Benchmark: slice vs substr vs substring (with start index 0)

Script Preparation code:

var example = 'there is no spoon'

Tests:

slice
var result = example.slice(0, 10)
substr
var result = example.substr(0, 10)
substring
var result = example.substring(0, 10)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
slice
substr
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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The provided JSON represents a JavaScript microbenchmarking test created on the MeasureThat.net platform. The goal of this benchmark is to compare the performance of three string slicing methods: `slice()`, `substr()`, and `substring()`.

**What are being tested?**

The tests measure the execution time of each method when slicing a string with a starting index of 0, using the same input string `"there is no spoon"`. The benchmark is designed to compare the performance of these methods in terms of speed and efficiency.

**Options compared:**

The three options being compared are:

1. `slice()`
2. `substr()`
3. `substring()`

Each method has its own strengths and weaknesses, which are discussed below.

**Pros and Cons:**

*   **`slice()`**: This method is generally considered the fastest of the three because it creates a new string object with the specified length and copies the corresponding characters from the original string. It also allows for more flexibility, as it returns an array-like object.
    *   Pros:
        *   Fastest execution time
        *   Allows for more flexible usage (e.g., returning an array-like object)
    *   Cons:
        *   Requires a new string object to be created and managed
*   **`substr()`**: This method is similar to `slice()`, but it returns only the specified length of characters from the original string. It does not create a new string object.
    *   Pros:
        *   Still relatively fast execution time
        *   Does not require creating a new string object
    *   Cons:
        *   Returns a substring, which might be less desirable than returning an array-like object
*   **`substring()`**: This method is similar to `substr()`, but it does not allow for the specified length parameter. It only returns the characters from the start index up to the end of the string.
    *   Pros:
        *   Does not require creating a new string object
        *   Can be more memory-efficient than `slice()` or `substr()`
    *   Cons:
        *   Returns a substring, which might be less desirable than returning an array-like object

**Libraries and Special JS Features:**

In the provided benchmark code, there are no libraries being used. The benchmark is purely relying on built-in JavaScript methods.

There are no special JavaScript features or syntaxes mentioned in this specific benchmark. However, some older browsers may require additional polyfills for certain string slicing methods.

**Other Alternatives:**

For string manipulation tasks, you might consider other alternatives such as:

*   Using a library like Lodash to provide more flexible and efficient string operations (e.g., `lodash.string.slice()` or `lodash.string.substr()`).
*   Utilizing specialized libraries designed specifically for performance-critical string operations, such as [String-Pool](https://github.com/mattmccotten/string-pool).
*   Implementing custom string manipulation functions to optimize performance according to your specific use case.

In conclusion, the benchmark provides a clear comparison of three common string slicing methods in JavaScript: `slice()`, `substr()`, and `substring()`. By analyzing these options and their pros and cons, developers can make informed decisions about which method best suits their needs.

Related benchmarks:

slice vs substr vs substring (with start index 0) (version: 0)

Compares slice, substr and substring to each other when the start index is 0

Comparing performance of: slice vs substr vs substring

Created: 4 years ago by: Guest

Jump to the latest result

slice

substr

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):