Benchmark: last values test

Script Preparation code:

var a = {};

for (let i = 0; i < 1000; i++) {
	var key = 'adjaksdnmas'+i;	
  	a[key] = {
    	id: key,
      	prop1: true,
      	pro2: 'asdäöasdlas',
     	prop3: [1, 23, 42342, 523423]
    };
}

Tests:

values
var t = Object.values(a)
for in
var t = []; for (var key in a) { t.push(a[key]); }
keys for
var t = []; var keys = Object.keys(a) var length = keys.length; for (var j; j < length; j++) { t.push(a[keys[j]]); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
values
for in
keys for

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark and its options.

**Benchmark Definition:**

The benchmark is designed to measure the performance of three different ways to iterate over an object's values: `Object.values()`, `for...in` loop, and using `Object.keys()` to get the keys and then iterating over them.

**Options Compared:**

1. **`Object.values()`**: This method returns an array of a given object's own enumerable property values.
2. **`for...in` loop**: This is a traditional way to iterate over an object's properties, but it also includes non-enumerable properties and can be slower due to the overhead of iterating over all properties, even if they're not being used.
3. **Using `Object.keys()` to get keys and then iterating**: This approach involves getting the keys of the object using `Object.keys()`, and then iterating over them to access their corresponding values.

**Pros and Cons:**

* **`Object.values()`**:
	+ Pros: Fast, efficient, and modern way to get an array of values.
	+ Cons: Requires ECMAScript 2019 (ES10) or later for compatibility with older browsers.
* **`for...in` loop**:
	+ Pros: Wide browser support, as it's been around since ES5.
	+ Cons: Can be slower due to the overhead of iterating over all properties, even if they're not being used. Also includes non-enumerable properties.
* **Using `Object.keys()` and then iterating**:
	+ Pros: Still fast and widely supported, but may have slightly higher overhead than `Object.values()` due to the additional step of getting keys.
	+ Cons: May require more memory since we're storing the keys in an array.

**Library Used:**

None. The benchmark is self-contained and doesn't rely on any external libraries for its functionality.

**Special JS Features/Syntax:**

* None mentioned. All three approaches use standard JavaScript syntax.

**Other Considerations:**

When choosing between these approaches, consider the following:

* If you need to support older browsers (e.g., IE 11), the `for...in` loop might be a safer choice.
* If you're targeting modern browsers and want a fast, efficient way to iterate over an object's values, `Object.values()` is likely your best bet.

**Alternative Approaches:**

Some other ways to iterate over an object's values could include:

* Using `for...of` loop (introduced in ES6) with the `[Symbol.iterator]()` method.
* Utilizing a library like Lodash or Ramda, which provide utility functions for working with objects and arrays.

These alternative approaches might offer different trade-offs in terms of performance, memory usage, and compatibility across browsers.

Related benchmarks:

last values test (version: 0)

Comparing performance of: values vs for in vs keys for

Created: 3 years ago by: Guest

Jump to the latest result

values

for in

keys for

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):