Benchmark: Qqqqqqqq - MeasureThat.net

Script Preparation code:

var as = [];
var as2 = [];
(function () {
  function A() {
    this.x = Math.random();
  }
  A.prototype.y = function (){};
  A.prototype.z = function (){};
  for (var i = 0; i < 15; ++i) {
    var a = new A();
    as.push(a);
    if (a.x < 0.5) {
      as2.push(a);
    }
  }
})();

Tests:

1
function f1 (run) { for (var i = 0; i < as.length; ++i) { if (run.length && as2.indexOf(as[1]) === -1) { as[i].y(); } else { as[i].z(); } } as = run.length ? as2 : as; }; f1([]); f1([1]);
2
function f2 (run) { if (run.length) { for (var i = 0; i < as.length; ++i) { if (as2.indexOf(as[1]) === -1) { as[i].y(); } } as = as2; } for (var i = 0; i < as.length; ++i) { as[i].z(); } }; f2([]); f2([1]);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
1
2

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 the world of JavaScript microbenchmarks on MeasureThat.net.

**Benchmark Definition JSON**

The provided JSON represents a benchmark definition, which defines two test cases: `f1` and `f2`. The code is written in JavaScript and appears to be testing the performance of different approaches to iterate through an array and apply methods to its elements.

**What is being tested?**

Two main options are compared:

1. **Option 1 (f1)**: Iterates over the `as` array using a simple `for` loop, checking if the length of `run` is truthy. If it is, it checks if `as2.indexOf(as[1]) === -1` and applies method `y()` to the current element. Otherwise, it applies method `z()`. Finally, it updates the `as` array based on the value of `run.length`.
2. **Option 2 (f2)**: Iterates over the `as` array using a simple `for` loop, but only applies method `y()` to elements where `as2.indexOf(as[1]) === -1`. After that, it simply assigns the `as` array to `as2`.

**Pros and Cons of each approach**

1. **Option 1 (f1)**
	* Pros:
		+ More flexible, as it allows for conditional execution of `y()` based on the value of `run.length`.
	* Cons:
		+ May lead to slower performance due to the additional checks.
2. **Option 2 (f2)**
	* Pros:
		+ Faster performance, as there are fewer operations and no unnecessary checks.
	* Cons:
		+ Less flexible, as it only applies `y()` to elements that meet a specific condition.

**Library usage**

In the provided code, the library `indexOf` is used in both test cases. The `indexOf` method is a built-in JavaScript function that returns the index of an element within an array if it exists, or -1 otherwise. This library is part of the ECMAScript standard and is widely supported across modern browsers.

**Special JS feature**

The provided code uses ES6 features such as arrow functions (`() => { ... }`), template literals (`${}`), and destructuring (`let [a] = new A()`). These features are widely supported in modern JavaScript environments, including Chrome 47 and later versions.

**Alternatives**

If the test cases were written differently, alternative approaches could be:

* Using `forEach` instead of `for` loops to iterate over arrays.
* Utilizing other methods like `map()`, `filter()`, or `reduce()` to process array elements.
* Leveraging modern JavaScript features like `let` and `const` for variable declarations.

However, given the simplicity and straightforwardness of the provided test cases, using a simple `for` loop is an efficient choice.

Related benchmarks:

Qqqqqqqq (version: 0)

Comparing performance of: 1 vs 2

Created: 9 years ago by: Guest

Jump to the latest result

1

2

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):