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_concat vs _push vs _spread
(version: 0)
Comparing performance of:
spread vs push vs concat
Created:
2 years ago
by:
Guest
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Tests:
spread
let arr1 = (new Array(1000000)).fill("hello world"); arr1 = [...arr1, "hello world"]
push
let arr1 = (new Array(1000000)).fill("hello world"); arr1.push("hello world")
concat
let arr1 = (new Array(1000000)).fill("hello world"); arr1.concat("hello world");
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
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Test case name
Result
spread
push
concat
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! **What is being tested?** The provided JSON represents three test cases that compare the performance of different approaches for concatenating arrays in JavaScript: 1. `_concat` (using the `concat()` method) 2. `_push` (using the `push()` method) 3. `_spread` (using the spread operator `...`) These test cases aim to measure which approach is the fastest and most efficient. **Options compared:** The three options being compared are: 1. **_concat**: Using the `concat()` method to concatenate an array with another value. 2. **_push**: Using the `push()` method to add a single element to the end of an array. 3. **_spread`: Using the spread operator `...` to create a new array by spreading the elements of an existing array and adding a new value. **Pros and cons of each approach:** 1. **_concat_**: * Pros: Can be more intuitive for some developers, as it directly modifies the original array. * Cons: Creates a new array and can lead to unnecessary memory allocations. 2. **_push_**: * Pros: Efficiently adds an element to the end of an array without creating a new array. * Cons: Can be slower than `_concat` due to the overhead of pushing elements onto the array. 3. **_spread_**: * Pros: Creates a new array and can lead to less memory fragmentation compared to `_concat`. * Cons: May be less intuitive for some developers, as it requires understanding of spread operators. **Library usage:** None of the test cases use any external libraries, so there are no additional dependencies to consider. **Special JS features or syntax:** The spread operator `...` is used in the `_spread` test case. This feature was introduced in ECMAScript 2015 (ES6) and allows creating new arrays by spreading elements from an existing array. **Other alternatives:** While not explicitly mentioned, other approaches for concatenating arrays could be considered, such as: 1. Using `Array.prototype.push.apply()` 2. Creating a new array using the `Array.from()` method 3. Using a library like Lodash's `concat` function However, these alternatives are not being tested in this specific benchmark. **Benchmark preparation code:** The script preparation code is empty, which means that no additional setup or initialization is required for each test case.
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