Benchmark: Object.assign vs spread operator - no jquery

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 };

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

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

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I'll break down the benchmark and explain what's being tested, compared, and the pros and cons of each approach.

**Benchmark Overview**

The benchmark is comparing two JavaScript methods for merging objects: `Object.assign()` and the spread operator (`...`). The goal is to measure which method performs better in terms of speed and execution time.

**Options Compared**

Two options are being compared:

1. **`Object.assign()`**: This method takes multiple arguments, including an optional object to be merged into, and returns a new object with the properties from all arguments.
2. **Spread Operator (`...`)**: This operator is used to expand an object into individual arguments for a function call or other context.

**Pros and Cons of Each Approach**

1. **`Object.assign()`**:
	* Pros:
		+ Wide browser support
		+ Can be used with any type of object (not just objects)
		+ Allows for dynamic merging of objects
	* Cons:
		+ Can be slower due to the need to iterate over properties and create a new object
		+ Has a higher memory footprint due to the creation of a new object
2. **Spread Operator (`...`)**:
	* Pros:
		+ Faster execution time due to the ability to directly copy properties from one object to another
		+ Lower memory footprint since no new object is created
	* Cons:
		+ Only supported in modern browsers (IE 11 and later) and Node.js
		+ Can be less intuitive for some developers, especially those without experience with JavaScript

**Library Used**

None of the benchmark definitions use any external libraries. The `Object.assign()` method is a built-in JavaScript method, while the spread operator is also a native JavaScript feature.

**Special JS Feature or Syntax**

The benchmark tests both modern and older browsers using different methods to invoke the code. Notably, the `...` spread operator is only tested in Chrome 67 (a relatively recent version), while `Object.assign()` is tested in an unspecified browser, likely a modern one.

**Other Considerations**

When choosing between `Object.assign()` and the spread operator, consider the following factors:

* Browser support: If you need to support older browsers, use `Object.assign()`. For modern browsers, the spread operator might be a better choice.
* Memory efficiency: If memory usage is critical, use the spread operator, as it creates fewer objects than `Object.assign()`.
* Code readability and maintainability: Some developers may prefer the more concise syntax of the spread operator.

**Alternatives**

Other alternatives to compare when merging objects include:

1. **`JSON.parse(JSON.stringify(obj))`**: This method can be used for deep object merges, but it has a higher memory footprint than `Object.assign()` or the spread operator.
2. **Custom implementation**: Some developers might choose to implement their own custom merge function using loops and conditional statements.

Keep in mind that these alternatives may have different trade-offs in terms of performance, memory usage, and code readability.

Related benchmarks:

Object.assign vs spread operator - no jquery (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):