Benchmark: Object spread - MeasureThat.net

Tests:

Object add new item
const firstObject = { sampleData: 'Hello world' } firstObject["moreData"] = "foo bar"
Object Spread
let firstObject = { sampleData: 'Hello world' } firstObject = { ...firstObject, moreData: 'foo bar' };

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object add new item
Object Spread

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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**What is being tested?**

The provided JSON represents two benchmark test cases: "Object add new item" and "Object Spread". These tests measure the performance difference between two approaches to add a new property to an object in JavaScript.

**Approaches compared:**

1. **Method 1: Object literal syntax with bracket notation**
```javascript
const firstObject = { sampleData: 'Hello world' };
firstObject['moreData'] = 'foo bar';
```
2. **Method 2: Spread operator (`...`) for object assignment**
```javascript
let firstObject = { sampleData: 'Hello world' };
firstObject = { ...firstObject, moreData: 'foo bar' };
```

**Pros and Cons of each approach:**

1. **Method 1 (Bracket notation):**
	* Pros:
		+ Widely supported across browsers and platforms.
		+ Easy to read and write.
	* Cons:
		+ Can lead to slower performance due to the need to look up the property name as a string.
2. **Method 2 (Spread operator):**
	* Pros:
		+ More concise and expressive.
		+ Can be faster since it avoids looking up property names.
	* Cons:
		+ Less widely supported, particularly in older browsers.
		+ May require additional compilation or transpilation to work.

**Other considerations:**

* The `Object.add` method is not used in the provided test cases. It was a common practice in older JavaScript versions (before ES6) but has been deprecated since then.
* There is no mention of the "library" or any specific syntax features that may be specific to certain browsers or platforms.

**Benchmark result:**

The latest benchmark results show that:

1. **Method 1 (Bracket notation)**: Chrome 70 on Linux Desktop achieved approximately 943 million executions per second.
2. **Method 2 (Spread operator)**: The same configuration, but with the spread operator, achieved around 34 million executions per second.

This suggests that the spread operator approach is significantly faster than the bracket notation approach in this specific benchmark.

**Alternatives:**

Other approaches to add a new property to an object might include:

* Using `Object.assign()` or `Object.create()`
* Utilizing object literals with destructuring (`{ ...firstObject, moreData }`)
* Employing template literals (`{ ...firstObject, ${moreData} = 'foo bar' }`)

However, the spread operator approach is currently the most efficient and widely adopted method in modern JavaScript.

Related benchmarks:

Object spread (version: 0)

test object

Comparing performance of: Object add new item vs Object Spread

Created: 7 years ago by: Guest

Jump to the latest result

Object add new item

Object Spread

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):