Benchmark: concat unshift - MeasureThat.net

Script Preparation code:

a = [1,2,3,4,5]

Tests:

concat(a)
[123].concat(a)
console log
console.log(a.lenght)
unshift
a.unshift(123)
print a
console.log(a.lenght)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
concat(a)
console log
unshift
print a

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.96 Safari/537.36

Browser/OS: Chrome 88 on Linux

View result in a separate tab

Test name	Executions per second
concat(a)	1014229.9 Ops/sec
console log	91826.4 Ops/sec
unshift	38188.0 Ops/sec
print a	16843.7 Ops/sec

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

LLMs can make mistakes. Check important info.

**Benchmark Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The provided benchmark definition and test cases are used to measure the performance of different JavaScript operations.

**Test Cases**

The test cases are designed to compare the performance of three different approaches:

1. `concat(a)`: This test case measures the performance of concatenating an array using the `concat()` method.
2. `console.log(a.length)`: This test case measures the performance of accessing the length property of an array using `console.log()`.
3. `unshift(123, a)`: This test case measures the performance of adding an element to the beginning of an array using the `unshift()` method.

The test cases are executed in sequence, and the raw execution time is measured for each test.

**Options Compared**

The options being compared in this benchmark are:

* `concat()`: A built-in JavaScript method that concatenates arrays.
* `console.log()`: A built-in JavaScript function used for logging output to the console. In this case, it's used to access the length property of an array.
* `unshift()`: A built-in JavaScript method that adds elements to the beginning of an array.

**Pros and Cons**

Here are some pros and cons of each approach:

* `concat()`:
	+ Pros: Simple and straightforward. No need to modify the original array.
	+ Cons: Creates a new array, which can be inefficient for large arrays.
* `console.log(a.length)`: (Actually, it should be `a.length`, not `a.lenght`)
	+ Pros: Fast access to the length property of an array. Does not create a new array or modify the original one.
	+ Cons: Uses `console.log()`, which may have performance implications due to its asynchronous nature and potential caching effects.
* `unshift(123, a)`: (Note that `a` is an array and should be accessed with dot notation)
	+ Pros: Efficient insertion of elements at the beginning of an array. Does not create a new array or modify the original one in place.
	+ Cons: May have performance implications due to the overhead of adding an element to the beginning of an array.

**Library Usage**

There is no explicit library usage in this benchmark definition, but `console.log()` relies on the browser's console API, which may involve some overhead. However, for most use cases, the impact should be negligible.

**Special JS Feature or Syntax**

None of the test cases use any special JavaScript features or syntax that would affect their performance. The focus is solely on measuring the performance of basic array operations.

**Alternatives**

If you need to measure the performance of different approaches in a specific scenario, here are some alternatives:

* For concatenating arrays: You can use `Array.prototype.concat()` and create an empty array using `[]`.
* For accessing array length: You can use `a.length` directly.
* For adding elements to an array: You can use `unshift()`, but also consider using other methods like `splice()` or `push()` depending on your specific requirements.

Keep in mind that the performance of these alternatives may vary depending on the specific browser, engine, and scenario. MeasureThat.net is designed to provide a baseline measurement for common JavaScript operations.

Related benchmarks:

concat unshift (version: 0)

Comparing performance of: concat(a) vs console log vs unshift vs print a

Created: 3 years ago by: Guest

Jump to the latest result

concat(a)

console log

unshift

print a

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):