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array.splice vs for loop
(version: 0)
Comparing performance of:
array.splice vs for loop
Created:
9 years ago
by:
Guest
Go to the latest result
Script Preparation code:
s = new Set(); a = []; for (var i=0; i < 1000; i++) s.add(i*i);
Tests:
array.splice
a.splice(0, a.length, ...s.values());
for loop
a.length = 0; for (var x of s) a.push(x);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
array.splice
for loop
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 years ago
)
User agent:
Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Mobile Safari/537.36
Browser/OS:
Chrome Mobile 123 on Android
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=519104" width="100%" height="500px"></iframe>
array.splice
22K/s
for loop
7K/s
View exact numbers
Test name
Executions per second
✓
array.splice
21,988 Ops/sec
for loop
6,757 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what's being tested. **Benchmark Overview** The benchmark compares the performance of two approaches for populating an array `a` with values from a set `s`. The set is populated with squares of numbers from 0 to 999 using JavaScript syntax. **Approaches Compared** There are two test cases: 1. **Array Splice (`array.splice`)**: This approach uses the `splice()` method to replace the contents of array `a` with values from the set `s`. The `splice()` method takes three arguments: the starting index, the number of elements to remove, and a list of new elements. 2. **For Loop (`for loop`)**: This approach iterates over the set `s` using a `for...of` loop and pushes each value onto array `a`. **Pros and Cons** 1. **Array Splice** * Pros: + Can be more efficient if the length of `a` is known in advance. + Uses less memory, as it doesn't create temporary arrays. * Cons: + Requires modifying the original array. + May have performance issues if the set `s` has a large number of elements. 2. **For Loop** * Pros: + More predictable and controlled iteration. + Uses more memory, as an intermediate array is created to hold the values from `s`. * Cons: + May be slower due to the overhead of creating a temporary array. **Other Considerations** * The benchmark uses the `Set` data structure to populate the array with unique values. This helps to ensure that each value in `a` is distinct. * The `for...of` loop is used to iterate over the set, which is more efficient than using traditional indexing. **Special JavaScript Features/Syntax** None mentioned. **Library/Functionality Used** The benchmark uses a built-in JavaScript feature: the `Set` data structure and the `splice()` method. There are no external libraries required. **Alternative Approaches** Other alternatives could include: 1. Using an array constructor, such as `new Array()`, to create a new array from scratch. 2. Using the `Array.from()` method to create an array from the set. 3. Iterating over the set using traditional indexing (e.g., `for (var i = 0; i < s.size(); i++)`). These alternatives would likely have different performance characteristics and trade-offs compared to the approaches tested in this benchmark.
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