Benchmark: Object.assign vs spread operator2232

Tests:

Object.assign
var params = { b:"hello", c: true, d:7 }; var other = Object.assign({ a: 2 }, params);
spread operator
var params = { b:"hello", c: true, d:7 }; var other = { a: 2, ...params };
Manual Update
var params = { b:"hello", c: true, d:7 }; var newParams = {}; newParams.a = 2; newParams.b = "NEW TEXT"; newParams.c = params.c; newParams.d = params.d;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.assign
spread operator
Manual Update

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

I'll break down the benchmark and its test cases to explain what's being tested.

**Benchmark Overview**

The benchmark is designed to compare the performance of three approaches for creating an object:

1. `Object.assign()`
2. Spread operator (`...` syntax)
3. Manual update (creating a new object and updating its properties)

**Test Cases**

Each test case consists of a script that defines an object `params` with some properties, and then creates a new object using the specified approach.

Let's analyze each test case:

1. **Object.assign()**
The script creates an object `other` by calling `Object.assign()` with two arguments: an initial object `{ a: 2 }` and the `params` object.
```javascript
var params = { b:\"hello\", c: true, d:7 };
var other = Object.assign({ a: 2 }, params);
```
The test case is likely measuring the time it takes to execute this code.

**Pros and Cons**

* **Pros**: `Object.assign()` is a widely supported method for merging objects. It's simple and efficient.
* **Cons**: This approach can be slower than others because it creates a new object and then merges the properties using the spread operator (`...`).

2. **Spread Operator**
The script creates an object `other` by using the spread operator (`...`) to merge the properties of `{ a: 2 }` with `params`.
```javascript
var params = { b:\"hello\", c: true, d:7 };
var other = { a: 2, ...params };
```
The test case is likely measuring the time it takes to execute this code.

**Pros and Cons**

* **Pros**: The spread operator is concise and efficient. It creates a new object without modifying the original.
* **Cons**: This approach may not be as widely supported as `Object.assign()` in older browsers or versions of Node.js.

3. **Manual Update**
The script creates an empty object `newParams` and then updates its properties using the `params` object.
```javascript
var params = { b:\"hello\", c: true, d:7 };
var newParams = {};
newParams.a = 2;
newParams.b = "NEW TEXT";
newParams.c = params.c;
newParams.d = params.d;
```
The test case is likely measuring the time it takes to execute this code.

**Pros and Cons**

* **Pros**: This approach gives you full control over the object creation process. It's also concise.
* **Cons**: This approach can be slower than others because it creates an empty object and then updates its properties, which may trigger additional overhead (e.g., garbage collection).

**Library Used**

None of these test cases use any external libraries.

**Special JS Features or Syntax**

None of the test cases employ special JavaScript features or syntax beyond what's described above.

**Other Alternatives**

There are other ways to create an object in JavaScript, such as using `Object.create()`, method chaining (`{ ... }`), or even using a library like Lodash. However, these alternatives aren't being tested in this benchmark.

Overall, this benchmark aims to provide insight into the performance differences between three common approaches for creating objects in JavaScript: `Object.assign()`, spread operator, and manual update.

Related benchmarks:

Object.assign vs spread operator2232 (version: 0)

Comparing performance of: Object.assign vs spread operator vs Manual Update

Created: 3 years ago by: Guest

Jump to the latest result

Object.assign

spread operator

Manual Update

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):