Benchmark: substring vs substr vs slice

Tests:

substring
"0123456789".substring(9);
substr
"0123456789".substr(9);
slice
"0123456789".slice(-1);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
substring
substr
slice

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.1:latest, generated 27 days ago):

LLMs can make mistakes. Check important info.

Let's break down the benchmark.

**What is being tested?**

The benchmark is comparing three different JavaScript methods for extracting a substring from a string:

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

These methods are used to extract a part of a string, but they have slightly different behavior and performance characteristics.

**Description of options:**

### 1. `substring()` method

The `substring()` method is used to extract a part of a string between two specified indices. The syntax is:

`str.substring(startIndex, endIndex)`

In the test case, it's used as: `"0123456789".substring(9);`

This method returns a new string that includes all characters from `startIndex` to `endIndex-1`.

**Pros:** Easy to use and understand.

**Cons:** Can be slower than other methods for large strings or frequent calls.

### 2. `substr()` method

The `substr()` method is similar to `substring()`, but it returns a substring starting at the specified index, until the end of the string. The syntax is:

`str.substr(startIndex)`

In the test case, it's used as: `"0123456789".substr(9);`

This method returns a new string that includes all characters from `startIndex` to the end of the original string.

**Pros:** Can be faster than `substring()` for large strings or frequent calls.

**Cons:** Less intuitive and less widely supported (although it's still supported in modern browsers).

### 3. `slice()` method

The `slice()` method is used to extract a part of an array or a string, starting at the specified index. The syntax is:

`str.slice(startIndex)`

In the test case, it's used as: `"0123456789".slice(-1);`

This method returns a new array or string that includes all characters from `startIndex` to the end of the original string.

**Pros:** Can be faster than `substring()` and `substr()` for large strings or frequent calls.

**Cons:** Less intuitive and less widely supported (although it's still supported in modern browsers).

**Library and special JS feature:**

None in this test case. The methods being tested are native JavaScript methods.

**Other alternatives:**

1. **Using a library like Lodash**: If you need to perform complex string manipulations, consider using a library like Lodash, which provides a wide range of utility functions, including ones for string manipulation.
2. **Using regular expressions (regex)**: Regex can be used to extract substrings from strings, but it's generally slower and more complex than the methods being tested here.

**Considerations:**

When choosing between these methods, consider the following:

1. **Performance**: If you're performing frequent or large-scale string manipulations, `slice()` might be a good choice.
2. **Code readability**: If you prioritize code readability and simplicity, `substring()` is likely the best choice.
3. **Browser compatibility**: If you need to support older browsers, consider using `substr()`, as it's still supported in modern browsers.

That's a summary of the benchmark!

Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.113 Safari/537.36

Browser/OS: Chrome 81 on Windows

View result in a separate tab

Test name	Executions per second
substring	1050655424.0 Ops/sec
substr	1049885824.0 Ops/sec
slice	1049085376.0 Ops/sec

Related benchmarks:

substring vs substr vs slice (version: 0)

Comparing performance of: substring vs substr vs slice

Created: 4 years ago by: Registered User

Jump to the latest result

substring

substr

slice

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.1:latest, generated 27 days ago):