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Spread vs Push
(version: 0)
Comparing performance of:
Spread vs Push
Created:
7 years ago
by:
Guest
Jump to the latest result
Tests:
Spread
let x = [] for (let i = 0; i < 100; i++) { x = [...x, i] }
Push
let x = [] for (let i = 0; i < 100; i++) { x.push(i) }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Spread
Push
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'd be happy to help explain the provided benchmark. **Benchmark Overview** The provided JSON represents a JavaScript microbenchmark on MeasureThat.net, which tests two different approaches for adding elements to an array: using the spread operator (`...`) or the `push()` method. **Options Compared** There are two options being compared: 1. **Spread Operator (`...`)**: This approach uses the spread operator to create a new array by concatenating the existing array `x` with the element `i`. 2. **Push Method**: This approach uses the `push()` method to add elements to the end of the array `x`. **Pros and Cons** Here are some pros and cons of each approach: * **Spread Operator (`...`)**: + Pros: Can be more concise and readable, especially for adding multiple elements at once. + Cons: Creates a new array object every time it's used, which can lead to performance issues with large datasets. * **Push Method**: + Pros: Does not create a new array object, reducing memory allocation overhead. It also allows for efficient insertion of elements at the end of the array. + Cons: Can be less readable and more verbose than using the spread operator. **Library Usage** There is no explicit library usage in this benchmark. However, it's worth noting that some browsers may use optimizations or inlining of the `push()` method, which could affect performance. **Special JS Features/Syntax** This benchmark does not use any special JavaScript features or syntax. It only uses standard JavaScript features and syntax. **Other Alternatives** If you're interested in alternative approaches to adding elements to an array, here are a few options: * **Array.prototype.concat()**: Similar to the spread operator, this method creates a new array by concatenating two arrays. * **Array.prototype.unshift()**: Adds one or more elements to the beginning of an array. * **Native Array.prototype.push()**: Adds one or more elements to the end of an array (as used in this benchmark). * **Indexed assignment**: This approach involves assigning individual elements to a specific index in the array, which can be less efficient than using `push()`. In summary, the spread operator and push method are two common approaches for adding elements to an array in JavaScript. While both have their pros and cons, the push method is generally considered more efficient due to its ability to insert elements at the end of the array without creating a new object.
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