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Push vs Concat
(version: 3)
Comparing performance of:
Push 1 vs Concat 1 vs Push 5 vs Concat 5 vs Push 10 vs Concat 10 vs Push 20 vs Concat 20
Created:
9 years ago
by:
Registered User
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Tests:
Push 1
var arr = [1, 2, 3, 4, 5]; arr.push.apply(arr, [6])
Concat 1
var arr = [1, 2, 3, 4, 5]; arr = arr.concat([6])
Push 5
var arr = [1, 2, 3, 4, 5]; arr.push.apply(arr, new Array(5).fill(0))
Concat 5
var arr = [1, 2, 3, 4, 5]; arr.concat(new Array(5).fill(0))
Push 10
var arr = [1, 2, 3, 4, 5]; arr.push.apply(arr, new Array(10).fill(0))
Concat 10
var arr = [1, 2, 3, 4, 5]; arr.concat(new Array(10).fill(0))
Push 20
var arr = [1, 2, 3, 4, 5]; arr.push.apply(arr, new Array(20).fill(0))
Concat 20
var arr = [1, 2, 3, 4, 5]; arr.concat(new Array(20).fill(0))
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (8)
Previous results
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Test case name
Result
Push 1
Concat 1
Push 5
Concat 5
Push 10
Concat 10
Push 20
Concat 20
Fastest:
N/A
Slowest:
N/A
Latest run results:
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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. **Benchmark Definition** The benchmark definition is simply a JSON object that contains the code for a specific test case. In this case, we have two approaches to add an array to an existing array: using `push.apply()` and using `concat()`. The script preparation code and HTML preparation code are empty, which means that the browser's JavaScript engine will handle these operations. **Options Compared** We're comparing the performance of two approaches: 1. **`push.apply()`**: This method uses the `apply()` method to call the `push()` method on an array with multiple arguments. 2. **`concat()`**: This method creates a new array by concatenating another array. **Pros and Cons of Each Approach** * **`push.apply()`**: + Pros: More explicit, can be faster in some cases due to tail call optimization (not applicable here since we're using `apply()`, but still). + Cons: Can lead to slower performance if the `push()` method is optimized to avoid unnecessary copies. * **`concat()`**: + Pros: Creates a new array, which can be faster in some cases due to better caching and locality of reference. + Cons: Can lead to slower performance if the resulting array is large and needs to be allocated. **Library Usage** There doesn't seem to be any explicit library usage in these benchmark definitions. However, it's worth noting that MeasureThat.net likely uses a framework or library under the hood to execute the JavaScript code and measure its performance. **Special JS Features/Syntax** None of the test cases use special JavaScript features or syntax beyond what is standard for modern JavaScript engines (ECMAScript 2015+). **Alternatives** If you want to explore alternative approaches, here are some options: 1. **`Array.prototype.push()`**: This method pushes an element onto the end of the array and returns the new length of the array. 2. **`Set()`**: A modern JavaScript data structure that can be used to add elements to an array without modifying its original order. 3. **`Array.from()`**: A method that creates a new array from an iterable or an array-like object. Keep in mind that these alternatives might not have the same performance characteristics as `push.apply()` and `concat()`, depending on the specific use case and browser/ engine implementation.
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