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Concat vs Push vs Spread Benchmark
(version: 0)
Comparing performance of:
Spread vs Concat vs Push
Created:
3 years ago
by:
Guest
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Tests:
Spread
const a = new Array(1e3).fill(99); const b = [1,2,3, ...a];
Concat
const a = new Array(1e3).fill(99); const b = [1,2,3].concat(a);
Push
const a = new Array(1e3).fill(99); const b = [1,2,3]; b.push(...a);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
Spread
Concat
Push
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Overview of the Benchmark** The provided JSON represents a JavaScript microbenchmark test case created on MeasureThat.net. The benchmark compares three different approaches for concatenating or spreading an array: `concat`, `push` with spread, and `spread` itself. **Benchmark Definition** The benchmark definition is not explicitly stated in the JSON, but it can be inferred from the individual test cases. The goal of this benchmark is to measure the performance difference between these three approaches on a large array (1 million elements). **Approaches Compared** 1. **Concat**: This approach uses the `concat` method to concatenate two arrays: `[1, 2, 3]` and the spread of an array `a`. The resulting array will have all elements from both input arrays. 2. **Push with Spread**: This approach uses the `push` method in combination with the spread operator (`...`) to add elements from another array `a` to the existing array `[1, 2, 3]`. 3. **Spread**: This approach uses the spread operator (`...`) alone on an array `a`, without any additional operations. **Pros and Cons of Each Approach** * **Concat**: * Pros: Simple and straightforward implementation. * Cons: May involve more memory allocations and copies, leading to higher overhead due to garbage collection. * **Push with Spread**: * Pros: More efficient than `concat` since it avoids creating a new array, instead using the existing one. * Cons: Requires two operations (push followed by spread) which might be slightly slower than the single operation used in `spread`. * **Spread**: * Pros: Most efficient approach as it only involves a single operation with minimal overhead. * Cons: May require more advanced understanding of JavaScript features and can lead to confusing code for beginners. **Library Usage** None of the approaches use any external libraries in this benchmark. **Special JS Features/Syntax** The `spread` operator (`...`) is used in two approaches, which is a modern JavaScript feature introduced in ECMAScript 2015 (ES6). The `push` method with spread is also a relatively recent addition to JavaScript, introduced in ECMAScript 2019 (ES10). **Alternative Approaches** Some alternative approaches could include: * Using the `Array.prototype.reduce()` method to concatenate arrays. * Utilizing specialized libraries like Lodash or Ramda for array manipulation. * Leveraging browser-specific features like WebAssembly or SIMD instructions for optimized performance. Keep in mind that each approach has its trade-offs, and the best solution depends on the specific requirements of your project.
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