Benchmark: slice with array and string

Script Preparation code:

var s3 = "12";
var s4 = "123";
var s1 = ['1', '2'];
var s2 = ['1', '2', '3'];

Tests:

with array
let n1 = s1.slice(-1)[0]; let n2 = s2.slice(-1)[0];
with string
let n3 = s3.slice(-1)[0]; let n4 = s4.slice(-1)[0];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
with array
with string

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.93 Safari/537.36

Browser/OS: Chrome 90 on Windows

View result in a separate tab

Test name	Executions per second
with array	2336975.2 Ops/sec
with string	2961981.2 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided JSON for measuring JavaScript performance.

**Benchmark Definition**

The benchmark measures the performance of `slice()` on arrays and strings. The script preparation code defines two variables, `s1` and `s2`, which are assigned array values, and `s3` and `s4`, which are assigned string values. These variables are then used in two test cases.

**Test Cases**

There are two individual test cases:

1. "with array"
   The benchmark definition is: `let n1 = s1.slice(-1)[0];\r\nlet n2 = s2.slice(-1)[0];`

This test case measures the performance of slicing the last element from an array.

2. "with string"
   The benchmark definition is: `let n3 = s3.slice(-1)[0];\r\nlet n4 = s4.slice(-1)[0];`

This test case measures the performance of slicing the last character from a string.

**Comparison Options**

In this benchmark, two approaches are compared:

* Slicing an array using `slice()` method
* Slicing a string using `slice()` method

**Pros and Cons of Each Approach:**

* **Slicing Array:**
	+ Pros:
		- Fast, as it only needs to access the last element of the array.
		- Can be optimized by JavaScript engine for performance.
	+ Cons:
		- May involve additional memory allocations or copying if the resulting array is not small enough.
* **Slicing String:**
	+ Pros:
		- Fast, as it only needs to access the last character of the string.
		- Can be optimized by JavaScript engine for performance.
	+ Cons:
		- May be slower than slicing arrays, especially for large strings.

**Library Usage**

None of the test cases use any external libraries. The `slice()` method is a built-in JavaScript function that works on both arrays and strings.

**Special JS Features or Syntax**

There are no special features or syntax used in this benchmark. It only utilizes standard JavaScript syntax and built-in methods (`slice()`) for performance comparison.

**Other Alternatives**

Some alternative approaches to measure the performance of string slicing could include:

* Using `String.prototype.substr()` method instead of `slice()`
* Comparing the performance of different string handling libraries (e.g., using a library like `string-polyfill`)

However, these alternatives are not part of this benchmark and would require modifications to the test cases.

Keep in mind that measuring performance can be complex, as it depends on various factors such as system configuration, hardware, and browser. This benchmark provides a simple example of how `slice()` is used to measure performance, but real-world scenarios may involve more nuanced considerations.

Related benchmarks:

slice with array and string (version: 0)

Comparing performance of: with array vs with string

Created: 3 years ago by: Guest

Jump to the latest result

with array

with string

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):