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remove last array element (slice vs splice vs length vs pop)
(version: 0)
Comparing performance of:
slice vs splice vs length vs pop
Created:
4 years ago
by:
Guest
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Tests:
slice
let test_array = [1, 2, 3, 4]; test_array.slice(0, 3);
splice
let test_array = [1, 2, 3, 4]; test_array.splice(3, 1);
length
let test_array = [1, 2, 3, 4]; test_array.length = 3;
pop
let test_array = [1, 2, 3, 4]; test_array.pop();
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (4)
Previous results
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Test case name
Result
slice
splice
length
pop
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36
Browser/OS:
Chrome 131 on Windows
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Test name
Executions per second
slice
24587666.0 Ops/sec
splice
16281201.0 Ops/sec
length
10719887.0 Ops/sec
pop
43813216.0 Ops/sec
Autogenerated LLM Summary
(model
llama3.1:latest
, generated one year ago):
**Benchmark Description** The provided JSON represents a benchmark test case on MeasureThat.net, which compares the performance of four different approaches to removing the last element from an array in JavaScript. **Test Cases** There are four individual test cases: 1. **Slice**: `test_array.slice(0, 3);` 2. **Splice**: `test_array.splice(3, 1);` 3. **Length**: `test_array.length = 3;` 4. **Pop**: `test_array.pop();` **Options Compared** The test cases compare four different approaches to remove the last element from an array: * **Slice (0, 3)**: This approach uses the `slice()` method with start and end indices to create a new array without the last element. * **Splice (3, 1)**: This approach uses the `splice()` method to remove one element at index 3, effectively removing the last element from the original array. * **Length = 3**: This approach sets the length property of the array to 3, which removes the last element by truncating the array's size. * **Pop**: This approach uses the `pop()` method to directly remove and return the last element from the array. **Pros/Cons** Here are some pros and cons for each approach: * **Slice (0, 3)**: + Pros: creates a new array without modifying the original one, which can be useful in certain scenarios. + Cons: creates a new array, which can lead to performance issues if working with large arrays. * **Splice (3, 1)**: + Pros: modifies the original array, which can be beneficial when working with large datasets. + Cons: can be slower than other approaches due to the overhead of modifying the array's internal state. * **Length = 3**: + Pros: simple and efficient approach that directly modifies the array's size. + Cons: does not return the removed element, which may not be desirable in some cases. * **Pop**: + Pros: returns the removed element, which can be useful when working with arrays of objects or complex data structures. + Cons: modifies the original array and only returns a single value. **Other Considerations** When choosing an approach, consider the following: * Performance: If you're working with large datasets, **splice (3, 1)** might be slower than other approaches due to the overhead of modifying the array's internal state. * Data integrity: If you need to preserve the original array and its contents, **slice (0, 3)** or **pop** might be better options. No external libraries or special JavaScript features are used in this benchmark test case. The results show that **pop** is the fastest approach on Chrome 97, followed by **splice (3, 1)**, then **length = 3**, and finally **slice (0, 3)**. Other alternatives to consider when removing elements from an array include: * Using `filter()` method with a callback function * Utilizing JavaScript's destructuring syntax to create new arrays without modifying the original one
Related benchmarks:
Splice vs shift to remove at beginning of array (fixed from slice)
Slice vs Splice vs Shift for 1 item
Slice vs Splice vs Shift 231
Empty array: Splice vs Shift
Empty array: Splice vs Shift vs Pop
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