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Array.prototype.slice vs spread operator copy
(version: 0)
Compare the new ES6 spread operator with the traditional slice() method
Comparing performance of:
Array.prototype.slice vs spread operator
Created:
6 years ago
by:
Guest
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Tests:
Array.prototype.slice
var params = [ "hello", true, 7 ]; var other = params.slice();
spread operator
var params = [ "hello", true, 7 ] var other = [ ...params ]
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
Array.prototype.slice
spread operator
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 years ago
)
User agent:
Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Mobile Safari/537.36
Browser/OS:
Chrome Mobile 120 on Android
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=490952" width="100%" height="500px"></iframe>
Array.prototype.slice
119.4M/s
spread operator
71.1M/s
View exact numbers
Test name
Executions per second
✓
Array.prototype.slice
119,386,520 Ops/sec
spread operator
71,111,560 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the explanation of the provided benchmark. **What is being tested?** The benchmark compares two approaches to create a copy of an array: the traditional `Array.prototype.slice()` method and the new ES6 spread operator (`[ ...params ]`). The test case creates an array `params` with three elements: a string, a boolean, and a number. It then measures the execution time for each approach to create a copy of this array. **Options compared** The benchmark is comparing two options: 1. **Array.prototype.slice()**: This method returns a shallow copy of the original array. It takes an optional start and end index as arguments. 2. **Spread operator (`[ ...params ]`)**: This operator creates a new array by spreading the elements of the original array into new positions. **Pros and Cons** 1. `Array.prototype.slice()`: * Pros: + Wide browser support (since 1998) + Well-documented * Cons: + Can be slow for large arrays due to the overhead of creating a new array object 2. Spread operator (`[ ...params ]`): * Pros: + Fast and efficient, especially for large arrays + Simple and concise syntax * Cons: + Requires modern browsers that support ES6 (2009) + May not be supported in older browsers **Library usage** In the benchmark, there is no explicit library usage. However, it's worth noting that the spread operator relies on the `Array.prototype.slice()` method internally to create a shallow copy of the array. **Special JS feature or syntax** The benchmark uses the ES6 spread operator (`[ ...params ]`), which was introduced in 2015 as part of the ECMAScript 2015 standard. This feature is supported by modern browsers and Node.js versions starting from ES6. **Other alternatives** If you need to support older browsers that don't support the spread operator, you can use alternative approaches: 1. **Array.prototype.slice()**: As mentioned earlier, this method is widely supported but may be slower for large arrays. 2. **Array.prototype.concat()**: This method creates a new array by concatenating multiple arrays or iterables. You can use `concat()` with an initial value to create a copy of the original array: `[ ...params ].concat()`. 3. **Array.from()**: If you're using modern browsers, you can use `Array.from()` with an iterable (in this case, the string `'hello'`) to create a new array: `Array.from(['hello'], String)`. These alternatives may have different performance characteristics and are not as concise as the spread operator.
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