Benchmark: values, for in, keys for

Script Preparation code:

var a = {};

for (let i = 0; i++; i < 1000) {
	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) for (var j; j++; j < a.length) { var key = keys[j]; t.push(a[key]); }

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:

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and its test cases.

**Benchmark Definition JSON**

The benchmark definition represents three different JavaScript approaches to access properties of an object:

1. `values`: Uses `Object.values()` method to iterate over the object's property values.
2. `for in`: Uses a traditional `for` loop with `in` operator to iterate over the object's property names and then accesses their corresponding values using square bracket notation (`a[key]`).
3. `keys for`: Similar to `for in`, but uses `Object.keys()` method to get an array of property names, and then iterates over that array using a traditional `for` loop.

**Script Preparation Code**

The script preparation code creates an object `a` with 1000 properties, where each property is an object with three properties: `tid`, `prop1`, and `prop2`. The purpose of this setup is to provide a large dataset for the benchmark tests to measure performance.

**Html Preparation Code**

There is no HTML preparation code provided, which means that the benchmark only measures the JavaScript execution time.

**Library Usage**

The benchmark uses the following libraries:

* None explicitly mentioned, but it's likely that `Object.values()` and `Object.keys()` are part of the ECMAScript standard library.

**Special JS Features/Syntax**

None mentioned in this benchmark. However, it's worth noting that if the benchmark were to test performance of other JavaScript features or syntax, such as async/await, generators, or let/catch blocks, these would be mentioned.

**Pros and Cons of Different Approaches**

Here are some general pros and cons of each approach:

* `values`:
	+ Pros: Simple, efficient, and fast, especially for iterating over a large array of values.
	+ Cons: Can lead to slower performance if the object has many properties due to the overhead of creating an iterator object.
* `for in`:
	+ Pros: Allows direct access to property names and values using square bracket notation.
	+ Cons: Can be slower than other approaches, especially for large datasets, since it involves iterating over the property names and then accessing their corresponding values.
* `keys for`:
	+ Pros: Similar to `for in`, but uses an array of property names, which can lead to faster performance.
	+ Cons: Requires the use of `Object.keys()` method, which may not be as efficient as other approaches.

**Other Alternatives**

If you wanted to test different JavaScript approaches or features, here are some alternatives:

* For iterating over arrays:
	+ Using `forEach()`, `map()`, or `reduce()`
* For performing array operations:
	+ Using `filter()`, `sort()`, or `every()`
* For working with objects and their properties:
	+ Using `Object.assign()`, `Object.create()`, or `Object.prototype.hasOwnProperty()`

Related benchmarks:

values, for in, keys for (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):