Benchmark: map vs obj3 - MeasureThat.net

HTML Preparation code:

<script src="lodash.js"></script>

Script Preparation code:

var array = [...Array(1000).keys()];
var map = new Map(array.map(a =>[a,a]));
var obj = Object.fromEntries(map);
var setMap = new Map()
var setObj = {}

Tests:

getMap
for (let i = 0; i< 1000; i++ ){ map.get(i) }
getObj
for (let i = 0; i< 1000; i++ ){ obj[i] }
setMap
for (let i = 0; i< 1000; i++ ){ setMap.set(i,i) }
setObj
for (let i = 0; i< 1000; i++ ){ setObj[i] = i }
setMap2
for (let i = 0; i< 1000; i++ ){ map.set(i,i * 2) }
setObj2
for (let i = 0; i< 1000; i++ ){ obj[i] = i * 2 }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
getMap
getObj
setMap
setObj
setMap2
setObj2

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):

LLMs can make mistakes. Check important info.

Let's break down the provided JSON and explain what's being tested.

**Benchmark Definition**

The benchmark definition represents a JavaScript code snippet that defines two objects (maps) and one set. The goal is to compare the performance of accessing elements in these data structures.

Here are the components being compared:

1. **Map (`map`)**: A Map is an object that stores key-value pairs, where each key is unique and maps to a specific value.
2. **Object (`obj`)**: An Object is an unordered collection of key-value pairs.
3. **Set (`setMap`)**: A Set is an unordered collection of unique values.

**Options being compared**

The options being compared are:

1. Accessing elements using `map.get(i)` (in the first test case)
2. Accessing elements using `obj[i]` (in the second test case)
3. Setting elements using `setMap.set(i, i)` (in the third and fourth test cases)

**Pros and Cons of each approach**

1. **Accessing elements using `map.get(i)`**:
	* Pros: Map is optimized for fast lookups, which makes it suitable for this type of access pattern.
	* Cons: Maps have a higher memory footprint compared to Objects.
2. **Accessing elements using `obj[i]`**:
	* Pros: Objects are more widely supported and have a lower memory footprint compared to Maps.
	* Cons: Object lookups can be slower due to the need to traverse the object's prototype chain.
3. **Setting elements using `setMap.set(i, i)`**:
	* Pros: Sets are optimized for fast insertions, which makes them suitable for this type of set operation.
	* Cons: Setting an element in a Set is less efficient than setting it in a Map.

**Library usage**

The benchmark uses the **Lodash library**, which is included via the `Html Preparation Code` field. Lodash provides various utility functions, including those used to create and manipulate Maps and Sets.

**Special JavaScript features or syntax**

None of the test cases use any special JavaScript features or syntax that would affect their performance.

**Alternative approaches**

Other alternatives for accessing elements in data structures include:

1. **Arrays**: While not as efficient as Maps for lookups, arrays can still be used for this purpose.
2. **Sets**: Other Set implementations, such as the built-in `Set` object in JavaScript, could also be used.
3. **Object properties**: Instead of using `map.get(i)` or `obj[i]`, developers could use dot notation or bracket notation to access properties.

Keep in mind that the performance differences between these approaches can vary depending on the specific use case and implementation details.

Latest run results:

Run details: (Test run date: 5 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:64.0) Gecko/20100101 Firefox/64.0

Browser/OS: Firefox 64 on Mac OS X 10.14

View result in a separate tab

Test name	Executions per second
getMap	28778.6 Ops/sec
getObj	272037.9 Ops/sec
setMap	18298.0 Ops/sec
setObj	270425.8 Ops/sec
setMap2	17638.4 Ops/sec
setObj2	262600.9 Ops/sec

Related benchmarks:

map vs obj3 (version: 0)

Comparing performance of: getMap vs getObj vs setMap vs setObj vs setMap2 vs setObj2

Created: 5 years ago by: Guest

Jump to the latest result

getMap

getObj

setMap

setObj

setMap2

setObj2

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):