Benchmark: string vs char comparison

Script Preparation code:

function isObjC(x){return (typeof x)[0] === 'o';}
function isObjS(x){return typeof x === 'object'}

Tests:

char
isObjC('foo');isObjC({});
string
isObjS('foo');isObjS({});

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
char
string

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):

LLMs can make mistakes. Check important info.

**Overview of the Benchmark**

The provided JSON represents a JavaScript microbenchmarking test, where users can create and run comparisons between different approaches to check performance. The benchmark in question compares two methods: `isObjC(x)` and `isObjS(x)`, which are used to determine whether a variable `x` is an object or not.

**Purpose of the Libraries Used**

* `isObjC(x)` uses a library function called `typeof x`. This function returns a string that describes the type of the variable, where:
	+ 'o' indicates an object
	+ 'n' indicates a number
	+ 's' indicates a string
	+ 'b' indicates a boolean
	+ etc.
* `isObjS(x)` uses the `typeof x === 'object'` method. This method returns `true` if the variable is an object, and `false` otherwise.

**Pros and Cons of Each Approach**

* `isObjC(x)`: 
	+ Pros:
		- More accurate for non-string objects (e.g., arrays, dates)
	+ Cons:
		- Returns a string value ('o' or 'n') that may not be immediately clear to developers
		- May be slower due to the additional function call
* `isObjS(x)`: 
	+ Pros:
		- More intuitive and readable for developers (it clearly returns `true` or `false`)
	+ Cons:
		- Less accurate for non-string objects

**Other Considerations**

* The benchmark uses a simple test case: a string and an object. This may not accurately represent real-world scenarios.
* The use of `typeof x` in `isObjC(x)` is a built-in JavaScript feature that can be useful in certain situations, but it's not as readable or maintainable as the `isObjS(x)` approach.

**Special JS Feature**

None mentioned. However, it's worth noting that `typeof x` has been around since ECMAScript 1 and is still widely used today.

**Alternative Approaches**

Other methods to check if a variable is an object could include:

* Using a library like Lodash's `isObject()` function
* Creating a custom function using a more complex regex pattern or bitwise operations
* Using a more modern approach with the `instanceof` operator (available in ECMAScript 2015+)

In general, for simple cases, `isObjS(x)` is a good choice. For more complex scenarios, using a library or a custom implementation may be necessary.

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.54 Safari/537.36

Browser/OS: Chrome 95 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
char	5766891.5 Ops/sec
string	6014497.0 Ops/sec

Related benchmarks:

string vs char comparison (version: 0)

Comparing performance of: char vs string

Created: 3 years ago by: Guest

Jump to the latest result

char

string

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):