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Push vs assignment
(version: 0)
Benchmark.js
Comparing performance of:
Push vs Assign
Created:
6 years ago
by:
Guest
Go to the latest result
Tests:
Push
let viewport = []; viewport.push(1,2);
Assign
let viewport = []; viewport = [1,2]
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
Fork
Test case name
Result
Push
Assign
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Android 14; Mobile; rv:137.0) Gecko/137.0 Firefox/137.0
Browser/OS:
Firefox Mobile 137 on Android
View result in a separate tab
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=599604" width="100%" height="500px"></iframe>
Assign
842.6M/s
Push
23.0M/s
View exact numbers
Test name
Executions per second
✓
Assign
842,619,328 Ops/sec
Push
23,012,410 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks. **Benchmark Definition** The provided JSON represents a benchmark definition with two test cases: "Push" and "Assign". The script preparation code is empty, which means that the benchmark uses only the JavaScript engine's built-in features. There's no special JS feature or syntax mentioned, so we'll focus on more general aspects. **Options Compared** In this benchmark, two options are being compared: 1. **Assignment vs Push**: In the "Assign" test case, a new array is assigned to the `viewport` variable using the assignment operator (`=`). In contrast, the "Push" test case uses the `push()` method to add elements to the existing array. 2. **Null vs undefined**: Although not explicitly mentioned in the benchmark definition, we can infer that there might be another option being compared: using a null or undefined value instead of an actual value for the push operation. **Pros and Cons of Each Approach** 1. **Assignment (Assign)**: * Pros: + Can be faster since it avoids creating a new array object. + May have better cache locality due to the assignment operator's behavior. * Cons: + Creates a new array object, which can lead to increased memory allocation and garbage collection overhead. 2. **Push**: * Pros: + Creates a new array object only when necessary (when `push()` is called), avoiding unnecessary allocations. + Can be more efficient for large arrays since it avoids creating a new object reference. * Cons: + May have slower performance due to the overhead of method calls and checking if the array is empty. **Library Considerations** There's no library mentioned in the benchmark definition, which suggests that the tests are designed to measure only JavaScript engine-specific optimizations. However, it's worth noting that some libraries might provide optimized implementations for arrays or other data structures, which could affect the results of this benchmark. **Special JS Features/Syntax (None)** Since there's no special JS feature or syntax mentioned in the benchmark definition, we can assume that these tests are designed to measure general JavaScript engine optimizations. **Other Alternatives** To create similar benchmarks, you could consider adding more test cases, such as: * Using different data types (e.g., numbers, strings, objects) instead of arrays. * Comparing other array operations, like `slice()`, `concat()`, or `forEach()`. * Including more browsers or devices to test the benchmark on. For example, you could add a new benchmark definition: ```json { "Name": "Array Slice", "Description": null, "Script Preparation Code": null, "Html Preparation Code": null } ``` And a corresponding test case: ```json [ { "Benchmark Definition": "let viewport = [1,2,3];\r\nviewport.slice(1);", "Test Name": "Slice" } ] ``` This would allow you to compare the performance of different array operations in various scenarios.
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