Benchmark: 44Object.assign vs spread operator irekqq

Tests:

Object.assign
var params = { b:"hello", c: true, d:7 }; var other = Object.assign({ok: 4}, params);
spread operator
var params = { b:"hello", c: true, d:7 }; const obj = { ok: 4 }; var other = { obj, ...params };

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Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.assign
spread operator

Fastest: N/A

Slowest: N/A

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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 JSON and explain what's being tested.

**Benchmark Overview**

The benchmark compares two approaches to merge an object with another object: `Object.assign` and the spread operator (`...`).

**Options Compared**

1. **`Object.assign`**: This method takes multiple objects as arguments and merges them into a new object, overriding any existing properties.
2. **Spread Operator (`...`)**: This syntax allows you to create a new object by spreading an existing object's properties into it.

**Pros and Cons of Each Approach**

* `Object.assign`:
	+ Pros: Simple, widely supported, and easy to use.
	+ Cons: Can be slower than the spread operator due to the overhead of method calls and property lookups.
* Spread Operator (`...`):
	+ Pros: Fast, concise, and modern syntax.
	+ Cons: Not as widely supported (although gaining popularity) and may require explicit type definitions.

**Library/Functionality Used**

In this benchmark, `Object.assign` is a built-in JavaScript function. The spread operator (`...`) is a feature introduced in ECMAScript 2018 (ES2018).

**Special JS Feature/Syntax**

The spread operator (`...`) is the special syntax being compared here.

**Other Considerations**

* Performance: The spread operator is generally faster than `Object.assign` due to its ability to avoid method calls and property lookups.
* Readability: `Object.assign` can be less readable due to the use of a function call, while the spread operator is more concise and modern.
* Browser Support: While both approaches are supported by most modern browsers, the spread operator may not be as widely supported in older versions or non-standard browsers.

**Alternative Approaches**

For merging objects, other alternatives include:

1. `Object.assign` with object destructuring: `{ ...params }`
2. Function call with string interpolation: `Object.create(null).assign(params)`
3. Using a library like Lodash's `merge` function

However, the spread operator (`...`) is currently the most concise and efficient way to merge objects in modern JavaScript.

Related benchmarks:

44Object.assign vs spread operator irekqq (version: 0)

Comparing performance of: Object.assign vs spread operator

Created: 6 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):