Benchmark: Lodash isEqual vs spread test

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.4/lodash.min.js"></script>

Script Preparation code:

// 1 level deep
window.foo1 = { a: 1, b: 2, c: { a: 1, b: 2, c: { a: 1, b: 2 } } };
window.bar1 = { a: 1, b: 3, c: { a: 1, b: 2, c: { a: 1, b: 2 } } };

for (let i = 0; i < 100; i++) {
  window.foo1[i] = "meow"
  window.bar1[i] = "meow"
}

// 2 levels deep
window.foo2 = { a: 1, b: 2, c: { a: 1, b: 2, c: { a: 1, b: 2 } } };
window.bar2 = { a: 1, b: 2, c: { a: 1, b: 3, c: { a: 1, b: 2 } } };

// 3 levels deep
window.foo3 = { a: 1, b: 2, c: { a: 1, b: 2, c: { a: 1, b: 2 } } };
window.bar3 = { a: 1, b: 2, c: { a: 1, b: 2, c: { a: 1, b: 4 } } };

Tests:

_.isEqual Level 1
_.isEqual(window.foo1, window.bar1)
spread
const a ={...window.foo1}
assign
const b = Object.assign({}, window.foo1)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
_.isEqual Level 1
spread
assign

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

LLMs can make mistakes. Check important info.

Let's break down what's being tested in this benchmark.

**Benchmark Definition**

The test measures the performance of Lodash's `isEqual` function, specifically when compared to two different approaches: using the spread operator (`...`) and `Object.assign()`.

**Options Compared**

1. **Lodash `isEqual`**: The official implementation from Lodash.
2. **Spread Operator (`...`)**: This is a syntax feature in modern JavaScript that allows creating a new object by taking all key-value pairs from an existing object.
3. **`Object.assign()`**: A built-in method in JavaScript that copies properties from one or more source objects to a target object.

**Pros and Cons**

* **Lodash `isEqual`**: Pros: highly optimized, widely used, and well-tested. Cons: may not be as performant as other approaches, especially for large datasets.
* **Spread Operator (`...`)**: Pros: concise, easy to read, and relatively fast. Cons: only supported in modern browsers and Node.js environments; can lead to unexpected behavior if not used carefully.
* **`Object.assign()`**: Pros: widely supported across all JavaScript environments, including older versions of Internet Explorer. Cons: can be slower than the spread operator and Lodash's `isEqual` for large datasets.

**Library**

Lodash is a popular utility library that provides various functional programming helpers, including `isEqual`, which is used in this benchmark to compare two objects for equality.

**Special JS Feature or Syntax**

The spread operator (`...`) is a relatively new syntax feature introduced in ECMAScript 2018 (ES2018). It's used to create a new object by taking all key-value pairs from an existing object. This feature is supported in modern browsers and Node.js environments, but may not work in older environments.

**Benchmark Preparation Code**

The preparation code creates three objects with increasing depth (`foo1`, `foo2`, and `foo3`) and fills them with some test data. These objects are then used to create the benchmark test cases.

**Other Alternatives**

If you want to measure performance, you could also consider using other approaches:

* Using a deep cloning library like Lodash's own `cloneDeep` or a third-party library like Immutable.js.
* Implementing your own custom equality check function.
* Measuring the performance of other JavaScript libraries or frameworks that provide similar functionality.

Related benchmarks:

Lodash isEqual vs spread test (version: 0)

Test on isEqual performance and spread

Comparing performance of: _.isEqual Level 1 vs spread vs assign

Created: 3 years ago by: Guest

Jump to the latest result

_.isEqual Level 1

spread

assign

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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