Benchmark: slice vs substr vs substring (with no end index) 22

Script Preparation code:

var example = 'there is no spoon'

Tests:

slice
var result = example.slice(5, str.lenght)
substr
var result = example.substr(5, str.lenght)
substring
var result = example.substring(5, str.lenght)
replace
var result = example.replace('there', '')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
slice
substr
substring
replace

Fastest: N/A

Slowest: N/A

Latest run results:

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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 and explain what's being tested.

**What is being tested?**

The benchmark is comparing three string manipulation methods in JavaScript: `slice()`, `substr()`, and `substring()` (with no end index). The test cases are designed to measure which method is fastest for a specific use case: removing a fixed-length substring from a given string.

**Options compared**

The options being compared are:

1. `slice(start, length)`
2. `substr(start, length)`
3. `substring(start)`

Each of these methods has its own strengths and weaknesses:

* `slice()`: This method is generally faster and more efficient than the other two because it doesn't require the browser to handle the case where the start index is greater than or equal to the string length. However, it returns a new string object, which can be slower for very large strings.
* `substr()`: This method was introduced in ECMAScript 5 (ES5) and is still supported in modern browsers. It's similar to `slice()` but has some differences. In this benchmark, the `substr` test case returns an empty string when executed, which might indicate a problem with the test setup.
* `substring()`: This method was also introduced in ES5 and is used for substrings starting at index 0. When used without an end index (as in the benchmark), it will return the substring from the start index to the end of the string.

**Pros and Cons**

Here are some pros and cons for each method:

* `slice()`: Pros: faster, more efficient; Cons: returns a new string object.
* `substr()`: Pros: none apparent; Cons: might be problematic due to the test case returning an empty string, which could indicate a problem with the benchmark setup.
* `substring()`: Pros: none apparent; Cons: will return the substring from the start index to the end of the string when used without an end index.

**Other considerations**

The benchmark uses the `replace()` method as a control group, but it's not clear why this is being included in the comparison. The `replace()` method might be expected to perform well due to its simplicity and efficiency, but its inclusion could skew the results if there are issues with the test setup.

**Library usage**

There is no explicit library usage mentioned in the benchmark definition or test cases. However, it's worth noting that some browsers may have specific optimizations or implementations for string manipulation methods that could affect the benchmark results.

No special JavaScript features or syntax are being tested in this benchmark.

**Alternatives**

If you were to create a similar benchmark using a different approach, here are some alternatives:

* Compare `slice()`, `substr()`, and `substring()` with other string manipulation methods like `indexOf()`, `lastIndexOf()`, or regular expressions.
* Test the performance of different programming languages or frameworks that support JavaScript for this type of benchmark (e.g., Node.js, browser-based JavaScript engines).
* Create a more comprehensive benchmark by adding additional test cases, such as comparing these methods with other string manipulation techniques like concatenation or using `split()` and `join()`.

Related benchmarks:

slice vs substr vs substring (with no end index) 22 (version: 0)

Compares slice, substr and substring to each other when there is only a start index

Comparing performance of: slice vs substr vs substring vs replace

Created: 5 years ago by: Guest

Jump to the latest result

slice

substr

substring

replace

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):