Benchmark: Object.values(obj) vs for...in

Script Preparation code:

function extractValues(obj) {
   const result = [];
   for(var key in obj) { result.push(obj[key]); }
   return result;
}

Tests:

Object.values(obj)
var a = { a: 1, b: 2, c: 3}; Object.values(a);
for...in
var a = { a: 1, b: 2, c: 3}; extractValues(a);

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:

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Autogenerated LLM Summary (model gemma2:9b, generated one year ago):

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This benchmark compares two methods for extracting values from an object in JavaScript:  `Object.values()` and a traditional `for...in` loop.

**Options Compared:**

* **`Object.values(obj)`**: This is a built-in JavaScript method that directly returns an array containing all the values of an object. It's concise and efficient.
* **`for...in` loop**: This is a classic way to iterate over the properties of an object in JavaScript.  It involves manually pushing each value from the object into an array.

**Pros/Cons:**

| Method          | Pros                                     | Cons                                       |
|-----------------|-------------------------------------------|----------------------------------------------|
| `Object.values()` | * **Concise and readable:** One line of code does the job.<br>* **Potentially faster:** Often optimized by the JavaScript engine. | *  **Less versatile:** Doesn't allow you to access property names along with values. |
| `for...in` loop  | * **More control:** You can access both property names and values during iteration. | * **Verbose:** Requires more lines of code.<br>* **Potential for performance issues:** Less optimized than built-in methods in some cases.

**Other Considerations:**

* **Object Size:** For very large objects, the difference in performance between these methods might become more noticeable.
* **Use Case:** If you only need the values and don't require property names, `Object.values()` is the clear winner. If you need both values and names,  `for...in` provides that flexibility.

**Alternatives:**

* **`Object.entries(obj)`**: This method returns an array of key-value pairs from the object. It offers a balance between conciseness and control.

Let me know if you have any other questions about this benchmark or JavaScript benchmarking in general!

Related benchmarks:

Object.values(obj) vs for...in (version: 0)

Object.values(obj) function vs using a for...in loop.

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

Created: 6 years ago by: Guest

Jump to the latest result

Object.values(obj)

for...in

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model gemma2:9b, generated one year ago):