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JavaScript Array.prototype.map vs loop+Array.prototype.push ( big array )
(version: 0)
JavaScript Array.prototype.map vs loop+Array.prototype.push compare for big array
Comparing performance of:
map vs for push
Created:
3 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var length = 10000000 var data = []; for (let i = 0; i < length; i++) data.push(i);
Tests:
map
data.map((val) => val * val);
for push
var zzz = []; for (var e of data) zzz.push(e * e);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
map
for push
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 break down the provided benchmark and explain what is being tested, compared, and the pros and cons of each approach. **Benchmark Overview** The benchmark compares two approaches to perform an array operation on a large dataset: 1. Using `Array.prototype.map()` method 2. Using a loop with `Array.prototype.push()` method **Options Compared** * `map()` vs `for push` (manual loop) **Pros and Cons of Each Approach:** * **`map()` Method:** + Pros: - Concise and expressive code - Efficient, as it uses optimized C++ implementation under the hood - Supports parallel execution in some browsers + Cons: - Can be slower due to the overhead of function calls and object lookups - Not suitable for very large arrays, as it may cause stack overflows or memory issues * **`for push` (Manual Loop) Method:** + Pros: - Can be faster for very large arrays, as it avoids the overhead of function calls and object lookups - More control over the execution flow + Cons: - Code can become verbose and harder to read - May lead to more errors due to manual memory management **Library Used:** The `map()` method uses the Array.prototype object, which is a part of the JavaScript Standard Library. It provides a way to perform an operation on each element of an array without modifying the original array. **Special JS Feature/Syntax:** No special JavaScript features or syntax are used in this benchmark. The focus is solely on comparing two different approaches to performing an array operation. **Other Alternatives:** * **Using `forEach()` method:** This approach would be similar to the `for push` method, but with a more concise syntax. * **Using `reduce()` method:** This approach would be suitable for calculating aggregate values from the array elements. * **Using `filter()` method:** This approach would be suitable for filtering out certain elements from the array. **Benchmark Preparation Code Explanation:** The preparation code creates an array of 10 million elements, each with a value from 0 to 9.999999999 (to avoid floating-point precision issues). The code then pushes these values into another array using the `for push` method. **Individual Test Cases:** Each test case measures the execution time of one approach: 1. **`map()` Method:** Measures the execution time of the `data.map((val) => val * val)` expression. 2. **`for push` (Manual Loop) Method:** Measures the execution time of the `var zzz = []; for (var e of data) zzz.push(e * e);` code. The benchmark uses two test cases: one for each approach, with identical input data and execution context.
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