Benchmark: test array / attributes 2

HTML Preparation code:

<div id=''></div>

Script Preparation code:

var users = { "cust":{"name":"philippe", "id":"1"}, "user":{"name":"agnes", "id":"2"}};
var arr = [{"id":"1", "name":"philippe", "type":"cust"},{"id":"2", "name":"agnes", "type":"user"}];

Tests:

array
let t1 = arr.find(function(o) { return o.type == "user"}).name;
attribute
let t2 = users.user.name
array for
function find(arr2, a) { for (let i=0; i < arr2.length; i++) { if (arr2[i] == a) return arr2[i].name; } } t = find(arr, "user")

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
array
attribute
array for

Fastest: N/A

Slowest: N/A

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

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Measuring the performance of JavaScript code is crucial to optimize and improve application efficiency.

**Benchmark Analysis**

The provided benchmark, `test array / attributes 2`, tests three different approaches:

1. **Array Indexing**: The first test case, "array", checks the speed of accessing an attribute by its index using the dot notation (`arr.find(function(o) { return o.type == "user"}).name`). This is a basic operation in JavaScript and is often used for simple data retrieval.
2. **Attribute Access**: The second test case, "attribute", measures the speed of directly accessing an attribute without any additional operations, like the dot notation. In this case, `users.user.name` is the expression being evaluated.
3. **Custom Function**: The third test case, "array for", uses a custom function, `find`, to iterate through the array and retrieve the desired value.

**Approach Comparison**

*   **Array Indexing vs. Attribute Access**: In terms of performance, attribute access tends to be faster than array indexing because it bypasses the iteration process. However, in JavaScript, object property access can sometimes involve additional operations like type checking, which might lead to slightly slower results.
*   **Custom Function**: The custom function approach, `find`, introduces overhead due to function call and argument passing. This method is generally slower than direct attribute access or array indexing.

**Pros and Cons**

*   **Array Indexing**:
    *   Pros: Fast, straightforward, and suitable for simple data retrieval.
    *   Cons: May not work well with large datasets or objects with many attributes.
*   **Attribute Access**:
    *   Pros: Can be faster than array indexing and is often used in object-oriented programming.
    *   Cons: Requires the property to exist; if it doesn't, an error will occur.
*   **Custom Function**:
    *   Pros: More flexible and can handle complex logic but may introduce overhead due to function call.
    *   Cons: Can be slower than direct attribute access or array indexing.

**Other Considerations**

When measuring JavaScript performance, other factors like the specific JavaScript engine, browser version, and system configuration can impact results. Additionally, some optimizations might be affected by these factors.

In terms of alternative approaches:

*   **Using a library or framework**: Libraries like Lodash provide optimized versions of common functions, including `find`, which can lead to better performance.
*   **Using iterators or generators**: Iterators and generators allow for more efficient data processing without the need for explicit loops.

**Library Usage**

In this benchmark, the `users` object is defined using a simple JavaScript literal. There are no external libraries used in this case, but using a library like Lodash could potentially improve performance by providing optimized versions of common functions.

**Special JS Features or Syntax**

There are some special features and syntaxes being used here:

*   **Function expressions**: The `find` function is defined as an expression, which allows it to be called immediately.
*   **Template literals**: Although not explicitly used in this benchmark, template literals can provide more readable string interpolation.

Overall, the choice of approach depends on the specific requirements and constraints of your use case. Understanding the trade-offs between different methods can help you optimize your code for better performance.

Related benchmarks:

test array / attributes 2 (version: 1)

Comparing performance of: array vs attribute vs array for

Created: 7 years ago by: Registered User

Jump to the latest result

array

attribute

array 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):