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conact vs push
(version: 0)
Comparing performance of:
concat vs push vs spread
Created:
7 years ago
by:
Guest
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Tests:
concat
const arr = [...new Array(1000)].map((val, key) => key); const arr2 = [...new Array(1000)].map((val, key) => key); arr.concat(arr2);
push
const arr = [...new Array(1000)].map((val, key) => key); const arr2 = [...new Array(1000)].map((val, key) => key); arr.push(...arr2);
spread
let arr = [...new Array(1000)].map((val, key) => key); const arr2 = [...new Array(1000)].map((val, key) => key); arr = [...arr, ...arr2]
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
concat
push
spread
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Benchmark Overview** The provided benchmark compares the performance of three different methods for concatenating arrays in JavaScript: `concat()`, `push()` with the spread operator (`...`), and assigning using the spread operator. **Test Case 1: concat()** * The first test case creates two identical arrays, `arr` and `arr2`, each containing 1000 elements. It then uses the `concat()` method to concatenate these two arrays. * The goal is to measure how fast `concat()` can concatenate two arrays in JavaScript. **Test Case 2: push() with Spread Operator** * Similar to the first test case, this test creates two identical arrays, `arr` and `arr2`, each containing 1000 elements. However, instead of using the `concat()` method, it uses the spread operator (`...`) to concatenate the two arrays. * The goal is to measure how fast the spread operator can concatenate two arrays in JavaScript. **Test Case 3: Assigning with Spread Operator** * In this test case, a single array `arr` is created and assigned a value using the spread operator (`...`). Another identical array `arr2` is then created and assigned to `arr` again. * The goal is to measure how fast assigning using the spread operator can concatenate two arrays in JavaScript. **Comparison of Options** Here's a brief comparison of the three approaches: 1. **concat()**: This method uses the `concat()` function to join two or more arrays into one array. It creates new arrays and copies elements from one array to another. * Pros: Simple, widely supported, and easy to read. * Cons: Creates new arrays, which can be memory-intensive for large datasets. 2. **push() with Spread Operator**: This method uses the spread operator (`...`) to concatenate two arrays into a single array. * Pros: More efficient than `concat()` as it creates fewer objects, and avoids unnecessary copies of elements. * Cons: Requires modern JavaScript versions (ECMAScript 2015+) and can be less readable for some developers. 3. **Assigning with Spread Operator**: This method assigns the spread operator to assign one array to another, effectively concatenating them. * Pros: Can be more efficient than `concat()` or push() with spread operator, as it modifies the existing array in place. * Cons: Requires modern JavaScript versions (ECMAScript 2015+) and can be less readable for some developers. **Library Used** The benchmark does not use any external libraries. The code only uses built-in JavaScript features to create and manipulate arrays. **Special JS Features or Syntax** None of the test cases use any special JavaScript features or syntax that would require additional explanation beyond their functionality. **Other Alternatives** If you're looking for alternative approaches, here are a few: 1. **Array.prototype.reduce()**: This method can be used to concatenate arrays by reducing them into a single value. 2. **Array.prototype.set()**: Although not widely supported, this method allows assigning an array to another array in place. 3. **Array.prototype.push().slice()**: Another approach is using `push()` followed by slicing the resulting array. Keep in mind that each of these alternatives may have performance or readability implications compared to the original three approaches tested in the benchmark.
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