Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
slice method vs spread operator
(version: 0)
Comparing performance of:
slice vs spread
Created:
3 years ago
by:
Guest
Jump to the latest result
Tests:
slice
const arr = ["foo", "bar", "baz"] const slice = arr.slice()
spread
const arr = ["foo", "bar", "baz"] const spread = [...arr]
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
Fork
Test case name
Result
slice
spread
Fastest:
N/A
Slowest:
N/A
Latest run results:
No previous run results
This benchmark does not have any results yet. Be the first one
to run it!
Autogenerated LLM Summary
(model
llama3.1:latest
, generated one year ago):
Let's dive into the benchmark definition and results. **Benchmark Definition** The benchmark is testing two different approaches to creating a copy of an array in JavaScript: using the `slice()` method versus using the spread operator (`...`). **Test Cases** There are two test cases: 1. **"slice"**: This test case uses the `slice()` method to create a copy of the array `arr = ["foo", "bar", "baz"]`. The code snippet is: `const slice = arr.slice()`. 2. **"spread"**: This test case uses the spread operator (`...`) to create a copy of the array `arr = ["foo", "bar", "baz"]`. The code snippet is: `const spread = [...arr]`. **Library/Features Used** No external libraries are used in this benchmark. **Special JS Feature or Syntax** Yes, two special JavaScript features are used: 1. **Array Spread Operator (`...`)**: This feature allows you to create a new array by spreading the elements of an existing array. 2. **Array `slice()` method**: This method creates a shallow copy of an array. **Pros and Cons of Each Approach** Here's a brief summary: * **"slice()" Method**: + Pros: Efficient, widely supported, and easy to read. + Cons: May not be suitable for very large arrays or complex data structures. * **Spread Operator (`...`)**: + Pros: Readable and concise code, can handle complex data structures. + Cons: May be slower than `slice()` method for small arrays. **Other Alternatives** Besides these two approaches, you can also use other methods to create a copy of an array in JavaScript: * **Array Concatenation (`Array.concat()`)**: Similar to the spread operator, but with more overhead. * **JSON.stringify() and JSON.parse()**: Not recommended for performance-critical code due to parsing overhead. **Other Considerations** When choosing between these approaches, consider the following factors: * **Performance**: If you're dealing with large datasets or complex data structures, `slice()` method might be a better choice. * **Readability**: Use spread operator (`...`) when readability is crucial and the array structure is simple. * **Edge Cases**: Consider using other methods (like `Array.concat()`) if you need to handle edge cases not covered by `slice()` or spread operator.
Related benchmarks:
Array.prototype.slice vs spread operator 123
Array.prototype.slice vs spread operator with length limit
arr.slice() vs spread operator
Array.prototype.slice vs spread operator With slightly bigger array
Array.prototype.slice vs spread operator test
Comments
Confirm delete:
Do you really want to delete benchmark?