Benchmark: Object.keys vs Object.values

Script Preparation code:

var obj = {};

for (let i = 0; i < 1000; i++) {
  obj['abc_' + i] = i;
}

Tests:

Object.keys
Object.keys(obj);
Object.values
Object.values(obj);

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: 5 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/141.0.0.0 Safari/537.36

Browser/OS: Chrome 141 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Object.keys	86796.1 Ops/sec
Object.values	25802.4 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks!

The provided JSON represents a benchmark test case that compares the performance of `Object.keys()` and `Object.values()` in JavaScript. Here's what we need to understand:

**Benchmark Definition:**
The benchmark definition specifies two test cases: "Object.keys" and "Object.values". These methods are part of the JavaScript Object Protocol (JP) and are used to retrieve an array of strings representing the property names or values of an object, respectively.

**Options Compared:**

1. **Object.keys()**: This method returns an array of strings that represent the property names of a given object.
2. **Object.values():** This method returns an array of values of a given object.

Pros and Cons:

*   **Object.keys()**: Pros:
    *   More explicit control over which properties are returned (only property names).
    *   Can be more efficient for large objects since it doesn't require accessing the object's prototype chain.
*   **Object.values():** Pros:
    *   Returns all values in an object, including inherited ones.
    *   Can be faster than `Object.keys()` if the majority of properties are values and not property names.

Cons:

*   **Object.keys()**: Cons:
    *   May include empty strings or null as property names.
*   **Object.values():** Cons:
    *   Returns all values in an object, including inherited ones. This may lead to slower performance for very large objects or those with many nested properties.

Other Considerations:

*   **Library Usage:** There is no library usage mentioned in the benchmark definition or test cases provided.
*   **Special JS Features/Syntax:** The benchmark does not use any special JavaScript features or syntax that would affect its execution.

To further compare these methods, you might want to consider adding additional test cases that cover other aspects, such as:

*   Iterating over object properties using `for...in` or `Object.entries()`.
*   Accessing an object's property names using `Object.getOwnPropertyNames()` or `Object.getOwnPropertySymbols()`.
*   Using iterators or generators with objects.

**Alternatives:**

Other alternatives to compare the performance of `Object.keys()` and `Object.values()` might include:

1.  **Iterating over object properties**: Using a loop, such as `for...in` or `Object.entries()`, to access an object's property names.
2.  **Accessing object properties using other methods**: Utilizing `Object.getOwnPropertyNames()`, `Object.getOwnPropertySymbols()`, `Object.keys()` with `Symbol.keys()`, or `Object.values()` with `Symbol.values()` for different types of properties.
3.  **Using iterators or generators**: Creating an iterator function that iterates over an object's property names using `for...in` or `Object.entries()`.
4.  **Accessing objects in a specific context**: Considering how the methods perform when accessing objects within different contexts, such as nested objects or objects with prototype chains.

These alternatives can provide additional insights into the performance characteristics of `Object.keys()` and `Object.values()`, helping you make informed decisions about which method to use depending on your specific requirements.

Related benchmarks:

Object.keys vs Object.values (version: 0)

Comparing performance of: Object.keys vs Object.values

Created: 7 years ago by: Registered User

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 llama3.2:3b, generated one year ago):