Benchmark: Math.random() - MeasureThat.net

Script Preparation code:

var t = {d:{c:{a:{stamp: Date.now()}}}}
var t2 = t.d.c
var cache = t2.a

Tests:

A
var a = Math.random()
B
var a= Date.now()
C
var a = t2.a.stamp
D
var a = t.d.c.a.stamp
E
var a = cache.stamp

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
A
B
C
D
E

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

Measuring the performance of JavaScript functions is crucial for optimizing code and ensuring it runs efficiently. In this context, MeasureThat.net provides a platform to create and run microbenchmarks for various JavaScript scenarios.

**Benchmark Definition**

The provided JSON represents a benchmark definition. Here's what it tests:

* A variable `a` being assigned the result of `Math.random()`
* A timestamp obtained using `Date.now()` alone
* The same timestamp obtained by accessing `t2.a.stamp`, where `t2` is an object created from a complex nested structure (`{d:{c:{a:{stamp: Date.now()}}}}`)
* Another timestamp obtained by accessing `cache.stamp`, which is an alias for `t2.a.stamp`

**Options Compared**

The benchmark tests five different approaches to obtain a timestamp:

1. **Directly using `Date.now()`**: This method obtains the current timestamp without any intermediate variables.
2. **Using an object's property directly**: In this case, accessing `t2.a.stamp` to get the nested structure and then extract the `stamp` property.
3. **Using an alias for a nested structure**: Creating a complex nested structure (`{d:{c:{a:{stamp: Date.now()}}}}`) and storing it in a variable `cache`, which is then used to access the `stamp` property.

**Pros and Cons of Each Approach**

1. **Directly using `Date.now()`**:
	* Pros: Simple, straightforward, and potentially faster since it doesn't involve function calls or object lookups.
	* Cons: Might not be suitable for complex scenarios where intermediate variables are necessary.
2. **Using an object's property directly** (`t2.a.stamp`):
	* Pros: Avoids the overhead of creating a nested structure and assigning it to a variable.
	* Cons: Requires access to the `t2` object, which might not be readily available or could lead to additional function calls.
3. **Using an alias for a nested structure** (`cache`):
	* Pros: Can improve performance by caching the intermediate result and reusing it in subsequent executions.
	* Cons: Introduces an extra variable with potential memory overhead and requires careful management of cache validity.

**Library and Special JS Features**

None are mentioned in the provided JSON. However, if we consider external libraries or special JavaScript features that might be used in more complex benchmarks, they would likely include:

* External caching libraries to optimize performance.
* Profiling tools to measure execution time.
* WebAssembly (WASM) or other low-level languages for comparison.

**Alternatives**

If you need to compare the performance of different approaches in a benchmarking context, here are some alternatives to MeasureThat.net:

1. **Benchmark.js**: A popular JavaScript library for creating and running benchmarks.
2. **Bench.js**: A simple and lightweight benchmarking framework for Node.js.
3. **jsperf**: A web-based JavaScript profiling tool that can be used to measure execution time.

Keep in mind that each of these alternatives has its own strengths, weaknesses, and use cases. MeasureThat.net is specifically designed for comparing the performance of small JavaScript functions and microbenchmarks.

Related benchmarks:

Math.random() (version: 4)

Comparing performance of: A vs B vs C vs D vs E

Created: 8 years ago by: Registered User

Jump to the latest result

A

B

C

D

E

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):