Benchmark: unshift01001 - MeasureThat.net

Script Preparation code:

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

Tests:

[123].concat(a)
b = [123].concat(a) console.log(b)
console.log(a.length)
console.log(a.length)
unshift
a.unshift(123) console.log(b)
console.log(a.length) - 2
console.log(a.length)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
[123].concat(a)
console.log(a.length)
unshift
console.log(a.length) - 2

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
[123].concat(a)	28545.7 Ops/sec
console.log(a.length)	17526.7 Ops/sec
unshift	6334.2 Ops/sec
console.log(a.length) - 2	16612.5 Ops/sec

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

LLMs can make mistakes. Check important info.

**What is being tested?**

MeasureThat.net is testing the performance of different JavaScript operations on arrays in various browsers. The test cases are designed to compare the execution time and throughput of these operations.

The tests cover three main areas:

1. **Array concatenation**: Creating a new array by concatenating an existing array with another array or a single element.
2. **Array length**: Logging the length of an array.
3. **Array unshift**: Adding an element to the beginning of an array.

**Options being compared**

The tests compare different approaches for each operation:

1. **Array concatenation**:
	* Concatenating with `concat()`: Creating a new array by calling the `concat()` method on the original array.
	* Assigning to a new variable: Storing the result of the concatenation in a new variable, e.g., `b = [123].concat(a)`.
2. **Array length**:
	* Logging with `console.log()`: Simply logging the length of the array using the built-in `console.log()` function.
3. **Array unshift**:
	* Unshifting an element: Using the `unshift()` method to add an element to the beginning of the array.

**Pros and cons of each approach**

Here's a brief summary of the pros and cons of each approach:

1. **Array concatenation**:
	* Concatenating with `concat()`: Can be slower due to the creation of a new array.
	* Assigning to a new variable: Can lead to intermediate results being created, which might not be desirable in some scenarios.
2. **Array length**:
	* Logging with `console.log()`: Simple and straightforward, but may involve extra overhead due to logging.
3. **Array unshift**:
	* Unshifting an element: Can be slower than other approaches, especially for large arrays.

**Special JS features**

In this benchmark, the following special JS feature is used:

1. **Template literals**: Used in the test cases to create new arrays or perform operations on existing ones.

Template literals are a feature introduced in ECMAScript 2015 (ES6). They allow you to embed expressions inside string literals using backticks (`) instead of single quotes or double quotes.

**Library usage**

None of the test cases explicitly use any libraries, but they do rely on built-in JavaScript features and the `console` object for logging.

**Alternatives**

If you wanted to write a similar benchmark, you could consider the following alternatives:

1. Use a different browser or version.
2. Add more test cases to cover other array operations (e.g., `slice()`, `splice()`, etc.).
3. Include tests for other JavaScript features not covered in this benchmark (e.g., closures, arrow functions, async/await, etc.).
4. Consider using a different testing framework or library (e.g., Jest, Mocha, Cypress, etc.).

Keep in mind that the results of your benchmark might differ from MeasureThat.net's due to differences in implementation, test harness, and execution environment.

Related benchmarks:

unshift01001 (version: 0)

Comparing performance of: [123].concat(a) vs console.log(a.length) vs unshift vs console.log(a.length) - 2

Created: 3 years ago by: Guest

Jump to the latest result

[123].concat(a)

console.log(a.length)

unshift

console.log(a.length) - 2

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):