Benchmark: UINT32Array - MeasureThat.net

Script Preparation code:

var a = {'a':'a','b':'b','c':'c','d':'d','e':'e','f':'f','g':'g','h':'h','c':'c','m':'m'}
var b = ['a','b','c','d','e','f','g','h','c','m'];

Tests:

a
var x = a['e'];
b
var index = b.indexOf('e');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
a
b

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser/OS: Chrome 120 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
a	31089078.0 Ops/sec
b	30746966.0 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark definition and test cases to explain what's being tested, compared, and analyzed.

**Benchmark Definition**

The benchmark is defined by two `Benchmark Definition` strings:

1. `"var x = a['e'];"`
2. `"var index = b.indexOf('e');"`

These define two simple JavaScript expressions that will be executed repeatedly to measure their performance.

**Script Preparation Code**

The `Script Preparation Code` string defines an object `a` with various properties, including some keys that are repeated (e.g., both `c`: 'c'). This is likely done to trigger any optimizations or caching mechanisms in the JavaScript engine, as the repeated key will cause a lookup in the object.

**Html Preparation Code**

There is no `Html Preparation Code` provided, which means the benchmark assumes a headless browser environment where the HTML document does not need to be parsed or executed.

**Individual Test Cases**

The two test cases are:

1. `"var x = a['e'];"` (Test Name: "a")
2. `"var index = b.indexOf('e');"` (Test Name: "b")

These test cases measure the performance of accessing an element in an object using bracket notation (`a['e']`) and iterating over an array to find an element using `indexOf` method.

**Libraries and Features**

There are no libraries mentioned explicitly in the benchmark definition. However, it's likely that a JavaScript engine or a browser is being tested.

The two test cases do not use any special JavaScript features like async/await, arrow functions, or modern syntax (e.g., template literals).

**Options Compared**

The benchmark compares the performance of two different approaches:

1. Accessing an element in an object using bracket notation (`a['e']`)
2. Iterating over an array to find an element using `indexOf` method (`b.indexOf('e')`)

These options are compared to see which one is faster, with the goal of identifying any performance differences between these two common use cases.

**Pros and Cons**

**Bracket Notation (a['e'])**:

* Pros:
	+ Shorter syntax
	+ Can be more efficient in some cases (e.g., when the object is stored in a cache)
* Cons:
	+ May trigger unnecessary computations or caching

**Array Iteration (`b.indexOf('e')`)**:

* Pros:
	+ More explicit and predictable behavior
	+ Can handle arrays with non-unique elements
* Cons:
	+ Longer syntax, potentially slower due to iteration overhead

**Other Considerations**

* The use of an object `a` with repeated keys may affect the performance results, as it could trigger caching or other optimizations.
* The choice of array `b` and its contents might also influence the performance outcome.

**Alternatives**

If you wanted to create a similar benchmark, you could try:

1. Comparing string concatenation (`"a + 'e'"`) vs. using a template literal (``${a}e``)
2. Evaluating the performance of array indexing (`b[5]`) vs. accessing an element in an object using bracket notation
3. Measuring the performance of `Array.prototype.includes()` vs. `indexOf()`

Keep in mind that these alternatives might not be directly comparable to the original benchmark, as they introduce different variables and scenarios.

Related benchmarks:

UINT32Array (version: 5)

Comparing performance of: a vs b

Created: 2 years ago by: Registered User

Jump to the latest result

a

b

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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