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Array concat comparison between spread concat and push
(version: 0)
Comparing performance of:
spread vs concat vs push
Created:
6 years ago
by:
Guest
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Script Preparation code:
var t1 = [1,2,3,4,5,6,7,8,9,0]; var t2 = ['a', 'b', 'c', 'd', 'e'];
Tests:
spread
const c = [...t1, ...t2];
concat
const c = t1.concat(t2);
push
t1.push(...t2); const c= t1;
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):
Let's break down what's being tested in this JavaScript microbenchmark. **Benchmark Definition** The benchmark is designed to compare three approaches for concatenating arrays: 1. Spread operator (`...`): `const c = [...t1, ...t2];` 2. `concat()` method: `const c = t1.concat(t2);` 3. `push()` method with spread operator (`...`): `t1.push(...t2); const c= t1;` **Options Compared** The benchmark is comparing the performance of these three approaches: * **Spread Operator**: Using the spread operator to concatenate arrays. This approach is relatively new and has gained popularity in recent years due to its concise syntax. * **`concat()` Method**: Using the `concat()` method, which is a built-in array method that concatenates two or more arrays. * **`push()` Method with Spread Operator**: Using the `push()` method with the spread operator (`...`). This approach combines the benefits of both methods. **Pros and Cons** Here's a brief summary of each approach: * **Spread Operator**: + Pros: Concise syntax, easy to read and write, efficient. + Cons: May not be as well-supported in older browsers or versions of JavaScript. * **`concat()` Method**: + Pros: Well-established and widely supported, reliable performance. + Cons: Can be less readable than the spread operator due to its method call syntax. * **`push()` Method with Spread Operator**: + Pros: Combines benefits of both methods (convenience and efficiency). + Cons: May have slightly higher overhead due to the `push()` method call. **Library Usage** None of the test cases use any external libraries. **Special JS Features or Syntax** The benchmark uses a few modern JavaScript features: * Spread operator (`...`): This feature was introduced in ECMAScript 2015 (ES6) and allows for concise syntax when concatenating arrays. * Template literals (`\r\n`): While not exclusive to JavaScript, template literals are used in the script preparation code to create a multi-line string. **Other Alternatives** If you're looking for alternative approaches to concatenate arrays, you could consider: * Using `Array.prototype.push.apply()` method: This method applies the spread operator's behavior to an array by passing it as an argument. * Using `Array.prototype.reduce()` method: This method can be used to concatenate arrays in a more functional programming style. Keep in mind that these alternatives may have slightly different performance characteristics and readability implications compared to the approaches tested in this benchmark.
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