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Underscore.js _forEach() vs Native for loop for large arrays (rewrite)
(version: 0)
This will compare the native for loop speed vs the underscore _forEach() on a relatively large array.
Comparing performance of:
Underscore.js _forEach() vs native for loop
Created:
3 years ago
by:
Guest
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HTML Preparation code:
<script src='https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.6.0/underscore-min.js'></script>
Script Preparation code:
var values = [{a: 30310}, {b: 100303}, {c: 3040494}]
Tests:
Underscore.js _forEach()
var count = 0; _.forEach(values, function(value) { if (value.a != null) { count++; } });
native for loop
var count = 0; for (var i = 0; i < values.length; i++) { if (values[i].a != null) { count++; } }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
Underscore.js _forEach()
native for loop
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down what's being tested in this benchmark. **What is being tested?** The test case compares the performance of two approaches: using Underscore.js `_forEach()` and a native `for` loop on large arrays. Specifically, it tests how many times the code executes the condition inside the loop (in this case, `value.a != null`) for each value in the array. **Options compared** The two options being compared are: 1. **Underscore.js `_forEach()`**: A function from the popular utility library Underscore.js that iterates over arrays and objects. 2. **Native `for` loop**: A basic looping construct in JavaScript that uses an index variable to iterate over array elements. **Pros and cons of each approach** **Underscore.js `_forEach()`** Pros: * Easier to read and write, as it abstracts away low-level details * More concise code * Can be more efficient for large datasets, since Underscore.js can handle indexing and bounds checking internally Cons: * Adds an external dependency (the Underscore.js library) * May introduce overhead due to the need to call the `_forEach()` function on each element * Limited control over iteration details (e.g., skipping elements) **Native `for` loop** Pros: * Lightweight, no external dependencies required * Provides fine-grained control over iteration details (e.g., skipping elements) * Faster execution for small arrays or simple iterations Cons: * More verbose code * Requires manual indexing and bounds checking **Library: Underscore.js** Underscore.js is a popular utility library that provides various functions for functional programming, data manipulation, and more. The `_forEach()` function is one of its most commonly used methods, allowing you to iterate over arrays and objects in a concise way. **Special JS feature/syntax** There are no special JavaScript features or syntax mentioned in this benchmark. Now, let's take a look at the individual test cases: 1. **Underscore.js `_forEach()`**: This code uses Underscore.js `_forEach()` to iterate over the `values` array and increment a counter for each element where `value.a != null`. 2. **Native `for` loop**: This code uses a traditional `for` loop to iterate over the `values` array, incrementing a counter for each element where `value.a != null`. **Other alternatives** For large-scale iterations, other approaches you might consider include: * Using modern JavaScript features like `Array.prototype.forEach()` or `for...of` * Leveraging libraries like Lodash (which provides a more extensive set of iteration utilities) * Utilizing parallel processing or multi-threading techniques for extreme performance-critical scenarios However, for most use cases, the choice between `_forEach()` and a native `for` loop ultimately depends on personal preference, project requirements, and performance considerations.
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