Benchmark: unshift123 - MeasureThat.net

Script Preparation code:

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

Tests:

[123].concat(a)
[123].concat(a)
splice
a.splice(0,0,123)
reverse.push.reverse
a.reverse().push(123) a.reverse()
unshift
a.unshift(123)
print a
console.log(a)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
[123].concat(a)
splice
reverse.push.reverse
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
[123].concat(a)	1003915.8 Ops/sec
splice	1779.8 Ops/sec
reverse.push.reverse	15005.0 Ops/sec
unshift	36297.7 Ops/sec
print a	29.5 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark definition and test cases, explaining what's being tested, the pros and cons of each approach, and other considerations.

**Benchmark Definition**

The benchmark definition is a JSON object that represents the code to be executed in each test case. In this case, there are five test cases:

1. `concat`: Concatenates an array with another array using the `[123].concat(a)` syntax.
2. `splice`: Inserts a value at the beginning of an array using the `a.splice(0,0,123)` syntax.
3. `reverse.push.reverse`: Reverses an array and then pushes a value into it using the `a.reverse().push(123)\r\na.reverse()` syntax.
4. `unshift`: Inserts a value at the beginning of an array using the `a.unshift(123)` syntax.
5. `print a`: Simply prints the contents of an array to the console using the `console.log(a)` syntax.

**Libraries**

None of these test cases rely on any external libraries.

**Special JS Features or Syntax**

The following features are used:

* Concatenation (`[123].concat(a)`)
* Splice (`a.splice(0,0,123)`)
* Reverse method and push operator (`a.reverse().push(123)\r\na.reverse()`)
* Unshift method (`a.unshift(123)`)
* `console.log` statement

**Options Compared**

The tests are comparing the performance of different array manipulation methods:

1. Concatenation vs. Splice: This test case compares the time it takes to add an element to the beginning of an array using either concatenation or splice.
2. Reverse method and push operator vs. Unshift method: This test case compares the time it takes to reverse an array and then push a value into it versus inserting a value at the beginning of the array using unshift.

**Pros and Cons**

Here are some pros and cons for each approach:

1. Concatenation (`[123].concat(a)`):
	* Pros:
		+ Simple and easy to understand
	* Cons:
		+ Creates a new array object, which can be expensive in terms of memory allocation
2. Splice (`a.splice(0,0,123)`):
	* Pros:
		+ Modifies the original array, reducing memory allocation overhead
	* Cons:
		+ Can be slower than concatenation due to the complexity of the splice operation
3. Reverse method and push operator (`a.reverse().push(123)\r\na.reverse()`):
	* Pros:
		+ Reverses the entire array, which can be faster for large arrays
	* Cons:
		+ Pushes a value into the reversed array, which can be slower than using unshift
4. Unshift method (`a.unshift(123)`):
	* Pros:
		+ Inserts a value at the beginning of the array in a single operation
	* Cons:
		+ Can be slower due to the need to reverse the entire array

**Other Considerations**

When choosing an array manipulation method, consider the following factors:

1. Performance: Splice is generally faster than concatenation for large arrays.
2. Memory allocation: Concatenation creates a new array object, while splice modifies the original array.
3. Code readability: Simple and easy-to-understand methods like concatenation can be preferable over more complex operations like splice.

**Alternatives**

For comparison, other array manipulation methods could include:

1. Array slicing (`a.slice(0, 0).push(123)`)
2. Array construction with the `Array` constructor (`new Array(0).push(123)`)

Keep in mind that these alternatives may not provide a significant difference in performance compared to the tested methods.

In conclusion, this benchmark compares the performance of different array manipulation methods in JavaScript: concatenation, splice, reverse method and push operator, unshift, and printing an array. The tests highlight the trade-offs between memory allocation, performance, and code readability when choosing these methods.

Related benchmarks:

unshift123 (version: 0)

Comparing performance of: [123].concat(a) vs splice vs reverse.push.reverse vs unshift vs print a

Created: 3 years ago by: Guest

Jump to the latest result

[123].concat(a)

splice

reverse.push.reverse

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):