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Array construct vs array push
(version: 0)
Comparing performance of:
array construct vs array push
Created:
6 years ago
by:
Guest
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Tests:
array construct
let a = []; for(let i=0; i <= 1000; i=i+1) { a = [...a, i ]; };
array push
const a = []; for(let i=0; i <= 1000; i = i + 1) { a.push(i); };
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Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
array construct
array push
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided JSON and explain what is tested in each benchmark. **Benchmark Definition** The benchmark definition defines two tests: 1. `Array Construct`: This test measures the performance of creating an array using the spread operator (`[...a, i]`) compared to the traditional way of appending elements to an existing array. 2. `Array Push`: This test measures the performance of using the `push()` method to append elements to an existing array. **Options Compared** In both tests, two approaches are being compared: 1. **Spread Operator (`[...a, i]`)**: This approach creates a new array by spreading the contents of an existing array (`a`) and appending a new element (`i`). The spread operator is a modern JavaScript feature introduced in ECMAScript 2015. 2. **Traditional Append (`a = [...a, i];`)**: This approach modifies the original array `a` by using the assignment operator to create a new array with the appended element. **Pros and Cons** Here's a brief analysis of each approach: * **Spread Operator (`[...a, i]`)**: + Pros: More concise, readable, and efficient way to create arrays. + Cons: May lead to unnecessary object creation and garbage collection. * **Traditional Append (`a = [...a, i];`)**: + Pros: Can be more memory-efficient for large datasets, as it avoids creating a new array object. + Cons: Less concise and readable than the spread operator. Other considerations: * For small datasets, the performance difference between these approaches may be negligible. * However, for larger datasets or performance-critical applications, the choice of approach can significantly impact execution time. * The use of the spread operator is generally preferred in modern JavaScript development due to its simplicity and readability benefits. **Library** There are no libraries mentioned in the provided benchmark definition. All tests rely on built-in JavaScript features. **Special JS Feature or Syntax** The spread operator (`[...a, i]`) is a special JavaScript feature introduced in ECMAScript 2015 (ES6). It allows for concise and expressive array creation and manipulation. **Other Alternatives** If you're interested in exploring alternative approaches to creating arrays, here are some other options: * Using `Array.prototype.push()`: Instead of modifying an existing array, you can create a new array using the `push()` method. This approach is more memory-efficient but may be less concise and readable. * Using `Array.concat()`: Another way to concatenate arrays is by using the `concat()` method. However, this approach has similar performance characteristics to traditional append. Keep in mind that these alternative approaches might not provide significant performance benefits for most use cases, especially with modern JavaScript engines that optimize array operations efficiently.
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Array.from() vs new Array() vs push
Spread vs Push when adding into array
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