Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
Init array : Spread vs push
(version: 0)
Spread vs push
Comparing performance of:
Push vs Spread
Created:
4 years ago
by:
Guest
Jump to the latest result
Tests:
Push
const a = []; const condA = true; const condB = false; const condC = true; if (condA) a.push("elem1"); if (condB) a.push("elem2"); if (condC) a.push("elem3");
Spread
const condA = true; const condB = false; const condC = true; const a = [ ...(condA ? ['elem1'] : []), ...(condB ? ['elem2'] : []), ...(condC ? ['elem3'] : []) ];
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
Fork
Test case name
Result
Push
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
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks! The provided JSON represents two benchmark tests: "Init array : Spread vs push". These tests aim to measure the performance difference between two approaches for initializing an array with elements. **What is being tested?** Two test cases are being compared: 1. **Push**: This approach uses a traditional loop to push elements onto the array. 2. **Spread**: This approach uses the spread operator (`...`) to initialize the array with elements. **Options being compared:** The two approaches differ in how they initialize the array with elements. * In the **Push** approach, an initial empty array is created, and then elements are pushed onto it using the `push()` method. * In the **Spread** approach, a new array is created using the spread operator (`...`), which allows for more concise initialization of the array with elements. **Pros and Cons:** Here's a brief summary of the pros and cons of each approach: **Push:** Pros: * Easy to understand and implement * Works well for small arrays or when iterating over an existing array Cons: * Can be slower due to the overhead of pushing individual elements onto the array * May lead to memory fragmentation if the array grows rapidly **Spread:** Pros: * More concise and expressive syntax * Can be faster because it avoids the overhead of `push()` calls Cons: * Requires understanding of the spread operator and its behavior * May not work as expected for very large arrays or when iterating over an existing array **Library/Language feature:** There is no specific library being used in this benchmark. However, it's worth noting that the spread operator (`...`) was introduced in ECMAScript 2015 (ES6) and has since become a standard feature of JavaScript. **Special JS features/syntax:** None are mentioned explicitly in the provided benchmark definition. However, the use of the spread operator (`...`) does involve a specialized syntax for creating new arrays with elements. **Other alternatives:** If you're interested in exploring alternative approaches to initializing arrays, here are a few examples: * Using `Array.prototype.slice()` or `Array.prototype.concat()` to create a new array from an existing one * Utilizing libraries like Lodash (e.g., `lodash.array.from()`) for more functional programming-inspired solutions Keep in mind that these alternatives may not be as concise or efficient as the spread operator, and their performance characteristics will depend on the specific use case.
Related benchmarks:
Array .push() vs .unshift() vs spread
Pushing items via Array.push vs. Spread Operator
Javascript: Spread vs push
Array .push() vs spread operator
Spread vs Push when adding into array
Comments
Confirm delete:
Do you really want to delete benchmark?