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Push vs Apply/Map
(version: 0)
Comparing performance of:
Push vs Map
Created:
3 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var strs = Array.from(new Array(1000)).map(() => 'String concat. ') var result = []
Tests:
Push
for (let i = 0; i < strs.length; i++) { result.push(strs[i]) }
Map
result = Array.apply(null, Array(strs.length)).map(function (x, i) { return strs[i]; })
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Push
Map
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'd be happy to explain the provided benchmark and its test cases. **Benchmark Overview** The provided JSON represents a JavaScript microbenchmarking test case on MeasureThat.net. The test compares two approaches: using `push()` with arrays, versus using `apply()`, `map()`, or a custom implementation (not shown in the code snippet). **Test Cases** There are two individual test cases: ### Test Case 1: "Push" This test case measures the performance of pushing elements onto an array using the `push()` method. ```javascript for (let i = 0; i < strs.length; i++) { result.push(strs[i]); } ``` **Pros and Cons** * **Efficient**: The `push()` method is a built-in JavaScript method that efficiently appends elements to an array. It's a straightforward and well-optimized way to add new elements. * **Easy to Understand**: The code is simple, easy to read, and follows standard JavaScript syntax. However, there might be some issues with cache locality or branch prediction for certain implementations of `push()` on specific browsers (e.g., Safari). Also, since the push method modifies the internal buffer of an array, pushing multiple values can lead to inefficient memory allocation. In theory, using a custom implementation could potentially mitigate these issues. ### Test Case 2: "Map" This test case measures the performance of applying `map()` to an array with a callback function that returns a new value for each element. ```javascript result = Array.apply(null, Array(strs.length)).map(function (x, i) { return strs[i]; }); ``` **Pros and Cons** * **Efficient**: The `Array.prototype.map()` method is also optimized for performance. It creates a new array with the results of applying the provided callback function to each element. * **Flexible**: You can use it with any iterable (including functions) as the first argument. However, this implementation uses `apply()`, which has some overhead due to its flexibility and usage in many contexts. Also, creating an intermediate array on the heap using a custom implementation could be beneficial if you are concerned about performance or memory consumption. **Library/Function Usage** The provided code snippet uses two libraries/functions: * None: The provided script only utilizes built-in JavaScript functions (`Array`, `push()`, `map()`), and does not include any third-party library. Other alternatives to test cases would be using other methods for array manipulation such as `unshift()`, `splice()`, or custom implementations that use different data structures (e.g., linked lists). **Special JS Feature/Syntax** There is no special JavaScript feature or syntax used in this benchmark. The code snippet only uses standard, built-in JavaScript functions and does not include any advanced features like async/await, Promises, or modern ES6+ syntax. In summary, this benchmark compares the performance of two common array manipulation methods in JavaScript: `push()` with arrays versus using `map()`. Both approaches have their pros and cons, and understanding these can help developers optimize their own code for performance.
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