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spread vs concat vs apply on large data set - 2
(version: 1)
Large data set is the difference
Comparing performance of:
array spread vs array concat vs array push apply vs array spread in a push
Created:
7 years ago
by:
Registered User
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Tests:
array spread
const arr = [] for(i=0;i<10000;i++){ arr.push(i); } const arr2 = [1,2]; const newArray = [1,2,...arr]
array concat
const arr = [] for(i=0;i<10000;i++){ arr.push(i); } const arr2 = [1,2]; const newArray = arr2.concat(arr)
array push apply
const arr = [] for(i=0;i<10000;i++){ arr.push(i); } const arr2 = [1,2]; const newArray = arr2.push.apply(arr2, arr)
array spread in a push
const arr = [] for(i=0;i<10000;i++){ arr.push(i); } const arr2 = [1,2]; const newArray = arr2.push(...arr)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (4)
Previous results
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Test case name
Result
array spread
array concat
array push apply
array spread in a push
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.1:latest
, generated one year ago):
Let's break down the benchmark test cases. **Benchmark Purpose** The goal of these tests is to compare the performance of three different ways to concatenate (combine) two large arrays in JavaScript: using the `spread` operator (`...`), the `concat()` method, and the `apply()` method with `push()`. The test case also includes an additional variation that uses the spread operator within a `push()` call. **Test Case Descriptions** Here's a brief overview of each test case: 1. **Array Spread**: Creates two large arrays (one with 10000 elements) and combines them using the spread operator (`...`) to create a new array. 2. **Array Concat**: Similar to the first test, but uses the `concat()` method to combine the two arrays. 3. **Array Push Apply**: This test creates a large array and uses the `apply()` method with `push()` to add elements from another array. However, it's worth noting that `apply()` is not typically used in this way, and its use here might be considered an edge case or a testing contrivance. 4. **Array Spread in a Push**: This test combines the spread operator with a push operation to add elements from one array to another. **Results Analysis** The latest benchmark results show the execution speed (measured as Executions Per Second) for each test case on Chrome 110 browser: 1. Array Concat: ~23571 executions per second 2. Array Spread in a Push: ~15329 executions per second 3. Array Push Apply: ~15224 executions per second 4. Array Spread: ~12844 executions per second **Interpretation** The results indicate that the `concat()` method is significantly faster than using the spread operator or applying/pushing elements individually. **Pros and Cons of each approach** 1. **Array Concat**: Pros: Fastest performance in this benchmark; Cons: May be slower if you're pushing elements one by one. 2. **Array Spread**: Pros: Easy to read and write, especially when spreading multiple arrays or objects; Cons: Slower than concat(), may use more memory. 3. **Array Push Apply**: Not a typical use case for `apply()`; might be considered an edge case. **Alternatives** Other alternatives to concatenate arrays include: * Using the `push()` method with individual elements, but this would be slower than using `concat()` or spread operators. * Using ES6's `Set` and spreading it into an array (not shown in these tests), which might offer better performance for large datasets. **Library Usage** No external libraries are used in these test cases. **Special JS Feature or Syntax** The test case uses the spread operator (`...`) to combine arrays, as well as ES5's `apply()` method with `push()`. The latest test also utilizes the spread operator within a `push()` call.
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