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Push vs Map mastermind 2
(version: 0)
Comparing performance of:
Push vs Join
Created:
2 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var strs = Array.from(new Array(100)).map(() => ({a: 2, b: 10})) var result = []
Tests:
Push
for (let i = 0; i < strs.length; i++) { if (i > 50) continue result.push(strs[i]) }
Join
result = strs.map((a, i) => i > 50 ? null : a).filter(Boolean)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Push
Join
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 Definition** The benchmark is called "Push vs Map mastermind 2". It compares two different approaches to iterating over an array and adding elements to another array. **Script Preparation Code** This code initializes two arrays: 1. `strs`: An array of 100 objects, each with properties `a` and `b`. 2. `result`: An empty array that will be populated with elements from `strs`. **Individual Test Cases** There are two test cases: ### Push * **Benchmark Definition**: A `for` loop iterates over the `strs` array. + If the current index `i` is greater than 50, the loop skips to the next iteration (using `continue`). + Otherwise, it adds the current element from `strs` to the `result` array using `push`. * **Test Name**: "Push" ### Join * **Benchmark Definition**: The `map()` method creates a new array by iterating over `strs`. + For each element `a` at index `i`, it returns `null` if `i` is greater than 50. Otherwise, it returns the original element `a`. + The resulting array from `map()` is then passed to the `filter(Boolean)` method. + This effectively removes any null values from the array, leaving only the elements that were not skipped (i.e., those at indices <= 50). * **Test Name**: "Join" **Latest Benchmark Result** The test results show that: * The "Join" approach is faster than the "Push" approach on a Chrome browser with Windows OS. **Library/Feature Used** No external libraries are used in these test cases. However, the `Array.from()` method and the arrow function syntax (`(a, i) => ...`) are used to create a new array from an existing one and define the callback functions for `map()`, respectively. **Pros and Cons of Each Approach** 1. **Push**: This approach has a time complexity of O(n), where n is the length of the array being iterated over. * Pros: Easy to implement, straightforward logic. * Cons: May be slower than other approaches if the array is very large or if many elements are skipped. 2. **Join (Map-Filter)**: This approach also has a time complexity of O(n), but it can take advantage of JavaScript's built-in `map()` and `filter()` methods. * Pros: Can be faster than "Push" in some cases, especially when working with large arrays or skipping many elements. * Cons: Requires a good understanding of the method chaining syntax (`map()` followed by `filter()`). **Other Alternatives** Other approaches to consider: 1. **For...of loop**: Instead of using `for (let i = 0; i < strs.length; i++)`, you can use `for (const str of strs)` to iterate over the array. 2. **Reduce() method**: If you need to accumulate results, you can use the `reduce()` method to iterate over the array and build up a result. These alternatives have their own pros and cons, but they can be useful depending on your specific use case.
Related benchmarks:
Foreach&Push vs Map2
For Push vs Map
spread vs push 3
Push vs Map mastermind
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