Benchmark: horrible micro-optimization

Script Preparation code:

var s = ">>";
var result = "";

Tests:

startsWith + index
for (let k = 0; k < 10000; k++) { if (s.startsWith(">") && s[1] != ">") { result = s.substring(1); } }
startsWith + startsWith
for (let k = 0; k < 10000; k++) { if (s.startsWith(">") && !s.startsWith(">>")) { result = s.substring(1); } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
startsWith + index
startsWith + startsWith

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested, compared, and their pros and cons.

**Benchmark Definition**

The benchmark is defined by a JSON object with three properties:

1. `Name`: A descriptive name for the benchmark, which in this case is "horrible micro-optimization".
2. `Description`: A brief description of the benchmark, which seems to be a humorous comment.
3. `Script Preparation Code` and `Html Preparation Code`: These are the setup code snippets that are executed before running the actual benchmark.

In this case, the `Script Preparation Code` defines two variables: `s` (a string containing ">">") and `result` (an empty string). The `Html Preparation Code` is null, which means no HTML preparation is required.

**Individual Test Cases**

The benchmark consists of two test cases, each with a unique name:

1. "startsWith + index"
2. "startsWith + startsWith"

Each test case has a single line of code that uses the `startsWith()` method to check if the string `s` starts with ">". The main difference between the two test cases is the second argument passed to `startsWith()`: either an integer index or another string.

**What's being tested**

The benchmark is testing the performance difference between these two approaches:

1. Using the `index` argument (test case "startsWith + index")
2. Using the `string` argument (test case "startsWith + startsWith")

**Options compared**

In this case, we have only two options to compare:

1. **Using an integer index**: This approach uses the second character of the string (`s[1]`) as the comparison value.
2. **Using another string as a comparison value**: This approach uses the `startsWith()` method with another string (`">>\"`) as the comparison value.

**Pros and Cons**

Here's a brief analysis of each approach:

* **Using an integer index**:
	+ Pros: Simple, straightforward, and easy to understand.
	+ Cons: May lead to issues if the second character is not zero-indexed or has special meaning in the context.
* **Using another string as a comparison value**:
	+ Pros: Can be more accurate, especially when comparing to a specific substring.
	+ Cons: May introduce additional overhead due to the extra string creation and comparison.

It's worth noting that both approaches can lead to issues if not handled correctly. For example, if `s` contains special characters or is not properly encoded, using an integer index could lead to unexpected behavior.

**Library usage**

There is no explicit library used in this benchmark. However, it's likely that the JavaScript engine being tested (e.g., V8 in Chrome) provides the `startsWith()` method implementation, which is a part of the ECMAScript standard.

**Special JS features or syntax**

The only special feature used here is the `startsWith()` method, which is a part of the ECMAScript standard. However, it's worth noting that some older browsers may not support this method or have variations with slightly different behavior.

**Alternatives**

If you were to create your own benchmark for similar purposes, you could consider exploring other optimization techniques, such as:

* Using native code (e.g., assembly) instead of JavaScript
* Optimizing string manipulation using specialized libraries or algorithms
* Examining the performance implications of different data structures (e.g., arrays vs. linked lists)

Keep in mind that each approach has its trade-offs and may require significant changes to your benchmarking strategy.

Related benchmarks:

horrible micro-optimization (version: 0)

oh god kill me I'm tired of this

Comparing performance of: startsWith + index vs startsWith + startsWith

Created: 2 years ago by: Guest

Jump to the latest result

startsWith + index

startsWith + startsWith

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):