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spread array performance (vs slice, splice, concat) v2
(version: 0)
Comparing performance of:
Splice vs Slice vs Concat vs Spread
Created:
2 years ago
by:
Guest
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Tests:
Splice
const testArray = [1, 2, 3,4,5,6,7,8,9,10]; const newTestArray = testArray.splice(0);
Slice
const testArray = [1, 2, 3,4,5,6,7,8,9,10]; const newTestArray = testArray.slice();
Concat
const testArray = [1, 2, 3,4,5,6,7,8,9,10]; const newTestArray = [].concat(testArray);
Spread
const testArray = [1, 2, 3,4,5,6,7,8,9,10]; const newTestArray = [...testArray];
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (4)
Previous results
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Test case name
Result
Splice
Slice
Concat
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 benchmarks! **Benchmark Definition** The provided JSON defines a benchmarking test case, which measures the performance of different approaches to create a new array from an existing one. **Options Compared** There are four options compared in this benchmark: 1. **Splice**: Using `splice()` method to create a new array by removing elements from the original array. 2. **Slice**: Using `slice()` method to create a shallow copy of the original array, starting from a specified index and taking a specified number of elements. 3. **Concat**: Using `concat()` method to concatenate two arrays (in this case, the original array and an empty array) to create a new array. 4. **Spread**: Using the spread operator (`...`) to create a new array by spreading the elements of the original array. **Pros and Cons** Here's a brief summary of each option: * **Splice**: Creates a new array by removing elements from the original array, which can be inefficient if the array is large. + Pros: Simple implementation. + Cons: Can lead to performance issues for large arrays due to the overhead of modifying the original array. * **Slice**: Creates a shallow copy of the original array, starting from a specified index and taking a specified number of elements. + Pros: More efficient than `splice()` for creating a new array, especially for smaller arrays. + Cons: May not be suitable for larger arrays due to the overhead of copying elements. * **Concat**: Concatenates two arrays (in this case, the original array and an empty array) to create a new array. + Pros: Can handle large arrays efficiently by avoiding modifications to the original array. + Cons: Requires creating an intermediate empty array, which can lead to memory allocation overhead. * **Spread**: Creates a new array by spreading the elements of the original array. + Pros: Concise and readable implementation. + Cons: May be slower than other options due to the overhead of creating a new array. **Library Usage** None of the benchmarked methods rely on any external libraries, as they are built-in JavaScript features. **Special JS Features or Syntax** The `spread` operator (`...`) is used in this benchmark, which was introduced in ECMAScript 2015 (ES6). This feature allows for concise array creation by spreading elements from an iterable into a new array.
Related benchmarks:
simple spread vs concat benchmark
Splice+Spread vs concat to concat arrays
Concat vs Spread for Large Arrayss
Splice vs Spread vs Unshift vs Concat to insert at beginning of array (fixed from slice)
Array.prototype.concat vs spread operator on large array
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