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Array.prototype.concat vs spread operator (1)
(version: 0)
Compare the new ES6 spread operator with the traditional concat() method
Comparing performance of:
Array.prototype.concat vs spread operator
Created:
6 years ago
by:
Registered User
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Script Preparation code:
var arr1 = []; var arr2 = []; for(let i = 0; i < 1000; i++) { arr1.push(i); arr2.push(i); }
Tests:
Array.prototype.concat
[].concat(arr1, arr2);
spread operator
[...arr1, ...arr2];
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Array.prototype.concat
spread operator
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net. The provided JSON represents a benchmark test case that compares the performance of two methods for concatenating arrays: `Array.prototype.concat` and the new ES6 spread operator (`...`). We'll break down what's being tested, the pros and cons of each approach, and some additional considerations. **What is being tested?** In this test case, we're measuring the execution time of two different ways to concatenate two arrays: 1. Using the traditional `Array.prototype.concat` method: `[arr1, arr2]`. 2. Using the spread operator (`...`) with array destructuring: `[...arr1, ...arr2]`. **Options compared** The main options being compared are: * Traditional concatenation using `Array.prototype.concat` * Modern array concatenation using the spread operator **Pros and Cons of each approach** **Traditional Concatenation (Array.prototype.concat)** Pros: * Wide browser support (has been around for a long time) * Easy to understand and implement * Works with older browsers that don't support the spread operator Cons: * Can lead to performance issues due to the creation of an intermediate array * Less efficient than modern alternatives **Modern Array Concatenation (Spread Operator)** Pros: * More efficient than traditional concatenation, as it avoids creating an intermediate array * Works with modern browsers and JavaScript engines Cons: * Requires support for the spread operator in older browsers * Can be less intuitive for some developers who are not familiar with this syntax **Library usage** The library being used is the JavaScript engine itself. The benchmark tests the built-in `Array.prototype.concat` method and the spread operator, which are part of the standard JavaScript language. **Special JS feature or syntax** This test case uses the new ES6 spread operator (`...`) syntax, which was introduced in 2015 as a part of ECMAScript 2015 (ES6). The spread operator allows for efficient array creation and manipulation. **Other alternatives** If you wanted to test other approaches for array concatenation, some alternatives could include: * Using the `Array.prototype.push()` method with two separate calls: `arr1.push(...arr2)` * Using a library like Lodash's `concat` function * Using a specialized array concatenation algorithm However, it's worth noting that these alternative approaches may not be as efficient or widely supported as the traditional concatenation method. **Benchmark preparation code** The benchmark preparation code creates two empty arrays (`arr1` and `arr2`) and then populates them with 1000 elements using a `for` loop. This ensures that both the spread operator and the traditional concatenation method are performing array concatenations of similar size, making the comparison more meaningful. **Latest benchmark result** The latest benchmark results show that Chrome 80 on Windows Desktop outperforms the spread operator by approximately 4x, while executing at a rate of around 661,989 executions per second. This suggests that traditional concatenation using `Array.prototype.concat` remains a reliable and efficient option for array concatenation in modern browsers.
Related benchmarks:
concat 2 arrays: Array.prototype.concat vs spread operator
Array.prototype.concat vs spread operator - small arrays
Array.prototype.concat vs spread operator - larger arrays
Array concat vs spread operator vs push for single values
Array.prototype.concat vs spread operator (new try)
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