Benchmark: WeakMap vs Symbol Property 900

Script Preparation code:

var to0 = {};
var to1 = {};
var wm = new WeakMap();
var sy = Symbol();
wm.set(to1, 1);
to1[sy] = 1;

AخA
 
var to0 = {};var to1 = {};var wm = new WeakMap();var sy = Symbol();wm.set(to1, 1);to1[sy] = 1;

Tests:

WeakMap set
for(let i=900;--i;) wm.set(to0, 1);
for(let i=900;--i;) wm.set(to0, 1);
Symbol Property set
for(let i=900;--i;) to0[sy] = 1;
for(let i=900;--i;) to0[sy] = 1;
WeakMap get
for(let i=900;--i;) {let r = wm.get(to1);}
for(let i=900;--i;) {let r = wm.get(to1);}
Symbol Property get
for(let i=900;--i;) {let r = to1[sy];}
for(let i=900;--i;) {let r = to1[sy];}

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Experimental features:

Memory measurements supported only in Chrome.
For precise memory measurements Chrome must be launched with --enable-precise-memory-info flag.
More information: Monitoring JavaScript Memory

Test case name	Result
WeakMap set
Symbol Property set
WeakMap get
Symbol Property get

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/120.0.0.0 Safari/537.36

Browser/OS: Chrome 120 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
WeakMap set	16791.4 Ops/sec
Symbol Property set	18412.7 Ops/sec
WeakMap get	16242.6 Ops/sec
Symbol Property get	18481.1 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

Let's dive into the benchmark and explain what's being tested.

Benchmark Context

The benchmark measures the performance of two different approaches: using WeakMap (a built-in JavaScript object that stores mappings of keys to values, with the key being an object that can be garbage collected) and using a symbol property (a unique identifier for an object's property).

Options Compared

In this benchmark, we have four test cases:

WeakMap set: This test case measures the performance of setting a value in WeakMap.
Symbol Property set: This test case measures the performance of setting a value using a symbol property.
WeakMap get: This test case measures the performance of getting a value from WeakMap.
Symbol Property get: This test case measures the performance of getting a value using a symbol property.

Pros and Cons

WeakMap:
- Pros: Efficient use of memory, garbage collection, and reduced overhead.
- Cons: May not be suitable for use cases that require direct access to underlying data.
Symbol Property:
- Pros: Allows for fine-grained control over property access, can be used in conjunction with other features like getters and setters.
- Cons: May introduce additional overhead due to symbol creation and resolution.

Library and Purpose

In this benchmark, we don't have a specific library being used. However, WeakMap is a built-in JavaScript object that provides an efficient way to store mappings of keys to values.

Special JS Feature or Syntax

The use of symbols (sy) in the benchmark introduces a special feature in JavaScript: symbol properties. Symbols are unique identifiers for objects' properties and provide an alternative to string-based property names.

In this benchmark, symbols are used as property names to measure their performance compared to WeakMap.

Other Considerations

Garbage Collection: The use of WeakMap relies on garbage collection to manage the keys and values. This can lead to unpredictable behavior if the system is under memory pressure.
Overhead: Both WeakMap and symbol properties introduce some overhead due to their creation and resolution.

Alternatives

If you need to measure performance for other use cases, consider alternatives like:

Using a different data structure, such as an object or an array.
Implementing your own data structure or cache.
Measuring the performance of alternative programming languages or frameworks.

LLMs can make mistakes. Check important info.

Let's dive into the benchmark and explain what's being tested.

**Benchmark Context**

The benchmark measures the performance of two different approaches: using `WeakMap` (a built-in JavaScript object that stores mappings of keys to values, with the key being an object that can be garbage collected) and using a symbol property (a unique identifier for an object's property).

**Options Compared**

In this benchmark, we have four test cases:

1. **WeakMap set**: This test case measures the performance of setting a value in `WeakMap`.
2. **Symbol Property set**: This test case measures the performance of setting a value using a symbol property.
3. **WeakMap get**: This test case measures the performance of getting a value from `WeakMap`.
4. **Symbol Property get**: This test case measures the performance of getting a value using a symbol property.

**Pros and Cons**

* **WeakMap**:
	+ Pros: Efficient use of memory, garbage collection, and reduced overhead.
	+ Cons: May not be suitable for use cases that require direct access to underlying data.
* **Symbol Property**:
	+ Pros: Allows for fine-grained control over property access, can be used in conjunction with other features like getters and setters.
	+ Cons: May introduce additional overhead due to symbol creation and resolution.

**Library and Purpose**

In this benchmark, we don't have a specific library being used. However, `WeakMap` is a built-in JavaScript object that provides an efficient way to store mappings of keys to values.

**Special JS Feature or Syntax**

The use of symbols (`sy`) in the benchmark introduces a special feature in JavaScript: symbol properties. Symbols are unique identifiers for objects' properties and provide an alternative to string-based property names.

In this benchmark, symbols are used as property names to measure their performance compared to `WeakMap`.

**Other Considerations**

* **Garbage Collection**: The use of `WeakMap` relies on garbage collection to manage the keys and values. This can lead to unpredictable behavior if the system is under memory pressure.
* **Overhead**: Both `WeakMap` and symbol properties introduce some overhead due to their creation and resolution.

**Alternatives**

If you need to measure performance for other use cases, consider alternatives like:

* Using a different data structure, such as an object or an array.
* Implementing your own data structure or cache.
* Measuring the performance of alternative programming languages or frameworks.

Related benchmarks:

WeakMap vs Symbol Property 900 (version: 0)

Comparing performance of: WeakMap set vs Symbol Property set vs WeakMap get vs Symbol Property get

Created: one year ago by: Guest

Jump to the latest result

WeakMap set

Symbol Property set

WeakMap get

Symbol Property get

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):