Benchmark: test Javascript string.endsWith vs string.slice and tripple equal

Script Preparation code:

const value = "/root/test/a/b/c/"
const ending = "/"

function compareEndsWith(val, comparator) {
  return val.endsWith(comparator)
}
function compareSliceMethod(val, comparator) {
  const thingToCompare = val.slice(-comparator.length)
  return thingToCompare === comparator
}

Tests:

endWith
const value = "/root/test/a/b/c/" const ending = "/" compareEndsWith(value, ending)
slice
const value = "/root/test/a/b/c/" const ending = "/" compareSliceMethod(value, ending)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
endWith
slice

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 9 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36

Browser/OS: Chrome 138 on Windows

View result in a separate tab

Test name	Executions per second
endWith	202939184.0 Ops/sec
slice	133551072.0 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 on MeasureThat.net.

The provided JSON represents two test cases: `endWith` and `slice`. Both tests aim to measure the performance difference between using the `endsWith()` method versus the `slice()` method in conjunction with triple equals (`===`) for a specific string comparison scenario.

**What is tested?**

In both cases, a string `value` is defined as `/root/test/a/b/c/`, and another string `ending` is defined as `/`. The tests compare these two strings using:

1. **endsWith() method**: This method checks if the end of the string (`value`) matches the specified ending string (`ending`). It returns a boolean value indicating whether the end of the string matches.
2. **slice() method with triple equals (===)**: This approach uses the `slice()` method to extract the last characters from the `value` string, and then compares that extracted substring to the `ending` string using triple equals (`===`). If they match, it returns true.

**Options compared**

The two options being compared are:

* **endsWith() method**
* **slice() method with triple equals (===)**

**Pros and Cons:**

1. **endsWith() method**:
	* Pros: Efficient, as it only checks the end of the string, making it a good choice for most use cases.
	* Cons: Might not be suitable when you need to check multiple characters at the end of the string, or when working with strings that don't have a defined length (e.g., null or undefined).
2. **slice() method with triple equals (===)**:
	* Pros: Flexible, as it allows for any number of characters to be compared at the end of the string.
	* Cons: Less efficient than `endsWith()` due to the additional operations involved in extracting and comparing substrings.

**Library usage**

There is no explicit library mentioned in the provided code. However, some modern JavaScript engines and browsers include built-in support for string methods like `endsWith()` and `slice()`. If you were to use a third-party library, it might offer additional functionality or optimizations for these operations.

**Special JS feature or syntax**

There are no special features or syntax mentioned in the provided code that would require specific handling or explanation.

**Alternative approaches**

If you're interested in exploring other alternatives, here are a few:

* **Regex-based approach**: Instead of using `endsWith()` or `slice()`, you could use regular expressions to match the ending string. This might be more efficient for certain scenarios but can lead to more complex code.
* **Using a custom implementation**: You could implement your own custom solution for comparing strings, potentially leveraging browser-specific optimizations or native methods like `compareString()` (available in older browsers).

For most use cases, sticking with built-in methods like `endsWith()` and `slice()` should be sufficient. However, understanding the trade-offs and considering alternative approaches can help you make informed decisions when working with JavaScript string comparisons.

Related benchmarks:

test Javascript string.endsWith vs string.slice and tripple equal (version: 0)

Comparing performance of: endWith vs slice

Created: 3 years ago by: Guest

Jump to the latest result

endWith

slice

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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