Benchmark: String primitive operation vs String object operation

Script Preparation code:

var prim = "Hello";
var obj = new String("Hello");

Tests:

String primitive operation
prim.indexOf("Hello");
String object operation
obj.indexOf("Hello");

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
String primitive operation
String object operation

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):

LLMs can make mistakes. Check important info.

Let's dive into the explanation of the provided benchmark.

**Benchmark Overview**

The benchmark compares the performance of two approaches: using a string primitive versus using a string object in JavaScript. The test cases focus on the `indexOf()` method, which searches for a specified substring within a string.

**Options Compared**

The benchmark tests two options:

1. **String Primitive Operation**: This approach uses a simple string literal (`"Hello"`).
2. **String Object Operation**: This approach creates a new string object using the `new String()` constructor and assigns it to a variable (`var obj = new String("Hello");`).

**Pros and Cons**

* **String Primitive Operation**:
	+ Pros: Typically faster, as it involves a simple operation on the primitive value.
	+ Cons: May not provide more control or flexibility for certain operations, such as concatenation or substring extraction with specified start and end indices.
* **String Object Operation**:
	+ Pros: Provides more control and flexibility, especially when working with complex string manipulation tasks. The `new String()` constructor allows for creating a new instance with specific properties (e.g., encoding) that may be relevant to the application.
	+ Cons: Generally slower due to the overhead of creating a new object instance.

**Library Usage**

There is no explicit library usage in this benchmark, but it's worth noting that some modern JavaScript engines, like V8 (used by Google Chrome and Node.js), have optimized string manipulation operations using various techniques, such as caching and avoiding unnecessary allocations. However, the basic `indexOf()` method remains a simple, lightweight operation.

**Special JS Features/Syntax**

There are no special JavaScript features or syntax highlighted in this benchmark. The focus is solely on comparing two approaches to string manipulation using the built-in `indexOf()` method.

**Other Alternatives**

If you're interested in exploring other alternatives for string manipulation or benchmarking, some options include:

* Using a library like Lodash, which provides a range of utility functions for working with strings and arrays.
* Implementing custom string manipulation functions, such as a simple regex engine or a substring extraction function.
* Utilizing WebAssembly (WASM) or other compiler-generated code to optimize performance-critical operations.

Keep in mind that the choice of approach depends on the specific requirements of your project, including factors like performance, flexibility, and maintainability.

Latest run results:

Run details: (Test run date: 7 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:53.0) Gecko/20100101 Firefox/53.0

Browser/OS: Firefox 53 on Windows

View result in a separate tab

Test name	Executions per second
String primitive operation	27464924.0 Ops/sec
String object operation	8269317.0 Ops/sec

Related benchmarks:

String primitive operation vs String object operation (version: 0)

Comparing performance of: String primitive operation vs String object operation

Created: 7 years ago by: Guest

Jump to the latest result

String primitive operation

String object operation

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):