Benchmark: es6 map access with string vs symbol keys

Script Preparation code:

var eightSymbol = Symbol("eight")

var mapStringKeys = new Map([["one", true], ["two", true], ["three", true], ["four", true], ["five", true], ["six", true], ["seven", true], ["eight", true], ["nine", true], ["ten", true]]);
var mapStringAndSymbolKeys = new Map([["one", true], [Symbol("two"), true], ["three", true], [Symbol("four"), true], ["five", true], [Symbol("six"), true], ["seven", true], [eightSymbol, true], ["nine", true], [Symbol("ten"), true]]);

Tests:

Get string key from map with only string keys
var value = mapStringKeys.get('eight');
Get symbol key from map with mixed string and symbol keys
var value = mapStringAndSymbolKeys.get(eightSymbol);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Get string key from map with only string keys
Get symbol key from map with mixed string and symbol keys

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):

LLMs can make mistakes. Check important info.

The provided JSON represents a JavaScript microbenchmark on measuring the performance of accessing elements in a Map data structure using different types of keys: strings and symbols.

In this benchmark, two test cases are defined:

1. **Get string key from map with only string keys**: This test case accesses an element in the `mapStringKeys` Map using a string key `'eight'`. The goal is to measure how fast the JavaScript engine can retrieve an element by its key.
2. **Get symbol key from map with mixed string and symbol keys**: This test case accesses an element in the `mapStringAndSymbolKeys` Map using a symbol key `eightSymbol`. The goal is to measure how fast the JavaScript engine can retrieve an element by its symbol key.

The benchmark uses two Maps: `mapStringKeys` and `mapStringAndSymbolKeys`. The former contains only string keys, while the latter contains both string and symbol keys. This allows the benchmark to compare the performance of accessing elements using different types of keys.

**Options compared:**

1. **String keys**: The benchmark compares the performance of accessing elements in a Map using only string keys.
2. **Symbol keys**: The benchmark compares the performance of accessing elements in a Map using symbol keys.

**Pros and Cons of each approach:**

* Using **string keys**:
	+ Pros: Most developers are familiar with string keys, making it easier to write code that works with them.
	+ Cons: String keys can lead to slower lookup times compared to symbol keys due to the additional overhead of converting strings to symbols.
* Using **symbol keys**:
	+ Pros: Symbol keys provide faster lookup times than string keys because they are hashed and looked up more efficiently by the JavaScript engine.
	+ Cons: Symbol keys are less familiar to developers, requiring additional effort to write code that works with them.

**Other considerations:**

* The benchmark does not account for other factors that might affect performance, such as the size of the Map or the complexity of the code accessing its elements.
* The benchmark is focused on measuring the performance of accessing a single element in the Map, which may not be representative of real-world scenarios where Maps are used extensively.

**Library:**

There is no explicit library mentioned in the provided JSON. However, it's worth noting that the `Symbol` data type is a built-in JavaScript feature introduced in ECMAScript 2015 (ES6).

**Special JS features or syntax:**

No special JavaScript features or syntax are highlighted in this benchmark.

Overall, this benchmark provides a useful comparison of accessing elements in a Map using different types of keys and can be used to measure the performance of your JavaScript engine or browser.

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/112.0.0.0 Safari/537.36

Browser/OS: Chrome 112 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Get string key from map with only string keys	18043844.0 Ops/sec
Get symbol key from map with mixed string and symbol keys	7964398.0 Ops/sec

Related benchmarks:

es6 map access with string vs symbol keys (version: 0)

Comparing performance of: Get string key from map with only string keys vs Get symbol key from map with mixed string and symbol keys

Created: 2 years ago by: Guest

Jump to the latest result

Get string key from map with only string keys

Get symbol key from map with mixed string and symbol keys

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):