Benchmark: str.match vs str.split.pop

Script Preparation code:

string = "This is a benchmark to test if matching a regex is faster that splitting a string";
regex = /\S+/gi;

Tests:

str.match
string.match(regex)
str.split.pop
string.split(" ").pop()

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
str.match
str.split.pop

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.99 Safari/537.36

Browser/OS: Chrome 97 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
str.match	962207.6 Ops/sec
str.split.pop	3972528.2 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 benchmark definition and test cases to understand what is being tested.

**Benchmark Definition**

The benchmark definition provides two separate tests:

1. `string.match(regex)`: This test measures the performance of the `match()` method, which searches for a regular expression (regex) pattern within a string.
2. `string.split(" ").pop()`: This test measures the performance of the `split()` and `pop()` methods, which splits a string into an array of substrings using whitespace as the separator and then returns the last element.

**Options Compared**

The two tests compare the following options:

* Using regular expressions (`string.match(regex)`) versus
* Splitting a string using whitespace and then accessing the last element (`string.split(" ").pop()`)

**Pros and Cons**

Here are some pros and cons of each approach:

1. `string.match(regex)`:
	* Pros: Can be more efficient for searching specific patterns, can handle complex regular expressions.
	* Cons: May be slower for simple string matching, can be computationally expensive for large strings or complex regex patterns.
2. `string.split(" ").pop()`:
	* Pros: Simple and straightforward, can be faster for simple string splitting tasks.
	* Cons: Requires a predefined separator (in this case, whitespace), may not handle all edge cases (e.g., multi-line strings).

**Library/Functionality**

In the benchmark code, the `string.match(regex)` function is used. The regex pattern `/\\S+/gi` matches one or more non-space characters (`\S+`) globally (`i`) and with the ignore case option.

There are no libraries or functionalities being tested in this benchmark, as it only uses built-in JavaScript methods.

**Special JS Features/Syntax**

The benchmark does not use any special JavaScript features or syntax that would affect its results. It is a straightforward comparison of two simple string manipulation operations.

**Alternatives**

Other alternatives to measuring the performance of these string manipulation operations could include:

* Using a different separator for splitting strings (e.g., `/`, `\t`, etc.)
* Using a different regex pattern or modifier
* Adding more test cases with varying input sizes, edge cases, or complexities
* Comparing other string manipulation methods, such as `indexOf()`, `slice()`, or `replace()`

These alternatives could provide additional insights into the performance characteristics of these operations and help identify potential bottlenecks in real-world applications.

Related benchmarks:

str.match vs str.split.pop (version: 0)

Comparing performance of: str.match vs str.split.pop

Created: 4 years ago by: Guest

Jump to the latest result

str.match

str.split.pop

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):