Benchmark: Update data from Object (Spread vs. Object.assign) 12312879

Tests:

Update Object with Object.assign
const imutableObject = { name: 'David Walsh', age: 33, role: "Developer", status: "active", isLoading: true, isLoading1: true, isLoading2: true, isLoading3: true, isLoading4: true, isLoading5: true, isLoading6: true, isLoading7: true }; const newObject = Object.assign(imutableObject, {status: "inactive"});
Update Object with Spread Operator
const imutableObject = { name: 'David Walsh', age: 33, role: "Developer", status: "active", isLoading: true, isLoading1: true, isLoading2: true, isLoading3: true, isLoading4: true, isLoading5: true, isLoading6: true, isLoading7: true }; const newObject = {...imutableObject, status: "inactive"};

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Update Object with Object.assign
Update Object with 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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Let's break down the provided benchmark definition and test cases.

**What is tested:**

The benchmark measures the performance difference between using `Object.assign()` and the spread operator (`...`) when updating an object in JavaScript.

**Options compared:**

Two options are compared:

1. **`Object.assign()`**: This method creates a new object by copying all enumerable own properties from one or more source objects into a new object.
2. **Spread operator (`...`)**: This syntax is used to create a new object by spreading the properties of an existing object.

**Pros and cons of each approach:**

**`Object.assign()`**:

Pros:

* Wide browser support, as it's been part of the ECMAScript standard since 2015.
* Can handle nested objects and arrays with ease.

Cons:

* May be slower than the spread operator for simple updates, due to the overhead of creating a new object.
* Requires more memory allocations, as a new object is created for each update.

**Spread operator (`...`)**:

Pros:

* Generally faster than `Object.assign()` for simple updates, as it only creates a shallow copy of the object.
* More concise and readable code.

Cons:

* May not work as expected when dealing with nested objects or arrays.
* Not as widely supported by older browsers.

**Other considerations:**

Both approaches have their trade-offs in terms of performance, memory usage, and readability. The choice between `Object.assign()` and the spread operator ultimately depends on the specific use case and personal preference.

**Library used:**

None is explicitly mentioned in the benchmark definition, but it's likely that a JavaScript library or framework (e.g., React) might be involved in the test cases.

**Special JS feature/syntax:**

The use of the spread operator (`...`) is a relatively recent feature in JavaScript, introduced in ECMAScript 2015. This syntax allows for more concise and readable code, making it a popular choice for modern web development.

**Other alternatives:**

Other approaches to updating objects include:

1. **`Object.prototype.slice()`**: This method creates a shallow copy of an object using the `slice()` method.
2. **`Array.prototype.push()`**: This method can be used to update an object by pushing new properties onto it, but this approach is less efficient and may lead to performance issues.

Keep in mind that these alternatives are not as widely supported or recommended as `Object.assign()` or the spread operator for most use cases.

Related benchmarks:

Update data from Object (Spread vs. Object.assign) 12312879 (version: 0)

Comparing performance of: Update Object with Object.assign vs Update Object with Spread Operator

Created: 6 years ago by: Guest

Jump to the latest result

Update Object with Object.assign

Update Object with 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):