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Map get VS Map has get part 2
(version: 0)
Map get VS Map has get
Comparing performance of:
Map 1 vs Map 2
Created:
3 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var i = 0, count = 1000, a; var map = new Map(); for (i = 0; i < count; i++) { if (Math.random() > 0.5) { map.set(i, i * i); } }
Tests:
Map 1
let b; for (i = 0; i < count; i++) { a = map.get(i); if (a) { b = a; } }
Map 2
let b; for (i = 0; i < count; i++) { if (map.has(i)) { b = map.get(i); } }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Map 1
Map 2
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (X11; Linux x86_64; rv:133.0) Gecko/20100101 Firefox/133.0
Browser/OS:
Firefox 133 on Linux
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=576684" width="100%" height="500px"></iframe>
Map 2
61K/s
Map 1
58K/s
View exact numbers
Test name
Executions per second
✓
Map 2
61,088 Ops/sec
Map 1
57,938 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down what is being tested in this benchmark and the pros/cons of different approaches. **Benchmark Definition** The benchmark measures the performance difference between two ways to retrieve values from a `Map` object: 1. Using `map.get()` 2. Using `map.has()` followed by `map.get()` **Script Preparation Code** The script creates a new `Map` object and populates it with 1000 key-value pairs, where each value is the square of its corresponding key. **Html Preparation Code** There is no HTML preparation code provided, so we'll focus on the JavaScript aspects only. **Individual Test Cases** We have two test cases: 1. **Test Case "Map 1"** ```javascript let b; for (i = 0; i < count; i++) { a = map.get(i); if (a) { b = a; } } ``` This code uses `map.get()` to retrieve the value associated with each key and assigns it to `b` only if the value is not null or undefined. 2. **Test Case "Map 2"** ```javascript let b; for (i = 0; i < count; i++) { if (map.has(i)) { b = map.get(i); } } ``` This code uses `map.has()` to check if each key exists in the map and then uses `map.get()` to retrieve its value, assigning it to `b`. **Pros/Cons of Different Approaches** 1. **`map.get()`** * Pros: Simple and efficient for most use cases. * Cons: If the key is not found, it will return `undefined`, which can lead to unnecessary iterations in some cases. 2. **`map.has()` followed by `map.get()` * Pros: Ensures that the key exists before attempting to retrieve its value, avoiding null or undefined values. * Cons: Requires an additional iteration, potentially leading to slower performance. **Library and Purpose** In this benchmark, no external libraries are used. The `Map` object is a built-in JavaScript data structure. **Special JS Features/Syntax** None of the test cases use any special JavaScript features or syntax that would affect their execution. **Other Alternatives** If you wanted to test alternative approaches, you could consider: * Using `Object.keys()` and `at()` (ECMAScript 2022) to iterate over map entries * Using a custom function to check if the key exists in the map before retrieving its value * Comparing the performance of different map implementations, such as `Map` vs. `WeakMap` * Measuring the impact of using `map.get()` vs. `map.has()` on memory usage or other factors Keep in mind that these alternatives might not be directly relevant to the specific use case being tested and may introduce additional complexity.
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