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splice-vs-sliceconcat-slicespread
(version: 0)
Comparing performance of:
Splice vs Slice vs Spread
Created:
6 years ago
by:
Guest
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Tests:
Splice
const testArray = [1, 2, 3, 4]; testArray.splice(1, 1);
Slice
const testArray = [1, 2, 3, 4]; const newTestArray = testArray.slice(0, 1).concat(testArray.slice(2, testArray.length))
Spread
const testArray = [1, 2, 3, 4]; const newTestArray = [...testArray.slice(0, 1), ...testArray.slice(2, testArray.length)];
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
Splice
Slice
Spread
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net. **Benchmark Overview** The provided benchmark measures the performance differences between three approaches to modify an array: 1. `splice()` 2. `slice()` + `concat()` 3. `spread` operator (`...`) These approaches are designed to create a new array by modifying the original one, which is a common use case in JavaScript. **Options Compared** The benchmark compares the performance of each approach on an example array `[1, 2, 3, 4]`. The options being compared are: * `splice()`: Modifies the original array by removing or replacing elements. It returns the number of elements removed or replaced. * `slice()` + `concat()`: Creates a new array by using `slice()` to extract a subset of elements and then concatenating it with another slice of the same array. This approach creates two intermediate arrays. * `spread` operator (`...`): Creates a new array by spreading the elements of the original array into a new array. **Pros and Cons** Here's a brief overview of each approach: * `splice()`: Pros: simple, efficient for small modifications. Cons: modifies the original array, can be slow if used incorrectly (e.g., removing too many elements). * `slice()` + `concat()`: Pros: creates a new array, but uses two intermediate arrays and concatenation, which can be slow. Cons: more memory-intensive than `splice`. * `spread` operator (`...`): Pros: efficient, creates a new array without modifying the original one. Cons: requires modern JavaScript versions (ECMAScript 2018+) to use. **Library Usage** There is no explicit library usage in this benchmark. However, it's worth noting that some implementations of `splice()` or `slice()` might rely on browser-specific libraries or native methods under the hood. **Special JS Feature/ Syntax** The benchmark uses the spread operator (`...`) which was introduced in ECMAScript 2015 (ES6). This feature allows creating a new array by spreading elements into it. The benchmark also uses the `const` keyword, which is part of ES6 syntax for declaring constants. **Other Alternatives** If you're looking for alternative approaches to modify an array, here are a few more: * `Array.prototype.map()`: Creates a new array with mapped values. * `Array.prototype.filter()`: Creates a new array with filtered elements. * Using `Array.from()` or `Array.of()` to create a new array from an iterable or array. Keep in mind that each approach has its trade-offs in terms of performance, memory usage, and readability. The choice ultimately depends on the specific requirements and constraints of your project.
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