Benchmark: pepepe - MeasureThat.net

Tests:

primero
const obj = { name: 'pepe', age: 24 }; const secondObj = { ...obj, otraPropiedad: true };
segundo
"use strict"; function ownKeys(object, enumerableOnly) { var keys = Object.keys(object); if (Object.getOwnPropertySymbols) { var symbols = Object.getOwnPropertySymbols(object); if (enumerableOnly) symbols = symbols.filter(function (sym) { return Object.getOwnPropertyDescriptor(object, sym).enumerable; }); keys.push.apply(keys, symbols); } return keys; } function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; if (i % 2) { ownKeys(Object(source), true).forEach(function (key) { _defineProperty(target, key, source[key]); }); } else if (Object.getOwnPropertyDescriptors) { Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)); } else { ownKeys(Object(source)).forEach(function (key) { Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key)); }); } } return target; } function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; } var obj = { name: 'pepe', age: 24 }; var secondObj = _objectSpread(_objectSpread({}, obj), {}, { otraPropiedad: true });

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
primero
segundo

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.102 Safari/537.36

Browser/OS: Chrome 85 on Linux

View result in a separate tab

Test name	Executions per second
primero	1136431.6 Ops/sec
segundo	178672.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested, compared options, pros and cons, and other considerations.

**Benchmark Definition**

The benchmark definition is empty, meaning that no custom script preparation code or HTML preparation code is required. This suggests that the focus of the benchmark is on the JavaScript execution itself.

**Individual Test Cases**

There are two test cases:

1. "primero" (first)
2. "segundo" (second)

Both test cases involve creating an object with properties `name` and `age`, and then creating a new object by spreading the first object using `_objectSpread`. The second test case also adds an additional property `otraPropiedad`.

**What's being tested?**

The primary goal of these benchmarks is to compare the performance of different approaches for creating objects in JavaScript. Specifically:

* Creating an object with properties using bracket notation (`obj = { name: 'pepe', age: 24 };`)
* Using spread operators to create a new object from an existing one (`secondObj = _objectSpread(obj, {}, { otraPropiedad: true });`)

**Comparison of options**

There are two main approaches being compared:

1. **Bracket notation**: `const obj = { name: 'pepe', age: 24 }; const secondObj = { ...obj };`
2. **Spread operators**: `const obj = { name: 'pepe', age: 24 }; const secondObj = _objectSpread(obj, {}, { otraPropiedad: true });`

**Pros and Cons of each approach**

1. **Bracket notation**
	* Pros:
		+ More readable and intuitive
		+ Less error-prone (no syntax errors when using spread operators)
	* Cons:
		+ May be slower due to the need to iterate over object properties
2. **Spread operators**
	* Pros:
		+ Faster, as it avoids iterating over object properties
		+ More concise and expressive
	* Cons:
		+ May have syntax errors or unexpected behavior if not used carefully

**Other considerations**

The use of `_objectSpread` suggests that the benchmark is interested in the performance differences between using spread operators versus bracket notation. The `ownKeys` function and `_defineProperty` are also being tested, which implies that the benchmark wants to compare the overhead of these functions.

**Library usage**

The library used here is ES6 (ECMAScript 2015) syntax features, specifically:

* Spread operators (`{ ...obj }`)
* `_objectSpread` function
* `ownKeys` and `_defineProperty` functions

These libraries are built into modern JavaScript engines and are not specific to MeasureThat.net.

**Special JS feature or syntax**

The benchmark uses the "use strict" directive at the top of the test cases. This is a valid JavaScript syntax that can affect performance, but it's not typically a significant consideration for microbenchmarks like this one.

Overall, these benchmarks aim to compare the performance of different approaches for creating objects in JavaScript, with a focus on spread operators versus bracket notation.

Related benchmarks:

pepepe (version: 0)

pepe

Comparing performance of: primero vs segundo

Created: 4 years ago by: Guest

Jump to the latest result

primero

segundo

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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