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lodash forEach vs for i loop vs native for i in
(version: 0)
Comparing performance of:
lodash.forEach vs native vs native for i in
Created:
5 years ago
by:
Guest
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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; i < values.length; i++) { if (values[i].a != null) { count++; } }
native for i in
var count = 0; for (var i in values) { if (values[i].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
native for i in
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 dive into the benchmark analysis. **Benchmark Purpose** The goal of this benchmark is to compare the performance of three different approaches: 1. Lodash `forEach` method 2. Native `for` loop with indexing (using `values.length` and `i`) 3. Native `for...in` loop These approaches are compared for their execution speed in iterating over an array (`values`) and executing a condition on each element. **Options Compared** The benchmark compares the performance of three options: 1. **Lodash `forEach` method**: This is a utility function from the Lodash library that iterates over an array using a callback function. 2. **Native `for` loop with indexing**: This approach uses a traditional `for` loop to iterate over the array indices, accessing each element using its index (`values[i]`). 3. **Native `for...in` loop**: This approach uses the older `for...in` syntax, which iterates over an object's properties (in this case, the array elements). Note that `for...in` is not as efficient as traditional `for` loops for arrays. **Pros and Cons of Each Approach** 1. **Lodash `forEach` method**: * Pros: Easy to use, concise code, and often faster than native implementations due to its optimized internal logic. * Cons: Requires the Lodash library, which may introduce additional overhead. 2. **Native `for` loop with indexing**: * Pros: Fastest approach, as it uses a traditional `for` loop with direct access to array elements. * Cons: May require more code and is less readable than the Lodash `forEach` method. 3. **Native `for...in` loop**: * Pros: Simple to implement and can be faster for small arrays. * Cons: Less efficient than traditional `for` loops due to the overhead of iterating over object properties. **Library Used** In this benchmark, Lodash is used as a utility library. The `lodash.min.js` script is included in the HTML file using a CDN link (`https://cdn.jsdelivr.net/lodash/4.16.0/lodash.min.js`). This allows users to easily run the benchmark with and without Lodash. **Special JavaScript Features or Syntax** In this benchmark, no special JavaScript features or syntax are used beyond what's standard for arrays and `for` loops. There are no experimental features like async/await, promise chaining, or arrow functions. **Alternatives** If you want to compare other approaches, consider the following alternatives: * Other utility libraries (e.g., jQuery, underscore.js) that offer similar `forEach` methods. * Modern JavaScript array methods (e.g., `map()`, `filter()`) for iterating over arrays. * Using `Set` or `Map` data structures instead of arrays for faster lookups. * Implementing custom iteration logic using recursive functions or `for...of` loops. Keep in mind that each alternative will have its own trade-offs and performance characteristics, so be sure to test and benchmark them as needed.
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