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lodash forEach vs for i loop with length cached vs Array#forEach
(version: 0)
Comparing performance of:
lodash.forEach vs native vs Array#forEach
Created:
6 years ago
by:
Guest
Jump to the latest result
HTML Preparation code:
<script src="https://cdn.jsdelivr.net/lodash/4.16.0/lodash.min.js"></script>
Script Preparation code:
var values = [{a: 30310}, {b: 100303}, {c: 3040494}]
Tests:
lodash.forEach
var count = 0; _.forEach(values, function(v,i) { if (v.a != null) { count++; } })
native
var count = 0; for (var i = 0, len = values.length; i < len; i++) { if (values[i].a != null) { count++; } }
Array#forEach
var count = 0; values.forEach(function(v,i) { if (v.a != null) { count++; } })
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
lodash.forEach
native
Array#forEach
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 help you understand the provided benchmark. **Benchmark Overview** The benchmark compares three approaches for iterating over an array of objects in JavaScript: 1. `lodash.forEach` 2. A native `for` loop with length caching 3. The built-in `Array#forEach` method **Options Compared** Here's a brief overview of each option: * **Lodash `forEach`**: A popular utility library that provides a convenient way to iterate over arrays and objects. + Pros: Convenient, easy to use, widely adopted. + Cons: Adds external dependency (lodash), can be slower due to function call overhead. * **Native `for` loop with length caching**: A low-level approach that uses a traditional `for` loop to iterate over the array. + Pros: No external dependencies, potentially faster due to less function call overhead. + Cons: Requires manual memory management (length caching), can be more error-prone. * **Array#forEach**: The built-in method for iterating over arrays in JavaScript. + Pros: Native implementation, no external dependencies, concise syntax. + Cons: May not be as efficient as a native `for` loop or lodash's implementation. **Library - Lodash** Lodash is a popular utility library for JavaScript that provides a wide range of functions for working with data structures, including arrays and objects. In this benchmark, the `forEach` method is used to iterate over an array of objects. Lodash adds a small overhead due to function call and object creation. **JavaScript Special Feature - Iterators** The `Array#forEach` method uses an iterator to iterate over the array. An iterator is an object that allows iteration over a collection of values, providing both the current value and its index (in this case). The use of an iterator enables efficient iteration over large arrays without creating intermediate arrays. **Benchmark Preparation Code** The script preparation code creates an array of three objects with properties `a`, `b`, and `c`. The benchmark uses this array as input for each test case. **Test Case 1: Lodash `forEach`** This test case iterates over the array using lodash's `forEach` method. It increments a counter (`count`) whenever it encounters an object with a non-null value in property `a`. **Test Case 2: Native `for` loop with length caching** This test case uses a traditional `for` loop to iterate over the array. The `length` property of the array is cached for each iteration, reducing overhead due to array lookups. **Test Case 3: Array#forEach** This test case uses the built-in `Array#forEach` method to iterate over the array. It increments a counter (`count`) whenever it encounters an object with a non-null value in property `a`. **Other Alternatives** Some other approaches for iterating over arrays in JavaScript include: * Using the `map()` or `reduce()` methods, which are more suitable for transforming data rather than iterating. * Using a `while` loop, which can be more efficient but requires manual memory management. * Using an external library like jQuery, which provides its own iteration methods (e.g., `.each()`).
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