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Array.prototype.slice vs Array.prototype.slice(0) vs spread operator
(version: 0)
Compare the new ES6 spread operator with the traditional slice() and slice(0) methods
Comparing performance of:
Array.prototype.slice vs Array.prototype.slice(0) vs spread operator
Created:
5 years ago
by:
Guest
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Tests:
Array.prototype.slice
var test = ["hello", true, 7]; var copy = test.slice();
Array.prototype.slice(0)
var test = ["hello", true, 7]; var copy = test.slice(0);
spread operator
var test = ["hello", true, 7]; var copy = [...test];
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
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Test case name
Result
Array.prototype.slice
Array.prototype.slice(0)
spread operator
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Overview of the Benchmark** The provided JSON represents a JavaScript microbenchmark that compares the performance of three different methods for creating a copy of an array: 1. `Array.prototype.slice()` 2. `Array.prototype.slice(0)` 3. The spread operator (`...`) **What is tested?** In each test case, an array `test` containing a string, a boolean, and an integer is created. A copy of the array is then created using one of the three methods: 1. `Array.prototype.slice()` 2. `Array.prototype.slice(0)` 3. The spread operator (`...`) The benchmark measures the number of executions per second (ExecutionsPerSecond) for each method, providing an estimate of their relative performance. **Options compared** The benchmark compares the following three options: 1. **`Array.prototype.slice()`**: A traditional method for creating a shallow copy of an array. 2. **`Array.prototype.slice(0)`**: A variation of `slice()` that creates a new array with only the first element (index 0) copied from the original array. 3. **Spread operator (`...`)**: A newer method introduced in ECMAScript 2015, which allows for concise creation of an array by expanding an existing array or other iterable. **Pros and cons** 1. **`Array.prototype.slice()`**: * Pros: Widely supported, easy to use. * Cons: Can be slow for large arrays due to the overhead of creating a new object with multiple properties. 2. **`Array.prototype.slice(0)`**: * Pros: Fast and lightweight, as it only copies the first element from the original array. * Cons: May not preserve all properties of the original array if they are not the first one. 3. **Spread operator (`...`)**: * Pros: Concise and expressive syntax, creates a new array with no overhead. * Cons: Introduced in ECMAScript 2015, may require additional support for older browsers. **Library usage** In this benchmark, none of the libraries are explicitly mentioned. However, it's worth noting that some JavaScript engines might use proprietary optimization techniques or caching mechanisms that could influence the results. **Special JS feature/syntax** The spread operator (`...`) is a relatively new syntax introduced in ECMAScript 2015. While widely supported, older browsers may not have optimal support for this feature. In summary, the benchmark provides a concise comparison of three methods for creating array copies, highlighting the trade-offs between traditional `slice()`, optimized `slice(0)`, and the newer spread operator syntax.
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