Benchmark: ok5}O.54<'fn9ZN2KFz0

Script Preparation code:

var getObject2 = () => Object.fromEntries(Array.from({
    length: 5000
}).map((_, i) => [i, Math.random()]))

var a = getObject2()
var getObject = () => a

Tests:

Object.values(obj)
var a = getObject(); let sum = 0; Object.values(a).forEach((v) => { sum += v });
for...in
var a = getObject(); let sum = 0; for (var key in a) { const v = a[key]; sum += v; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.values(obj)
for...in

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36

Browser/OS: Chrome 114 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Object.values(obj)	28315.2 Ops/sec
for...in	11153.2 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 benchmark and its test cases.

**Benchmark Definition Json**

The provided JSON defines a benchmark named "ok5}O.54<'fn9ZN2KFz0" with a description of "asd". It also includes two scripts that need to be executed:

1. `var getObject2 = () => Object.fromEntries(Array.from({\r\n    length: 5000\r\n}).map((_, i) => [i, Math.random()]))`
   - This script creates an object with 5000 properties, where each property has a random value.
   - The object is then assigned to the variable `a`.

2. `var getObject = () => a`

3. (No HTML preparation code provided)

**Individual Test Cases**

The benchmark consists of two test cases:

1. **Test Case 1: Object.values(obj)**
   - This script executes `var a = getObject();` followed by `let sum = 0;`
   - Then, it uses the `Object.values()` method to get an array of values from object `a` and sums them up using the `forEach()` method.
   - The test case is named "Object.values(obj)".

2. **Test Case 2: for...in**
   - This script executes `var a = getObject();` followed by `let sum = 0;`
   - Then, it uses the `for...in` loop to iterate over the properties of object `a`, adds each value to the sum.
   - The test case is named "for...in"

**Options Compared**

The two test cases compare the performance of `Object.values()` and `for...in` methods when iterating over an object.

**Pros and Cons of Each Approach**

1. **Object.values() Method**
   - Pros:
     - More modern and efficient method, which was introduced in ECMAScript 2019.
     - Does not require the use of the `for...in` loop or a loop variable.
   - Cons:
     - May have different performance characteristics depending on the browser.

2. **For...in Loop**
   - Pros:
     - More widely supported, as it has been around since ECMAScript 1999.
     - Can be useful in situations where you need to iterate over both the keys and values of an object.
   - Cons:
     - May have performance implications due to the use of a loop variable and potentially slow property iteration.

**Special Considerations**

- The benchmark uses some advanced JavaScript syntax, including arrow functions (`=>`), template literals (`` ``), and the `Object.fromEntries()` method. This may limit its accessibility to older browsers or those with limited JavaScript support.
- The benchmark also relies on ES2019+ features like the spread operator (`` `) in the `Object.fromEntries()` function.

**Other Alternatives**

1. **Using the `for...in` loop and an iterator**
   - This approach avoids some of the potential performance implications associated with using the modern `Object.values()` method.
   - However, it still requires manual management of a loop variable.

2. **Using other iteration methods (e.g., `for...of`, or `forEach() on an array)**
   - These alternatives might not be suitable for this specific scenario since they work on different data structures than objects.
   - They may offer better performance in some cases, but also depend heavily on the input and the context.

In conclusion, when comparing the two test cases, we can see that `Object.values()` is likely to be faster due to its modern implementation, but there are potential browser-specific differences. For older browsers or those with limited JavaScript support, using a more traditional approach like the `for...in` loop might offer better compatibility and performance characteristics

Related benchmarks:

ok5}O.54<'fn9ZN2KFz0 (version: 0)

asd

Comparing performance of: Object.values(obj) vs for...in

Created: one year ago by: Guest

Jump to the latest result

Object.values(obj)

for...in

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):