Benchmark: Object.keys vs _Object.keys vs Object_keys

Script Preparation code:

var _Object = Object;
var Object_keys = Object.keys;
var Object_getOwnPropertyDescriptor = Object.getOwnPropertyDescriptor;

var testCases = [];
for (var i = 0; i < 1000; i++) {
    testCases.push({ id: i });
}
var Test = (function () {
    function Test() {
    }
    Test.prototype.test1 = function () {
        for (var i = 0, len = testCases.length; i < len; i++) {
          	var testCase = testCases[i];
            Object.keys(testCase);
            Object.getOwnPropertyDescriptor(testCase, "id")
        }
    };
    Test.prototype.test2 = function () {
        for (var i = 0, len = testCases.length; i < len; i++) {
          	var testCase = testCases[i];
            _Object.keys(testCase);
            _Object.getOwnPropertyDescriptor(testCase, "id")
        }
    };
    Test.prototype.test3 = function () {
        for (var i = 0, len = testCases.length; i < len; i++) {
          	var testCase = testCases[i];
            Object_keys(testCase);
            Object_getOwnPropertyDescriptor(testCase, "id")
        }
    };
      Test.prototype.test4 = function () {
        var ObjectLocal = Object;
        for (var i = 0, len = testCases.length; i < len; i++) {
          	var testCase = testCases[i];
            ObjectLocal.keys(testCase);
            ObjectLocal.getOwnPropertyDescriptor(testCase, "id")
        }
    };
    return Test;
}());

Tests:

Object.keys
(new Test()).test1()
_Object.keys
(new Test()).test2()
Object_keys
(new Test()).test3()
ObjectLocal
(new Test()).test4()

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.keys
_Object.keys
Object_keys
ObjectLocal

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

LLMs can make mistakes. Check important info.

Measuring the performance of JavaScript's `Object.keys()`, `_Object.keys()` (which is likely a typo and should be `var _ = Object;` as in underscore.js), `Object_keys`, and `ObjectLocal` functions requires understanding what each function does, how they are implemented, and their potential differences.

**Function Overview**

1.  **`Object.keys()`**: This is the built-in JavaScript method that returns an array of a given object's own enumerable property names.
2.  **`_Object.keys()` (Underscore.js)**: In the benchmark code, `_Object.keys` seems to be referencing `_.keys` from the Underscore.js library. This function also returns an array of property names but with additional features like stability and handling for undefined properties compared to native JavaScript's `Object.keys()`.
3.  **`Object_keys`**: This appears to be a typo in the benchmark code, as it should probably be `var Object = Object; var keys = Object.keys;`. If this was intended to be a standalone function, its behavior would be identical to `Object.keys()`.
4.  **`ObjectLocal`**: This is a local alias for the global `Object`, similar to `_Object.keys()`. It's used in a way that mimics the behavior of `_Object.keys()`, but it doesn't provide additional features.

**Comparison and Performance Considerations**

-   **Native JavaScript (`Object.keys()`) vs. Underscore.js (`_Object.keys()`)**: The main difference between these two is stability. `Object.keys()` can return an empty array if the object has no enumerable properties, while `_Object.keys()` will always return a non-empty array, making it more reliable for certain use cases.

-   **Pros of `_Object.keys()`**: Stability and consistency.
    -   **Cons of `_Object.keys()`**: It adds complexity by relying on external libraries.
-   **Local Aliases (`ObjectLocal`)**: Using `ObjectLocal` is similar to using `_Object.keys()`, offering a way to ensure that `keys` is always available without having to require an additional library.

-   **Pros of `ObjectLocal`**: Reduced complexity compared to relying on external libraries.
    -   **Cons of `ObjectLocal`**: It may not provide the same level of stability as `_Object.keys()` due to potential issues with local scope and optimizations.

**Testing Options**

The benchmark compares four different methods for retrieving property names from an object:

*   Native JavaScript (`Object.keys()`)
*   Underscore.js (`_Object.keys()`)
*   Typo or alias (`Object_keys`)
*   Local alias (`ObjectLocal`)

When choosing a method, consider the need for stability and reliability in your application. If you require predictable behavior, especially when working with objects that may have no enumerable properties, `_Object.keys()` is a safer choice. However, if simplicity and reduced complexity are more important, `ObjectLocal` might be suitable.

**Other Alternatives**

Depending on the specific requirements of your project or personal preference, there are other methods for retrieving property names from an object:

*   Using the bracket notation (`object['property']`) is not generally considered a good practice due to its potential security implications.
*   For more complex use cases or those requiring functional programming principles, you might consider using libraries like Lodash (`_.keys()`), Ramda (`R.keys()`), or even writing your own utility functions.

Related benchmarks:

Object.keys vs _Object.keys vs Object_keys (version: 2)

Comparing performance of: Object.keys vs _Object.keys vs Object_keys vs ObjectLocal

Created: 9 years ago by: Registered User

Jump to the latest result

Object.keys

_Object.keys

Object_keys

ObjectLocal

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):