Benchmark: Javascript: toLowerCase vs equality ===

Script Preparation code:

var a = "John Doe"
var b = "john doe"
var c = "john smith"
var o = {
    sensitivity: 'base'
}

Tests:

toLowerCase()
a.toLowerCase() === b.toLowerCase()
sensitive
a === b

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
toLowerCase()
sensitive

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 11 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36 Edg/136.0.0.0

Browser/OS: Chrome 136 on Windows

View result in a separate tab

Test name	Executions per second
toLowerCase()	211943440.0 Ops/sec
sensitive	220198544.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks.

**What is tested?**

The provided benchmark measures the performance difference between two approaches:

1. Converting strings to lowercase using `toLowerCase()` (Test Case 1).
2. Comparing two strings for equality (`===`) without converting them to lowercase (Test Case 2).

**Options compared:**

In Test Case 1, the options being compared are:

* `toLowerCase()`: a method that converts a string to lowercase.
* Equality comparison (`===`) without any transformations.

In Test Case 2, the options being compared are:

* Equality comparison (`===`) with case sensitivity preserved.
* Equality comparison (`===`) without any transformations (similar to Test Case 1).

**Pros and Cons of each approach:**

**toLowerCase() (Test Case 1)**

Pros:

* Can be faster because it reduces the number of characters that need to be compared.
* Avoids potential collisions between similar but different strings.

Cons:

* Requires additional function call overhead.
* May not preserve case sensitivity if used in a context where case preservation is important.

**Equality comparison (`===`) without transformations (Test Case 2)**

Pros:

* Preserves case sensitivity, which can be important for certain applications.
* Does not require an additional function call.

Cons:

* Can be slower because it requires comparing more characters.

**Other considerations:**

* The use of a sensitive string ("john doe") in the script preparation code may affect the results. This is likely due to the fact that some browsers or implementations may handle case-insensitive comparison differently.
* The presence of an object (`var o = { ... }`) with a `sensitivity` property can also impact the results, as it may cause the browser to optimize certain operations based on this value.

**Library and purpose:**

The benchmark uses no external libraries. However, it relies on the built-in JavaScript functionality for string manipulation and comparison.

**Special JS feature or syntax:**

None of the test cases use special JavaScript features or syntax beyond what is standard in the language.

Now, let's look at some alternatives:

* Other benchmarking frameworks like WebPageTest, BrowserBench, or Google Benchmark can also be used to compare performance.
* Custom benchmarks written in a specific programming language (e.g., Python) can also be used for comparison.

Keep in mind that different frameworks and approaches may have varying results due to differences in test setup, execution environments, and optimization strategies.

Related benchmarks:

Javascript: toLowerCase vs equality === (version: 0)

Comparing performance of: toLowerCase() vs sensitive

Created: 3 years ago by: Guest

Jump to the latest result

toLowerCase()

sensitive

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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