Benchmark: Map iteration for vs while cached

Script Preparation code:

var obj = {
  a: 1,
  b: 2,
  c: 3,
  d: 4,
  e: 5,
  f: 6,
  g: 7,
  h: 8,
  i: 9,
  j: 10,
  k: 11,
  l: 12,
  m: 13,
  n: 14,
  o: 15,
  p: 16,
  q: 17,
  r: 18,
  s: 19,
  t: 20,
  u: 21,
  v: 22,
  w: 23,
  x: 24,
  y: 25,
  z: 26
};
var map = new Map(Object.entries(obj));

Tests:

Map - for of kv
for (const [key, value] of map) { console.log(key, value); }
Map - while cached
let k = map.keys(); let l = map.size; let i = 0; while (i<l) { let kk = k.next().value; console.log(kk , map.get(kk)); i++; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Map - for of kv
Map - while cached

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.0.0 Safari/537.36

Browser/OS: Chrome 109 on Linux

View result in a separate tab

Test name	Executions per second
Map - for of kv	9723.4 Ops/sec
Map - while cached	9538.6 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the explanation of the provided benchmark definition, test cases, and their respective options.

**Benchmark Definition:**
The benchmark measures two approaches for iterating over a Map data structure in JavaScript:

1. **For...of loop**: This approach uses the `for...of` loop to iterate over the key-value pairs of the Map.
2. **While cached loop**: This approach uses a while loop with caching to access the values from the Map.

**Options compared:**
The two options being compared are:

* For...of loop
* While cached loop

These two approaches have different execution patterns and can be optimized in different ways.

**Pros and Cons of each approach:**

* **For...of loop**: This approach is generally more efficient because it allows the JavaScript engine to optimize the iteration process internally. However, it may not work well with very large datasets.
* **While cached loop**: This approach uses caching to access the values from the Map, which can lead to better performance for certain use cases. However, it requires manual management of the cache and can be more error-prone.

**Library used:**
The benchmark script uses the built-in `Map` data structure in JavaScript, which is part of the ECMAScript standard.

**Special JS feature or syntax:**
There are no special features or syntaxes mentioned in the benchmark definition. The tests focus on comparing two basic iteration approaches using the Map data structure.

**Other considerations:**

* **Cache size**: The while cached loop uses caching to access values from the Map. However, the cache size is not explicitly defined in the benchmark script.
* **Memory allocation**: Creating a new Map instance may incur some memory overhead, which should be considered when running these benchmarks on small or embedded devices.

**Other alternatives:**

* **Using other data structures**: Instead of using a Map, you could use an array or object to store key-value pairs. This might change the iteration approach and performance characteristics.
* **Using parallel processing**: If multiple CPU cores are available, you can try running the benchmarks in parallel using techniques like parallel processing or multi-threading.
* **Optimizing the JavaScript engine**: Depending on the target browser or version, there may be opportunities to optimize the JavaScript engine's behavior for Map iteration.

In summary, the benchmark measures two approaches for iterating over a Map data structure: for...of loop and while cached loop. The pros and cons of each approach are discussed, along with considerations for cache size, memory allocation, and alternative iterations using other data structures or parallel processing.

Related benchmarks:

Map iteration for vs while cached (version: 0)

Comparing performance of: Map - for of kv vs Map - while cached

Created: 2 years ago by: Guest

Jump to the latest result

Map - for of kv

Map - while cached

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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