Benchmark: Object.values vs for

Tests:

Object.values
const o = [...Array(100000).keys()].reduce((r, i) => { r[i] = i; return r; }, {}); const a = Object.values(o).map(v => v + 1);
for
const o = [...Array(100000).keys()].reduce((r, i) => { r[i] = i; return r; }, {}); const a = []; for (p in o) { a.push(o[p] + 1); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.values
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):

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I'd be happy to explain the benchmark and its options.

**Benchmark Description**

The benchmark tests two ways of accessing an object's property values: `Object.values` and a traditional loop using `for...in`. The test case creates an object `o` by reducing an array of 100,000 keys using the `reduce()` method. The resulting object is then used to calculate the square of each value using either `Object.values` or a traditional loop.

**Options Compared**

The benchmark compares two options:

1. **`Object.values`**: This method returns an array containing all the property values of an object.
2. **Traditional Loop with `for...in`**: This approach uses a loop to iterate over the object's properties and calculates the square of each value.

**Pros and Cons**

**`Object.values`**:

Pros:

* Concise and expressive syntax
* Fast execution, as it avoids the overhead of iterating over the object's properties

Cons:

* May not be suitable for very large objects or complex objects with multiple inheritance paths (due to its use of `Object.prototype.toString()` under the hood)

**Traditional Loop with `for...in`**:

Pros:

* Can be more intuitive and easy to understand, especially for developers familiar with traditional loop patterns
* Does not have the same performance overhead as `Object.values`

Cons:

* More verbose syntax
* May be slower due to the iteration overhead

**Other Considerations**

In general, when working with objects in JavaScript, it's a good idea to consider using `Object.entries()` or `for...of` loops instead of `Object.keys()` or `for...in`. These newer methods offer improved performance and are more concise.

**Library and Special JS Feature**

Neither of the benchmark test cases uses any libraries. However, it does utilize JavaScript's modern syntax features, such as template literals (`\r\n`) in the `reduce` method.

**Other Alternatives**

If you're looking for alternative ways to access an object's property values, consider using:

* `Object.entries()`: Returns an array of a given object's own enumerable string-keyed property [key, value] pairs.
* `for...of` loops: Iterate over an object's properties using a loop that iterates over the property names.

Here is an example of how you could rewrite the benchmark test case using these alternatives:

```javascript
const o = [...Array(100000).keys()].reduce((r, i) => {
  r[i] = i;
  return r;
}, {});

// Using Object.entries()
for (const [key, value] of Object.entries(o)) {
  console.log(key + ": " + (value + 1));
}

// Using for...of loops
for (const key in o) {
  console.log(key + ": " + (o[key] + 1));
}
```

These alternatives offer improved performance and are more concise than the traditional loop approach.

Related benchmarks:

Object.values vs for (version: 1)

Comparing performance of: Object.values vs for

Created: 4 years ago by: Registered User

Jump to the latest result

Object.values

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):