Benchmark: [MV] Object.keys() vs Object.values()

HTML Preparation code:

<!--your preparation HTML code goes here-->

Script Preparation code:

var obj = {
  'a': 'keyA',
  'b': 'keyB',
  'c': 'keyC',
  'd': 'keyD',
  'e': 'keyE',
  'f': 'keyF',
  'g': 'keyG',
};

Tests:

Object.keys()
for (var i=10000; i > 0; i--) { Object.keys(obj).forEach((key) => console.log(key)); }
Object.values()
for (var i=10000; i > 0; i--) { Object.values(obj).forEach((value) => console.log(value)); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.keys()
Object.values()

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 7 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/537.36

Browser/OS: Chrome 140 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Object.keys()	6.2 Ops/sec
Object.values()	6.3 Ops/sec

Autogenerated LLM Summary (model gpt-4o-mini, generated 7 months ago):

LLMs can make mistakes. Check important info.

The benchmark presented compares the performance of two JavaScript methods, `Object.keys()` and `Object.values()`, when iterating over an object with predefined keys and values. Both methods serve different purposes, and the benchmark evaluates their execution speed in a controlled environment using a loop that runs 10,000 iterations.

### What is Tested

1. **Object.keys()**:
   - **Purpose**: This method returns an array of a given object's own enumerable property names, iterated in the same order that a normal loop would.
   - **Benchmark Code**: The test iterates over the result of `Object.keys()` for the given object `obj` and logs each key to the console.

2. **Object.values()**:
   - **Purpose**: This method returns an array of a given object's own enumerable property values, in the same order as the keys returned by `Object.keys()`.
   - **Benchmark Code**: The test iterates over the result of `Object.values()` and logs each value to the console.

### Performance Results

From the benchmark results:

- **Object.values()**: 6.339 executions per second
- **Object.keys()**: 6.211 executions per second

This indicates that `Object.values()` performed slightly faster than `Object.keys()` in this specific case.

### Pros and Cons of Each Approach

- **Object.keys()**:
  - **Pros**: 
    - Useful when you need to access property names directly.
    - Allows for operations where the names of the properties are required.
  - **Cons**:
    - In this test, it showed a lower execution rate compared to `Object.values()`.
  
- **Object.values()**:
  - **Pros**: 
    - Provides a direct way to access the values, which could be more useful depending on the context of use.
    - Typically, in scenarios where values are more frequently needed than keys, this method is preferred.
  - **Cons**:
    - Not useful when property names are needed for further operations.

### Other Considerations

1. **Overall Performance**: Though one method may be faster than the other in a specific benchmark, the overall performance may be influenced by various factors such as the environment (technical specs, browser optimizations) and intended use.

2. **Readability and Intent**: Select the method based on the intention of your code. If you are more interested in keys for iteration, use `Object.keys()`. If you are focused on values, use `Object.values()`. Maintaining code clarity and intent is essential for maintainability.

3. **Alternative Methods**:
   - **Object.entries()**: This method returns an array of a given object's own enumerable string-keyed property [key, value] pairs. It is useful for situations where both keys and values are needed simultaneously.

4. **Environment Considerations**: The performance can vary significantly between different browsers and environments. Therefore, it's often a good practice to test benchmarks across various platforms to get a holistic view of performance characteristics.

### Final Remarks

In practice, the choice between `Object.keys()` and `Object.values()` should be dictated by the requirements of your application. The benchmark indicates `Object.values()` might execute slightly faster in this scenario, but real-world applications might have different performance characteristics based on their context and usage patterns.

Related benchmarks:

[MV] Object.keys() vs Object.values() (version: 1)

Comparing performance of: Object.keys() vs Object.values()

Created: 7 months ago by: Guest

Jump to the latest result

Object.keys()

Object.values()

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gpt-4o-mini, generated 7 months ago):