Benchmark: elielielieli - MeasureThat.net

Script Preparation code:

var arr = [0,1,2,3,4];

Tests:

tilda
if (!~arr.indexOf(4)) { console.log('found') }
equlas
if (!arr.indexOf(4) === -1 ) { console.log('found') }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
tilda
equlas

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.

Let's dive into explaining the benchmark.

The provided JSON represents a JavaScript microbenchmark test case, where two different approaches are compared: using the tilde operator (~) and using the equality operator (==). These two operators are used to check if a value is present in an array.

**Tilde Operator (~)**

The tilde operator is a bitwise NOT operator. In the context of arrays, it checks if the value is not included in the array. The syntax `~arr.indexOf(4)` returns -1 if the value is not found, and 0 if it's found. This is because JavaScript treats falsey values (e.g., 0, '', null, undefined) as truthy, while non-falsy values are considered falsey.

**Equality Operator (==)**

The equality operator checks for exact equality between two values. In this case, `arr.indexOf(4) === -1` is used to check if the value 4 is not found in the array. This approach can lead to unexpected results because of JavaScript's loose equality rules.

Pros and Cons:

* **Tilde Operator (~)**:
	+ Pros: More concise and efficient way to check for presence.
	+ Cons: Can be less readable, especially for those unfamiliar with bitwise operators.
* **Equality Operator (==)**:
	+ Pros: More straightforward and easy to understand for some developers.
	+ Cons: Less efficient due to the loose equality rules.

Other Considerations:

* The `executionsPerSecond` value indicates the number of times each test was executed per second. A higher value typically suggests better performance.
* The `DevicePlatform` and `OperatingSystem` fields provide information about the browser's hardware and software configuration.

Now, let's talk about libraries used in this benchmark.

There is no library explicitly mentioned in the provided JSON. However, it's likely that the JavaScript engine (V8) or other underlying technologies are using some internal optimizations to compare these two operators.

Special JS Feature/Syntax:

There is a special case being tested here: the tilde operator (~). It's an often-overlooked but useful feature in JavaScript.

Alternatives:

For more advanced benchmarking, you might consider exploring libraries like:

1. **Benchmark.js**: A popular and widely-used library for writing cross-browser benchmarks.
2. **Microbenchmarks**: A collection of small benchmarks for various JavaScript engines and architectures.
3. **JSHint's Benchmark**: JSHint's built-in benchmarking tool provides a simple way to compare different code snippets.

Keep in mind that the best approach depends on your specific use case, performance requirements, and target audience.

Related benchmarks:

elielielieli (version: 0)

Comparing performance of: tilda vs equlas

Created: 8 years ago by: Guest

Jump to the latest result

tilda

equlas

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):