Benchmark: _.isEqual vs Object.is

HTML Preparation code:

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.min.js"></script>

Script Preparation code:

window.obj = {};

for (var i = 0, len = 1000; i < len; i++) {
    obj['key' + i] = 'value' + i;
}

window.obj1 = {};

for (var j = 0, len = 1000; j < len; j++) {
    obj1['key' + j] = 'value' + j;
}

Tests:

_.isEqual
_.isEqual(window.obj, window.obj2);
Object.is()
Object.is(window.obj, window.obj2)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
_.isEqual
Object.is()

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/127.0.0.0 Safari/537.36 SberBrowser/19.0.0.0

Browser/OS: Chrome 127 on Windows

View result in a separate tab

Test name	Executions per second
_.isEqual	1564464.9 Ops/sec
Object.is()	1613596.6 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Let's break down the provided JSON data and explain what is being tested, the different options compared, their pros and cons, and other considerations.

**Benchmark Definition**

The benchmark definition consists of two test cases:

1. `_.isEqual(window.obj, window.obj2);`
2. `Object.is(window.obj, window.obj2)`

Both tests compare two objects, `window.obj` and `window.obj2`, which are populated with 1000 key-value pairs using nested loops.

**Script Preparation Code**

The script preparation code creates two objects:

* `window.obj`: an object with 1000 key-value pairs
* `window.obj1`: another object with 1000 key-value pairs, identical to `window.obj`

These objects are used as input for the benchmark tests.

**Html Preparation Code**

The HTML preparation code includes a script tag that loads the Lodash library (version 4.17.4) from a CDN. Lodash is a utility library that provides various helper functions, including _.isEqual.

**Options Compared**

Two options are being compared:

1. `_.isEqual(window.obj, window.obj2);`
2. `Object.is(window.obj, window.obj2)`

Both functions compare the two objects for equality. However, there are differences in their implementation and behavior:

* `_` (Lodash): _.isEqual is a specialized function that checks for deep object equality, including arrays and objects with nested structures. It also supports more advanced features like checking for equal values, properties, and even entire objects.
* `Object.is`: This is a built-in JavaScript function that compares two values for strict equality, including primitive types and objects. However, it does not support deep object comparisons.

**Pros and Cons**

Here are some pros and cons of each approach:

### _.isEqual (Lodash)

Pros:

* Deep object comparison
* Supports arrays and objects with nested structures
* Can check for equal values, properties, and entire objects

Cons:

* Adds additional overhead due to the Lodash library
* May not be as efficient as `Object.is` for simple comparisons

### Object.is

Pros:

* Built-in function, no additional overhead
* Fast and lightweight comparison

Cons:

* Does not support deep object comparisons
* Only compares primitive types and objects (no arrays or nested structures)

**Other Considerations**

* The use of Lodash adds a dependency on the library, which may not be desirable in all cases.
* `Object.is` is a built-in function, so it does not require additional overhead. However, it may not provide the same level of control as `_` (Lodash).

**Special JS Feature or Syntax**

There are no special JS features or syntax used in this benchmark.

**Library and Purpose**

The Lodash library provides various utility functions for JavaScript development. In this case, _.isEqual is a specialized function that checks for deep object equality.

**Alternatives**

If you need to compare objects without using Lodash, you can implement your own function similar to `_.isEqual`. Alternatively, you can use the built-in `Object.is` function for simple comparisons, but be aware of its limitations.

Related benchmarks:

_.isEqual vs Object.is (version: 0)

Comparing performance of: _.isEqual vs Object.is()

Created: 2 years ago by: Guest

Jump to the latest result

_.isEqual

Object.is()

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):