Benchmark: string map vs. for search small arr

Script Preparation code:

globalThis.map = []
globalThis.objArr = []

for (let i = 0; i < 20; i++) {
    map[`thing-${i}`] = { i }
    objArr.push({ i })
}

Tests:

string map
const v = map['thing-5']; console.log(v) delete map['thing-5'];
find
for (let i = objArr.length - 1; i >= 0; i--) { const v = objArr[i] if (v.i === 5) { objArr.splice(i, 1) console.log(v) return v } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
string map
find

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser/OS: Chrome 131 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
string map	458648.8 Ops/sec
find	26188316.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested, compared options, pros and cons, and other considerations.

**Benchmark Overview**

The provided JSON represents a JavaScript microbenchmark test case, specifically designed to compare two approaches for searching small arrays:

1. String mapping (using `map` object)
2. Array iteration (using `for` loop)

**Script Preparation Code**

The script preparation code sets up the necessary variables and data structures:

* `globalThis.map` is initialized as an empty array.
* `globalThis.objArr` is initialized as an empty array.
* The array `objArr` is populated with 20 objects, each containing a unique `i` property.

**Html Preparation Code**

There is no HTML preparation code provided in this case.

**Individual Test Cases**

The benchmark consists of two test cases:

1. **String Map**
```javascript
const v = map['thing-5'];
console.log(v);
delete map['thing-5'];
```
This test case uses the `map` object to search for an element with a specific key (`'thing-5'`) and logs its value.

2. **Find**
```javascript
for (let i = objArr.length - 1; i >= 0; i--) {
  const v = objArr[i];

if (v.i === 5) {
    objArr.splice(i, 1);

console.log(v);
    return v;
  }
}
```
This test case uses a `for` loop to iterate through the array `objArr` in reverse order and finds the first element with an `i` property equal to 5. If found, it logs the value, removes the element from the array using `splice`, and exits the loop.

**Benchmark Comparison**

The benchmark compares the performance of these two approaches:

1. String mapping (using `map` object)
2. Array iteration (using `for` loop)

**Pros and Cons:**

* **String Mapping:**
	+ Pros:
		- Fast lookups using hash tables.
		- Easy to implement.
	+ Cons:
		- May not be suitable for large datasets or complex data structures.
		- Can lead to memory issues if the `map` object grows too large.
* **Array Iteration:**
	+ Pros:
		- Suitable for large datasets and complex data structures.
		- Allows for easy iteration and manipulation of elements.
	+ Cons:
		- May be slower than string mapping for small datasets.
		- Requires more code to implement.

**Library/Utility:**

In the provided benchmark, there is no explicit library or utility being used. However, `globalThis.map` is a common notation for initializing a global object (in this case, an array).

**Special JS Feature/Syntax:**

There are no special JavaScript features or syntax being utilized in this benchmark.

**Other Considerations:**

When designing and running benchmarks like this one, it's essential to consider the following:

* Use relevant unit tests and microbenchmarks to evaluate specific performance characteristics.
* Ensure that the test cases are representative of real-world scenarios.
* Run the benchmarks on multiple devices, browsers, and platforms to account for variations in performance.
* Consider using benchmarking frameworks like Benchmark.js or Microbenchmark to simplify the process.

**Alternatives:**

For similar benchmarking needs, consider using:

* Benchmark.js (a popular benchmarking framework)
* Microbenchmark (a lightweight benchmarking library)
* V8 Benchmark (for Chrome-specific benchmarks)

Note that these alternatives might require additional setup and configuration to match the specific requirements of your project.

Related benchmarks:

string map vs. for search small arr (version: 0)

Comparing performance of: string map vs find

Created: 3 years ago by: Guest

Jump to the latest result

string map

find

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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