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Javascript Push vs Spread
(version: 0)
Comparing performance of:
Spread vs Push
Created:
5 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var testArray = [1, 23, 3, 4, 5, 6, 7, 7, 8, 89, 9, 23, 423, 42, 1, 23, 5, 6, 7, 7, 8, 23, 3, 4, 5, 6, 7, 7, 8, 89, 9, 23, 423, 42, 1, 23, 5, 6, 7, 7, 23, 3, 4, 5, 6, 7, 7, 8, 89, 9, 23, 423, 42, 1, 23, 5, 6, 7, 7, 23, 3, 4, 5, 6, 7, 7, 8, 89, 9, 23, 423, 42, 1, 23, 5, 6, 7, 7];
Tests:
Spread
testArray = [...testArray, 4]
Push
testArray.push(4)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
Fork
Test case name
Result
Spread
Push
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks! **What is being tested?** The provided JSON represents two individual test cases, each testing the performance of two different approaches to add an element to an array in JavaScript: 1. **Push**: This approach uses the `push()` method to add a new element to the end of the array. 2. **Spread**: This approach uses the spread operator (`...`) to create a new array with the original elements and then adds a new element to it. **Options compared** In this benchmark, only two options are being compared: * `Push` * `Spread` **Pros and Cons of each approach:** ### Push * **Pros:** The `push()` method is generally faster than the spread operator because it does not require creating a new array or copying elements. It also updates the length property of the array, which can be beneficial for some use cases. * **Cons:** The `push()` method modifies the original array and returns the updated length, which might lead to unexpected behavior in some cases. ### Spread * **Pros:** The spread operator is often considered more concise and easier to read than using `push()`. It creates a new array without modifying the original one. * **Cons:** Creating a new array can be slower than modifying an existing array, especially for large datasets. Additionally, the spread operator might lead to unnecessary memory allocations. **Library and purpose** In this benchmark, no external libraries are used. **Special JS feature or syntax** There is no special JavaScript feature or syntax being tested in this benchmark. It only involves basic array manipulation using `push()` and the spread operator. **Other alternatives** If you want to explore other approaches for adding elements to an array, here are a few alternatives: * **Concatenation**: You can concatenate arrays using the `concat()` method: `testArray = testArray.concat([4])`. However, this approach is generally slower than `push()` and spread. * **Array.prototype.slice()**: You can use `slice()` to create a shallow copy of the original array and then add an element: `testArray = testArray.slice(0).concat([4])`. This approach is similar to using `concat()` but involves additional overhead. In summary, when it comes to adding elements to an array in JavaScript, both `push()` and the spread operator are viable options. The choice between them depends on your specific use case, performance requirements, and personal preference.
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