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slice VS splice 1234567
(version: 0)
Comparing performance of:
slice vs splice
Created:
2 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var list = []; for (var i = 0; i < 1000 * 1000; i++) { list.push(i); }
Tests:
slice
list = list.slice(1000);
splice
list.splice(0, 1000);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
slice
splice
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 years ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:127.0) Gecko/20100101 Firefox/127.0
Browser/OS:
Firefox 127 on Windows
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=532537" width="100%" height="500px"></iframe>
splice
39.8M/s
slice
20K/s
View exact numbers
Test name
Executions per second
✓
splice
39,776,640 Ops/sec
slice
19,847 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark JSON and explain what's being tested, compared, and other considerations. **Benchmark Definition** The benchmark is designed to compare the performance of two approaches: `Array.prototype.slice()` and `Array.prototype.splice()`. The benchmark definition code defines an array `list` with 1 million elements and then calls either `slice()` or `splice()` on the array. **Options Compared** There are only two options being compared: 1. `slice()`: This method creates a shallow copy of the specified range of elements in the original array. 2. `splice()`: This method removes elements from the specified index to the end of the array, returning the removed elements as an array. **Pros and Cons** * `slice()` has some advantages: + It's generally faster than `splice()` because it only needs to access the elements in the range, whereas `splice()` needs to shift all the elements after the removal. + It creates a new array object without modifying the original array. * However, `slice()` also has some disadvantages: + It can be slower for large arrays if the JavaScript engine has to allocate a lot of memory to create the new array object. * On the other hand, `splice()` has some advantages: + It's generally faster than `slice()` because it only needs to update the indices of the elements after the removal. + However, it can be slower for small arrays or if the JavaScript engine has to allocate a lot of memory to create the new array object. **Library and Purpose** In this benchmark, there is no explicit library being used. The `Array.prototype.slice()` and `Array.prototype.splice()` methods are part of the built-in JavaScript API. **Special JS Feature or Syntax (None)** There are no special JavaScript features or syntax being tested in this benchmark. **Other Alternatives** While not explicitly mentioned, other alternatives for large array manipulation could include: * Using a custom implementation with a loop to shift elements * Using a library like Lodash or Ramda that provides optimized array methods * Using a parallel processing approach to divide the work among multiple threads or processes The benchmark results show that `splice()` is significantly slower than `slice()` in this particular case, likely due to the overhead of updating the indices of the elements after removal.
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