Benchmark: Math.abs speed (Math.random)

Script Preparation code:

var x = Math.random()
var abs = Math.abs

Tests:

Math.abs access
Math.abs(x)
abs function
abs(x)
compare
x < 0 ? -x : x
bitshift
(x ^ (x >> 31)) - (x >> 31)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Math.abs access
abs function
compare
bitshift

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36

Browser/OS: Chrome 135 on Windows

View result in a separate tab

Test name	Executions per second
Math.abs access	39657148.0 Ops/sec
abs function	40623152.0 Ops/sec
compare	36850772.0 Ops/sec
bitshift	40231172.0 Ops/sec

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 data.

**Benchmark Definition JSON**

The provided JSON represents a benchmark definition, which is used to configure the test cases and execution settings for MeasureThat.net. Here's what each part of the JSON means:

* `"Name": "Math.abs speed (Math.random)"` - This is the name given to the benchmark.
* `"Description": null` - There is no description provided for this benchmark.
* `"Script Preparation Code": "var x = Math.random()\r\nvar abs = Math.abs"` - This script preparation code is used before running each test case. It initializes a variable `x` with a random value using `Math.random()` and also declares an empty function named `abs`.
* `"Html Preparation Code": null` - There is no HTML preparation code provided.

**Individual Test Cases**

The individual test cases are defined in the following JSON array:

```json
[
    {
        "Benchmark Definition": "Math.abs(x)",
        "Test Name": "Math.abs access"
    },
    {
        "Benchmark Definition": "abs(x)",
        "Test Name": "abs function"
    },
    {
        "Benchmark Definition": "x < 0 ? -x : x",
        "Test Name": "compare"
    },
    {
        "Benchmark Definition": "(x ^ (x >> 31)) - (x >> 31)",
        "Test Name": "bitshift"
    }
]
```

Here's what each test case does:

* `"Math.abs(x)"` and `"abs(x)"`: These test cases measure the speed of accessing `Math.abs` using two different syntaxes. In JavaScript, `Math.abs` is a built-in function that returns the absolute value of a number, while `abs()` is not a built-in function but can be implemented as a custom function.
* `"x < 0 ? -x : x"`: This test case measures the speed of an if-else statement with a ternary operator (`?:`), which checks whether `x` is less than zero and returns `-x` or `x` accordingly. Note that this syntax uses the older "short-circuit" style of ternary operators, whereas modern JavaScript uses the more concise syntax `"x < 0 ? -x : x;"`.
* `"(x ^ (x >> 31)) - (x >> 31)"`: This test case measures the speed of a bit manipulation operation using bitwise XOR (`^`) and shift operations (`>>`). The expression checks whether `x` is negative by performing a sign check through shifting `x` to the right by 31 bits.

**Library Usage**

In the provided benchmark, MeasureThat.net uses two libraries:

* `Math`: This is the built-in JavaScript library that provides mathematical functions, including `abs()`. However, since `abs()` is not a built-in function in most browsers, this test case measures the speed of accessing `Math.abs` using its full name.
* None: There is no explicit mention of any other libraries being used.

**Special JS Feature/Syntax**

There are no special JavaScript features or syntaxes explicitly mentioned in the provided benchmark data. However, it's worth noting that some of the test cases (e.g., `"x < 0 ? -x : x"` and `"abs(x)"`) use older or less common syntax for ternary operators.

**Alternatives**

For those interested in alternative benchmarks or ways to measure JavaScript performance:

* **V8 Benchmark**: A benchmark suite developed by Google that tests the performance of the V8 engine, which powers Chrome.
* **JSHint**: A benchmark that tests the performance and memory usage of various JavaScript engines.
* **BenchJS**: A collection of microbenchmarks for testing JavaScript performance.

These alternatives can provide more comprehensive insights into JavaScript performance and help developers identify areas for optimization.

Related benchmarks:

Math.abs speed (Math.random) (version: 0)

Comparing performance of: Math.abs access vs abs function vs compare vs bitshift

Created: 3 years ago by: Registered User

Jump to the latest result

Math.abs access

abs function

compare

bitshift

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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