Benchmark: string empty literal vs length

Tests:

eq empty string literal
function isEmpty(string) { return string === ''; } const text = 'This is an example of a non empty string'; const empty = ''; const test1 = isEmpty(text); const test2 = isEmpty(empty);
length is 0
function isEmpty(string) { return string.length === 0; } const text = 'This is an example of a non empty string'; const empty = ''; const test1 = isEmpty(text); const test2 = isEmpty(empty);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
eq empty string literal
length is 0

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested.

**Benchmark Purpose:**
The purpose of this benchmark is to compare two different approaches to check if a string is empty:

1. Using the `===` operator with an empty string literal (`''`)
2. Using the `length` property to check if the length of the string is 0

**Options Compared:**

* **Option 1:** `string === ''`
	+ Pros:
		- Simple and concise
		- Directly checks for equality between the string and an empty string literal
	+ Cons:
		- Can be slower due to the implicit conversion of the string to a number
		- May not perform well on modern browsers that optimize this comparison
* **Option 2:** `string.length === 0`
	+ Pros:
		- Faster, as it only needs to access the length property once
		- More accurate, as it avoids potential issues with string conversion
	+ Cons:
		- Less readable and more verbose than Option 1

**Library and Special JS Features:**
There are no libraries mentioned in the benchmark definition or test cases. However, it's worth noting that both `===` and `length` properties are built-in JavaScript features.

No special JS features or syntax are used in this benchmark.

**Other Alternatives:**
If you're interested in alternative approaches to check if a string is empty, here are a few options:

* Using the `trim()` method followed by checking for an empty result: `string.trim() === ''`
* Using a regex pattern that matches zero-length strings: `/^$/` (note that this approach may not work correctly in all browsers)
* Using a library like Lodash or Underscore.js, which provide utilities for working with strings.

Keep in mind that these alternatives might have different performance characteristics and might not be as optimized as the two approaches being compared in this benchmark.

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:109.0) Gecko/20100101 Firefox/111.0

Browser/OS: Firefox 111 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
eq empty string literal	1570364416.0 Ops/sec
length is 0	1581715968.0 Ops/sec

Related benchmarks:

string empty literal vs length (version: 0)

Different ways of checking if string is empty

Comparing performance of: eq empty string literal vs length is 0

Created: one year ago by: Guest

Jump to the latest result

eq empty string literal

length is 0

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):