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Splice vs Pop for replacing last item
(version: 0)
Comparing performance of:
Pop + Concat vs Splice vs Pop + Push
Created:
5 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var list = []; for (var i = 0; i < 1000 * 1000; i++) { list.push(i); }
Tests:
Pop + Concat
list.pop() list = list.concat(1)
Splice
list.splice(-1, 1, 1);
Pop + Push
list.pop() list.push(1)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
Pop + Concat
Splice
Pop + Push
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what is being tested. **Benchmark Definition** The benchmark definition represents three test cases: 1. **"Splice vs Pop for replacing last item"**: This is a broad description of the benchmark, indicating that it compares the performance of `splice` versus `pop` methods when used together to replace the last element in an array. 2. **Individual Test Cases**: * `"Pop + Concat"`: This test case measures the performance of `list.pop()` followed by `list.concat(1)`. * `"Splice"`: This test case measures the performance of `list.splice(-1, 1)` alone. * `"Pop + Push"`: This test case measures the performance of `list.pop()` followed by `list.push(1)`. **Options Compared** The benchmark compares three different approaches to replace the last element in an array: 1. **Using `splice`**: The `splice` method is used to remove and replace the last element at a specified index. 2. **Using `pop` followed by `concat`**: The `pop` method removes and returns the last element, which is then replaced with a new value using the `concat` method. 3. **Using `push`**: The `push` method adds a new element to the end of the array. **Pros and Cons** * **Using `splice`**: Pros: + More efficient than `pop` followed by `concat`, as it only requires one operation. + Can be faster for larger arrays, since it avoids creating a new array. * **Using `pop` followed by `concat`**: Pros: + Easier to understand and implement than using `splice`. + Can be more intuitive for developers who are familiar with the `concat` method. * **Using `push`**: Cons: + Less efficient than `splice`, since it requires creating a new array element. + May lead to slower performance for larger arrays. **Library** The benchmark uses the built-in JavaScript Array prototype, which provides methods for manipulating and accessing array elements. In this case, the `concat`, `splice`, and `push` methods are used to compare their performance in replacing the last element in an array. **Special JS Feature/Syntax** There is no specific JavaScript feature or syntax being tested in this benchmark. The focus is on comparing different approaches to replace the last element in an array using built-in Array prototype methods. **Alternatives** Other alternatives for replacing the last element in an array include: * Using `slice()` and assigning a new value to the resulting array * Using `set()` (available in modern browsers) and passing the new value as the second argument * Using a custom implementation, such as using `indexOf` and `slice()` However, these alternatives are not being tested in this benchmark.
Related benchmarks:
splice twice VS shift + pop
splice vs push
Pop vs Splice [fast]
splice vs double pop
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