objects into a single object.Object.assign()
): This test case uses the built-in Object.assign()
method to achieve the same result as the Lodash _.merge()
function.Library and Syntax
The benchmark includes the Lodash library, which is a JavaScript utility library that provides functions for common tasks, including merging objects. The _.merge()
function is used in one of the test cases.
No special JavaScript features or syntax are mentioned in this benchmark.
Performance Comparison
The performance comparison aims to measure which approach is faster:
_.merge()
) vs Object assign (Object.assign()
)Pros and Cons
Here's a brief summary of each approach:
_.merge()
):Object.assign()
)_.merge()
function.Other Alternatives
If you don't want to use the Lodash library or prefer a different approach, you could consider:
reduce()
method: You can use the reduce()
method to merge an array of objects into a single object. This approach is lightweight and doesn't require any additional libraries.arr.reduce((acc, curr) => Object.assign(acc, curr), {});
Keep in mind that these alternatives may not offer the same level of performance as Lodash's _.merge()
function or the built-in Object.assign()
method.