Benchmark: Performance Test: substring vs substr (remove last 10 chars)

Script Preparation code:

var string = "I am the god of hellfire, and I bring you..."

Tests:

slice
var substring = string.slice(0, -10);
substring
var substring = string.substring(0, string.length - 10);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
slice
substring

Fastest: N/A

Slowest: N/A

Latest run results:

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

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

**Benchmark Definition**

The benchmark defines two test cases: `slice` and `substring`. Both tests aim to measure the performance of removing the last 10 characters from a string using different methods.

**Options Compared**

There are two options compared:

1. **`string.slice(0, -10)`**: This method uses the `slice()` function to extract a subset of characters from the original string. The `-10` argument specifies the starting index (0-based), and the second argument `-10` specifies the length of the substring (i.e., 10 characters from the end).
2. **`string.substring(0, string.length - 10)`**: This method uses the `substring()` function to extract a substring from the original string. The first argument `0` specifies the starting index (0-based), and the second argument `string.length - 10` specifies the length of the substring.

**Pros and Cons**

**`slice()` approach:**

Pros:

* More concise and readable code
* Less chance of errors due to integer overflows

Cons:

* May not work correctly for negative indices or non-integer values
* Can be slower than `substring()` in some browsers

**`substring()` approach:**

Pros:

* Works with both positive and negative indices, as well as non-integer values
* More flexible, but may lead to errors if not used carefully

Cons:

* Less readable code
* May incur integer overflow issues when using large indices or substring lengths

**Other Considerations**

Both methods are generally accepted as valid ways to remove the last 10 characters from a string in JavaScript. However, it's worth noting that some older browsers may not support the `slice()` method.

**Library and Special JS Features**

Neither of these test cases uses any libraries or special JavaScript features beyond what is built-in to the language.

**Other Alternatives**

If you're looking for alternative ways to remove the last 10 characters from a string, here are some other approaches:

* Using `String.prototype.replace()` with a regular expression: `string.replace(/.*$/, '')`
* Using `String.prototype.slice()` with a negative index: `string.slice(-10)`
* Using a library like Lodash or Underscore.js to remove the last 10 characters

Keep in mind that these alternatives may have slightly different performance characteristics, readability, and reliability compared to the original test cases.

Related benchmarks:

Performance Test: substring vs substr (remove last 10 chars) (version: 0)

Comparing performance of: slice vs substring

Created: 3 years ago by: Guest

Jump to the latest result

slice

substring

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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