Benchmark: slice vs substr vs substring (with two args)

Script Preparation code:

var example = 'there is no spoon'

Tests:

slice
var result = example.slice(0, 2)
substr
var result = example.substr(0, 2)
substring
var result = example.substring(0, 2)

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:

No previous run results

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

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I'll break down the provided benchmark and explain what's being tested, compared, and their pros/cons.

**Benchmark Overview**

The given JSON represents a JavaScript microbenchmark that compares the performance of three string manipulation functions: `slice()`, `substr()`, and `substring()` when used with two arguments. The test case uses a predefined string "there is no spoon" as input.

**Test Case Comparison**

The benchmark consists of three individual test cases:

1. **Slice**: `var result = example.slice(0, 2)`
2. **Substr**: `var result = example.substr(0, 2)`
3. **Substring**: `var result = example.substring(0, 2)`

**Library and Purpose**

None of the test cases explicitly use a library.

**Special JavaScript Features/Syntax**

The benchmark does not mention any special JavaScript features or syntax.

**Performance Comparison**

The comparison is done by measuring the number of executions per second for each function. The results indicate that:

* `substring()` performs best ( highest executions per second)
* `substr()` has slightly slower performance compared to `substring()`
* `slice()` has the slowest performance among the three

**Pros and Cons**

Here's a brief analysis of the pros and cons of each approach:

1. **Substring**: Pros:
	* Often used in string manipulation, especially when working with regular expressions.
	* Can be more readable than other methods for extracting specific parts of a string.
Cons: None notable.
2. **Substr**: Pros:
	+ More concise than `substring()` or `slice()`.
	+ Can be faster due to fewer overheads (less error checking, etc.)
Cons:
	+ Not as readable as `substring()` or `slice()`, especially for non-JavaScript developers.
	+ Can throw errors if the input string is not provided with two arguments.
3. **Slice**: Pros: None notable.
Cons:
	* Less readable than other methods for extracting specific parts of a string.
	* May have slower performance due to more overheads.

**Other Alternatives**

If you needed to compare these functions, here are some alternative approaches:

1. Use `slice()` and `substring()`: If you want to prioritize readability over raw speed, using `substring()` might be a better choice.
2. Use `substr()`: If you need to extract specific parts of a string frequently, using `substr()` can be faster due to its concise syntax.
3. Use regular expressions: Instead of manipulating strings with these methods, consider using regular expressions for more efficient and flexible pattern matching.

Keep in mind that the actual performance differences between these functions are relatively small, so it's essential to prioritize code readability and maintainability over minor performance optimizations unless performance is a critical concern.

Related benchmarks:

slice vs substr vs substring (with two args) (version: 0)

Compares slice, substr and substring to each other when there are two args

Comparing performance of: slice vs substr vs substring

Created: 5 years ago by: Registered User

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):