Benchmark: parse line2 - MeasureThat.net

Script Preparation code:



let i = 0

Tests:

split then equality
const iterations = 10000; const str = "int var = 1000;" const firstWord = str.split(" ")[0] let acc = "" for(let i = 0; i < iterations; i++){ switch(firstWord){ case "int": break case "float": break case "//": break case "uniform": break case "attribute": break case "struct": break default: break } }
check each time
const iterations = 10000; const str = "int var = 1000;" let acc = "" for(let i = 0; i < iterations; i++){ if(str.startsWith("int")){ } else if(str.startsWith("float")){ }else if(str.startsWith("//")){ }else if(str.startsWith("uniform")){ }else if(str.startsWith("attribute")){ }else if(str.startsWith("struct")){ }else if(str.startsWith("//")){ }else { } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
split then equality
check each time

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Measuring performance in JavaScript is crucial for optimizing code and improving overall developer productivity.

The provided benchmark, "parse line2," tests the speed of parsing a line of code with split() versus repeated checks on individual characters.

**Options Compared:**

1. **Split() method**: The `split()` method splits a string into an array of substrings based on a specified separator. In this case, it's used to extract the first word from a line of code.
2. **Repeated checks on individual characters**: This approach involves checking each character individually to identify the keyword.

**Pros and Cons:**

1. **Split() method**:
	* Pros:
		+ Faster, as it uses optimized string splitting algorithms.
		+ More concise and readable code.
	* Cons:
		+ May not work correctly for all edge cases (e.g., punctuation next to the keyword).
2. **Repeated checks on individual characters**:
	* Pros:
		+ More robust handling of edge cases (e.g., punctuation next to the keyword).
	* Cons:
		+ Slower, as it involves multiple character checks.
		+ Less concise and more verbose code.

**Library:**

There is no explicit library mentioned in the benchmark definition. However, the `split()` method is a built-in JavaScript function, while the repeated check approach relies on basic string manipulation.

**Special JS Feature/Syntax:**

* **Template literals**: The line of code being parsed uses template literals (`"int var = 1000;"`), which are a feature introduced in ECMAScript 2015 (ES6). While this might be specific to certain JavaScript versions or environments, the benchmark is designed to work across various platforms.

**Other Considerations:**

* **Performance**: The benchmark aims to compare the performance of two approaches. In general, using optimized built-in functions like `split()` can lead to better performance.
* **Code readability and maintainability**: The repeated check approach might be less readable and more prone to errors due to its complexity.

**Alternatives:**

If you're looking for alternative approaches or optimization techniques for parsing lines of code in JavaScript:

1. Use regular expressions (regex) instead of `split()` for more complex pattern matching.
2. Implement a custom parser using a finite state machine or recursive descent parser for optimal performance and control over the parsing process.
3. Consider using a dedicated JavaScript library or framework that provides optimized string manipulation functions, such as lodash or underscore.js.

Keep in mind that each approach has its trade-offs in terms of performance, code readability, and maintainability. The choice ultimately depends on your specific use case, performance requirements, and personal coding style preferences.

Related benchmarks:

parse line2 (version: 1)

speed up from using split and equality vs. repeated checks on line.

Comparing performance of: split then equality vs check each time

Created: 4 years ago by: Registered User

Jump to the latest result

split then equality

check each time

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):