Benchmark: length of object

Tests:

Object.keys
const objCheck = { Gordon: 'gordon', Harry: 'harry', Jodie: 'jodie', Lisa: 'lisa', Michael: 'michael' }; const getLength = (obj) => { return Object.keys(obj).length; } getLength(objCheck);
Object.entries
const objCheck = { Gordon: 'gordon', Harry: 'harry', Jodie: 'jodie', Lisa: 'lisa', Michael: 'michael' }; const getLength = (obj) => { return Object.entries(obj).length; } getLength(objCheck);
Object.values
const objCheck = { Gordon: 'gordon', Harry: 'harry', Jodie: 'jodie', Lisa: 'lisa', Michael: 'michael' }; const getLength = (obj) => { return Object.values(obj).length; } getLength(objCheck);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.keys
Object.entries
Object.values

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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Let's break down the provided benchmark data.

**What is being tested?**

The benchmark measures the execution time of three different approaches to get the length of an object in JavaScript:

1. `Object.keys()`: This method returns an array of a given object's own enumerable property names.
2. `Object.entries()`: This method returns an array of a given object's key-value pairs as [key, value] arrays.
3. `Object.values()`: This method returns an array containing all the values of a given object.

**Options being compared**

The three options are being compared to determine which one is the fastest for this specific benchmark.

**Pros and Cons of each approach:**

1. **`Object.keys()`**:
	* Pros: Simple, widely supported, and easy to understand.
	* Cons: Returns an array of property names, not the actual length of the object (i.e., number of properties).
2. **`Object.entries()`**:
	* Pros: Returns an array of key-value pairs, which can be useful in some cases.
	* Cons: More computationally expensive than `Object.keys()`, as it needs to create an array of arrays.
3. **`Object.values()`**:
	* Pros: Returns an array of values, which is more concise than returning an array of property names.
	* Cons: Less intuitive for some developers, and may be slower than `Object.keys()` due to its additional complexity.

**Library usage**

None of the benchmark cases explicitly use any libraries.

**Special JS features or syntax**

There are no special JavaScript features or syntax used in these benchmark cases. They rely on standard ECMAScript language features.

Now, let's discuss alternative approaches:

* **Using `Object.getOwnPropertyNames()`**: This method returns an array of a given object's own enumerable property names, but it is not supported in older browsers and may be slower than `Object.keys()`.
* **Using `for...in` loop**: This can be used to iterate over an object's properties, but it is less efficient and more verbose than the three options being compared.
* **Using a library like Lodash**: Lodash provides a `keys()` function that returns an array of property names. While this approach may provide additional benefits (e.g., caching), it also introduces external dependencies.

Keep in mind that benchmarking results can vary depending on the specific use case, JavaScript version, and browser being used.

Related benchmarks:

length of object (version: 0)

get length of object

Comparing performance of: Object.keys vs Object.entries vs Object.values

Created: 2 years ago by: Guest

Jump to the latest result

Object.keys

Object.entries

Object.values

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):