Benchmark: !!a && b or a && b

Tests:

!!a && b
const a = ''; const b = 'yes'; const c = !!a && b; console.log(c);
a && b
const a = ''; const b = 'yes'; const c = a && b; console.log(c);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
!!a && b
a && b

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:107.0) Gecko/20100101 Firefox/107.0

Browser/OS: Firefox 107 on Windows

View result in a separate tab

Test name	Executions per second
!!a && b	152295.0 Ops/sec
a && b	153787.3 Ops/sec

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

LLMs can make mistakes. Check important info.

Measuring the performance of JavaScript benchmarks can be a complex task, as it involves understanding various aspects of the language. Let's break down what's being tested and compare different approaches.

**Benchmark Definition**
The provided benchmark definition is a simple logical expression: `!!a && b or a && b`. This expression is true if either of the two conditions is true. The `!!` operator converts its operand to a boolean value (true if the operand is truthy, false otherwise). The `&&` operator has a lower precedence than the `or` operator.

**Options Compared**
The benchmark compares two approaches:

1. `!!a && b`: This approach uses the `!!` operator to convert `a` to a boolean value before evaluating the expression.
2. `a && b`: This approach evaluates `b` first, and only then checks if `a` is truthy.

**Pros and Cons**

* **!!a && b**:
	+ Pros: This approach can be faster because it avoids the overhead of converting a string to a boolean value using `!!`.
	+ Cons: If `a` is an empty string (`''`), this expression will evaluate to false, even if `b` is true. This could lead to incorrect results.
* **a && b**:
	+ Pros: This approach ensures that the empty string check is performed correctly and avoids unnecessary boolean conversions.
	+ Cons: This approach may be slower due to the additional evaluation step.

**Library**
There is no specific library being tested in this benchmark. However, it's worth noting that some JavaScript engines (like SpiderMonkey) have optimizations for boolean literals and conditional expressions.

**Special JS Features/Syntax**
None of the benchmark test cases use special JavaScript features or syntax beyond basic logical operators.

**Other Alternatives**
Some alternative approaches to consider:

* **Use a more efficient comparison operator**: In JavaScript, you can use the `===` (strict equality) operator for more precise comparisons.
* **Avoid unnecessary boolean conversions**: If possible, try to avoid converting values to booleans using `!!` or other operators.
* **Test different string representations**: Some engines may optimize for specific string formats (e.g., `''`, `"hello"`, etc.). Testing with different strings can help identify engine-specific optimizations.

Keep in mind that these alternatives might not be relevant to the specific benchmark being tested, and the results may vary depending on the JavaScript engine and platform.

Related benchmarks:

!!a && b or a && b (version: 0)

Comparing performance of: !!a && b vs a && b

Created: 2 years ago by: Guest

Jump to the latest result

!!a && b

a && b

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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