Benchmark: trim vs replace - MeasureThat.net

Script Preparation code:

var example = '  there is no spoon'

Tests:

trime
var r = example.trim()
replace
var r = example.replace(/^\s/g, '')

Historical Performance Data aggregated from 11 community runs

Desktop Results:

Chrome 11 runs

trime

22.8M/s

replace

14.2M/s

Fastest: trime (1.6x faster)

View exact numbers

✓ trime: 22,779,374 ops/sec
• replace: 14,225,216 ops/sec

Results show median performance across all community submissions. Run this benchmark yourself to verify on your device.

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
trime
replace

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36

Browser/OS: Chrome 136 on Mac OS X 10.15.7

View result in a separate tab

trime

133.4M/s

replace

42.9M/s

View exact numbers

Test name	Executions per second
✓ trime	133,360,776 Ops/sec
replace	42,929,604 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark definition and test cases to understand what's being tested.

**Benchmark Definition:**
The benchmark is comparing two approaches for string trimming in JavaScript:

1. `trim()`
2. `replace()` with a regular expression (`^\\s/g`)

**Options Compared:**

* `trim()`: A built-in JavaScript method that removes whitespace characters from the start and end of a string.
* `replace()` with regular expression (`^\\s/g`): A built-in JavaScript method that replaces occurrences of a pattern in a string. In this case, the pattern is one or more whitespace characters (`\\s`) at the start of the string (`^`), and the replacement value is an empty string (`''`).

**Pros and Cons:**

* `trim()`: Pros:
	+ Simple and efficient
	+ Works on most strings (including those with multiple consecutive whitespace characters)
* Cons:
	+ May not remove all whitespace characters, especially if they appear inside the string
	+ Can be slower than `replace()` for large strings
* `replace()` with regular expression (`^\\s/g`): Pros:
	+ More flexible and powerful than `trim()`, allowing for more complex pattern matching
	+ Can handle strings with multiple consecutive whitespace characters
* Cons:
	+ Requires more code to set up the regular expression pattern
	+ May be slower than `trim()` for simple cases

**Library Used:**
None. Both `trim()` and `replace()` are built-in JavaScript methods.

**Special JS Feature/Syntax:**
The test case uses the `g` flag in the `replace()` method, which stands for "global" and allows the replacement to occur on all occurrences of the pattern, not just the first one. This is a common feature used when working with regular expressions in JavaScript.

**Other Alternatives:**

* Other methods that can be used for string trimming in JavaScript include:
	+ `substring()` or `slice()`: These methods allow you to extract a subset of characters from the original string.
	+ A custom function using `String.prototype.replace()` with a regular expression
* Alternative approaches for comparing these two methods might include testing other string manipulation methods, such as `split()`, `join()`, or `concat()`.

trim vs replace (version: 0) Benchmark.js

Comparing performance of: `trime vs replace`

Created: 5 years ago by: Guest

Go to the latest result

trime

replace

Historical Performance Data aggregated from 11 community runs

Desktop Results:

Chrome 11 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

trim vs replace (version: 0) Benchmark.js

Comparing performance of: trime vs replace

Created: 5 years ago by: Guest

Go to the latest result

trime

replace

Historical Performance Data aggregated from 11 community runs

Desktop Results:

Chrome 11 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

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Comparing performance of: `trime vs replace`