Benchmark: Object.assign vs spread operator perf

Tests:

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

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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Let's break down the provided benchmark and explain what's being tested, compared, and analyzed.

**Benchmark Overview**

The benchmark compares the performance of two approaches for object assignment:

1. `Object.assign()`
2. The spread operator (`{ ...params, a: 2 }`)

**Test Cases**

There are two individual test cases:

1. **`Object.assign()`**: This test case creates an object `params` with properties `b`, `c`, and `d`, and then uses `Object.assign()` to merge this object with another object that adds property `a`.
2. **Spread Operator (`{ ...params, a: 2 }`)**: This test case does the same as the previous one but uses the spread operator to create a new object.

**Options Compared**

The benchmark compares the performance of these two approaches:

* `Object.assign()`: A built-in JavaScript method for merging objects.
* Spread Operator (`{ ...params, a: 2 }`): A syntax sugar that allows creating a new object by spreading an existing object and adding new properties.

**Pros and Cons**

Here's a brief summary of the pros and cons of each approach:

* `Object.assign()`:
	+ Pros:
		- Widely supported and well-documented.
		- Can handle nested objects.
	+ Cons:
		- May be slower due to its method call overhead.
		- Not as concise or readable as the spread operator.
* Spread Operator (`{ ...params, a: 2 }`):
	+ Pros:
		- Concise and readable syntax.
		- Can be faster since it avoids the method call overhead of `Object.assign()`.
	+ Cons:
		- May not work correctly with nested objects or complex merges.
		- Requires support for the spread operator, which was introduced in ECMAScript 2018.

**Library/Features Used**

There is no specific library used in this benchmark. However, it's worth noting that some JavaScript engines (like V8) have optimizations for the spread operator.

**Special JS Features/Syntax**

No special JS features or syntax are mentioned in this benchmark.

Related benchmarks:

Object.assign vs spread operator perf (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):