Benchmark: Object.assign vs spread operator large objects

Tests:

Object.assign
var params = { b:"hello", c: true, d:7, e: 'e', f: 'f', g: 'g', h: 'h', i: 1, j: 2, k: 3, l: 7, m: 7, n: 3, o: 'o', p: "azazazazazazazazaz", q: 'qqqqqqq' }; var other = Object.assign({ a: 2, aa: 2, aaa: 3, aaaa: 'aaaa' }, params);
spread operator
var params = { b:"hello", c: true, d:7, e: 'e', f: 'f', g: 'g', h: 'h', i: 1, j: 2, k: 3, l: 7, m: 7, n: 3, o: 'o', p: "azazazazazazazazaz", q: 'qqqqqqq' }; var other = { a: 2, aa: 2, aaa: 3, aaaa: 'aaaa', ...params };

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.assign
spread operator

Fastest: N/A

Slowest: N/A

Latest run results:

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

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**Overview of the Benchmark**

The provided benchmark measures the performance difference between using `Object.assign()` and the spread operator (`...`) when assigning large objects to a new variable in JavaScript.

**Benchmark Definition JSON**

The benchmark definition json contains two test cases:

1. "Object.assign"
2. "spread operator"

Each test case has a unique script preparation code that defines a large object `params` with various properties, including strings, numbers, booleans, and other data types.
3. The first test case uses the `Object.assign()` method to assign the `params` object to another object `other`. 
4. The second test case uses the spread operator (`...`) to create a new object by spreading the `params` object's properties.

**Options Compared**

The benchmark compares two options:

1. **Object.assign()**: A widely used method for assigning objects in JavaScript.
2. **Spread Operator (`...`)**: A newer, more concise way of creating objects by spreading existing objects' properties.

**Pros and Cons of Each Approach**

**Object.assign():**

Pros:

* Wide support across browsers and versions
* Can handle nested objects and arrays

Cons:

* Can be slower due to the overhead of function calls
* May not work as expected when dealing with non-object values (e.g., numbers, strings)

**Spread Operator (`...`):**

Pros:

* Faster execution time compared to `Object.assign()`
* More concise and readable code
* Works well with non-object values

Cons:

* Not supported in older browsers or versions
* May not work as expected when dealing with complex object structures

**Library Used: None**

There are no libraries used in this benchmark.

**Special JS Feature/Syntax: None**

This benchmark does not use any special JavaScript features or syntax, such as async/await, ES6 classes, or generators.

**Other Alternatives**

If you need to compare the performance of other assignment methods, consider these alternatives:

* **Destructuring Assignment**: Similar to the spread operator, but for objects instead of arrays.
* **Array.prototype.slice() or Array.prototype.concat()**: For assigning entire arrays instead of objects.

Keep in mind that these alternatives might not be as suitable for this specific benchmark, which focuses on object assignment.

Related benchmarks:

Object.assign vs spread operator large objects (version: 0)

Comparing performance of: Object.assign vs spread operator

Created: 7 years ago by: Guest

Jump to the latest result

Object.assign

spread operator

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):