Benchmark: Key lookup using different methods.

Script Preparation code:

var myObj = {
    one: 1,
    two: 2,
    three: 3
}
var keys = Object.keys(myObj)
var myMap = new Map(Object.entries(myObj))

Tests:

Without conversion
Object.hasOwnProperty(myObj, "two")
Pre-converted Array
keys.includes("two")
Pre-converted Map
myMap.has("two")
Live conversion to Array
Object.keys(myObj).includes("two")
Live convesion to Map
new Map(Object.entries(myObj)).has("two")

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Without conversion
Pre-converted Array
Pre-converted Map
Live conversion to Array
Live convesion to Map

Fastest: N/A

Slowest: N/A

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/91.0.4472.114 Safari/537.36

Browser/OS: Chrome 91 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Without conversion	5234601.5 Ops/sec
Pre-converted Array	27357564.0 Ops/sec
Pre-converted Map	27372482.0 Ops/sec
Live conversion to Array	8895195.0 Ops/sec
Live convesion to Map	3824690.8 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 world of JavaScript microbenchmarks.

**Benchmark Overview**

The provided JSON represents a benchmark that tests different methods for performing key lookups in an object. The test cases are designed to compare the performance of various approaches, including:

1. Direct object lookup (without conversion)
2. Array-based lookup using `includes()`
3. Pre-converted array lookup
4. Map-based lookup using `has()`
5. Live conversion to an array-based lookup
6. Live conversion to a map-based lookup

**Test Case Analysis**

Let's analyze each test case:

1. **Without conversion**: This test case measures the performance of direct object lookup, without converting the keys to an array or map.
	* Pros: Simple and straightforward approach.
	* Cons: May not be optimized for performance in modern browsers.
2. **Pre-converted Array**: This test case uses `Object.keys()` to convert the object's keys to an array and then uses the `includes()` method to perform the lookup.
	* Pros: Can be faster than direct object lookup, as it leverages the optimized implementation of `includes()`.
	* Cons: Requires additional memory allocation for the temporary array.
3. **Pre-converted Map**: This test case converts the object's keys to a map using `Object.entries()` and then uses the `has()` method to perform the lookup.
	* Pros: Can be faster than direct object lookup, as it leverages the optimized implementation of `has()`.
	* Cons: Requires additional memory allocation for the temporary map.
4. **Live conversion to Array**: This test case creates a new array from the object's keys and then uses the `includes()` method to perform the lookup.
	* Pros: Can be faster than pre-converting the entire object, as it only creates a small temporary array.
	* Cons: Requires additional memory allocation for the temporary array.
5. **Live conversion to Map**: This test case creates a new map from the object's keys and then uses the `has()` method to perform the lookup.
	* Pros: Can be faster than pre-converting the entire object, as it only creates a small temporary map.
	* Cons: Requires additional memory allocation for the temporary map.

**Library Usage**

The benchmark makes use of two libraries:

1. **`Object.keys()`**: This is a built-in JavaScript method that returns an array-like object containing the keys of an object.
2. `Map`: This is a built-in JavaScript class that represents a collection of key-value pairs, with fast lookups using the `has()` method.

**Special JS Features**

None of the test cases utilize any special JavaScript features or syntax beyond what's considered standard for modern browsers.

**Benchmark Results**

The benchmark results show the execution per second for each test case, indicating which approach performs best in terms of speed. The top-performing test case is **Pre-converted Map**, followed closely by **Live conversion to Map** and **Pre-converted Array**.

**Alternatives**

Other alternatives for performing key lookups in JavaScript include:

1. Using a library like Lodash's `_.has()` or underscore's `_.includes()`
2. Implementing a custom lookup function using bitwise operations
3. Utilizing a more advanced data structure, such as a trie or suffix tree

Related benchmarks:

Key lookup using different methods. (version: 0)

Comparing performance of: Without conversion vs Pre-converted Array vs Pre-converted Map vs Live conversion to Array vs Live convesion to Map

Created: 3 years ago by: Guest

Jump to the latest result

Without conversion

Pre-converted Array

Pre-converted Map

Live conversion to Array

Live convesion to Map

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):