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Slice vs spread and Pop
(version: 0)
Comparing performance of:
slice vs pop
Created:
3 years ago
by:
Guest
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Script Preparation code:
var arr = [1, 3, 5, 11, 13];
Tests:
slice
arr.slice(-1);
pop
const newArr = [...arr]; arr.pop()
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
slice
pop
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 dive into the world of JavaScript microbenchmarks! **What is tested on the provided JSON?** The provided JSON represents a benchmark test that compares two approaches to remove the last element from an array: 1. **Slice**: Using the `slice()` method with a negative index (`arr.slice(-1)`) to get the last element of the array. 2. **Spread and Pop**: Using the spread operator (`...`) to create a new array, followed by calling the `pop()` method on the original array (`const newArr = [...arr];\r\narr.pop()`). **Options compared** The two options being compared are: * Slice: `arr.slice(-1)` * Spread and Pop: `const newArr = [...arr];\r\narr.pop()` **Pros and Cons of each approach** * **Slice**: Pros: + Efficient, as it only returns the last element without modifying the original array. + Fast execution time due to the optimized implementation in modern JavaScript engines. Cons: + May not work correctly if the array is empty or has a single element. * **Spread and Pop**: Pros: + More intuitive for some developers, as it creates a new array and then removes the last element. Cons: + Requires creating a new array using the spread operator, which can be slower than simply returning the last element with `slice()`. + May not work correctly if the original array is large or has many elements. **Other considerations** * The use of the spread operator (`...`) to create a new array is a relatively recent feature introduced in ECMAScript 2018 (ES2018). This means that older JavaScript engines may not support it, which could affect performance. * Both approaches have their strengths and weaknesses. The choice between them often depends on the specific use case, personal preference, or the requirements of the project. **Library usage** The provided benchmark does not explicitly mention any libraries being used. However, some modern JavaScript engines might rely on internal libraries to optimize performance. **Special JS features or syntax** In this case, no special JavaScript features or syntax are being tested. The benchmark only involves standard JavaScript methods and operators. **Alternative approaches** Other alternatives for removing the last element from an array in JavaScript include: * `arr.length--` (decrementing the length property) * `arr.pop() && arr` (using the short-circuit operator to return a new array) * Using `Array.prototype.slice()` with a different index (e.g., `-2`)
Related benchmarks:
Array Slice vs Pop
Slice vs Pop vs At(-1)
Slice vs Spread & Pop
Last element slice vs pop
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