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goieqnoigneq
(version: 0)
Comparing performance of:
1 vs 2
Created:
2 years ago
by:
Guest
Go to the latest result
Tests:
1
const arr = Array.from({ length: 1e6 }, (_, i) => i); const a = Object.fromEntries(arr.map((i) => [i, i]));
2
const arr = Array.from({ length: 1e6 }, (_, i) => i); const b = {}; for (const i of arr) b[i] = i;
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
1
2
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 years ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:126.0) Gecko/20100101 Firefox/126.0
Browser/OS:
Firefox 126 on Mac OS X 10.15
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<iframe src="https://measurethat.net/Embed?id=528617" width="100%" height="500px"></iframe>
2
97/s
1
39/s
View exact numbers
Test name
Executions per second
✓
2
97 Ops/sec
1
39 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the provided benchmark and its various components. **Benchmark Definition** The Benchmark Definition is a JSON object that contains information about the benchmark being run. In this case, it's empty, with no name or description. The Script Preparation Code and Html Preparation Code fields are also blank. **Individual Test Cases** There are two test cases defined: 1. **Test Case 1:** * Benchmark Definition: Creates an array of 1 million elements using `Array.from()` and then maps over it to create another object using `Object.fromEntries()`. The resulting object is assigned to variable `a`. * Purpose: This test case creates a large object by iterating over an array and assigning each element as the key-value pair in the object. 2. **Test Case 2:** * Benchmark Definition: Creates an array of 1 million elements using `Array.from()` and then iterates over it, assigning each element as the key-value pair in an empty object (`b`). The resulting object is not assigned to any variable. **Options Compared** These two test cases compare the performance difference between: 1. Using `Object.fromEntries()` to create a new object from an array of key-value pairs. 2. Iterating over an array and assigning each element as the key-value pair in an empty object (`b`). **Pros and Cons:** * **Using `Object.fromEntries()`** + Pros: - Creates a new object with the desired structure, which can be more efficient for certain use cases. - Reduces memory allocation overhead compared to creating an object from scratch. + Cons: - May introduce additional overhead due to the creation of an intermediate array and its conversion to an object. - Requires JavaScript version support (ES6+) and may not work in older browsers. * **Iterating over an array and assigning each element as a key-value pair** + Pros: - Can be more efficient for small to medium-sized datasets, as it avoids the overhead of creating an intermediate object. - Works in older browsers that don't support `Object.fromEntries()`. + Cons: - May not be suitable for large datasets due to the increased memory allocation and garbage collection overhead. - Can lead to performance issues if not optimized correctly. **Library** There is no explicit library mentioned in the benchmark definition. However, `Array.from()` and `Object.fromEntries()` are built-in JavaScript methods that use the Web APIs (e.g., DOM, Web Workers) under the hood. **Special JS Feature or Syntax** None of the test cases explicitly uses special JavaScript features or syntax beyond standard ES6+ functionality.
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