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lodash forEach vs for i loop with length cached vs Array#forEach vs Array#map (big array 1e4)
(version: 0)
Comparing performance of:
lodash.forEach vs native vs Array#forEach vs Array#map
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 = Array.from({length: 1e4}).map((v, i) => ({ [String.fromCharCode(Math.random() * 26 + 97)]: Math.random(10000) }))
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++; } })
Array#map
var count = 0; values.map(function(v,i) { if (v.a != null) { count++; } })
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (4)
Previous results
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Test case name
Result
lodash.forEach
native
Array#forEach
Array#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):
Let's dive into the Benchmark Definition and test cases. **Overview** The provided benchmark, MeasureThat.net, tests four approaches to iterating over an array in JavaScript: 1. Lodash `forEach` 2. Native `for` loop with length caching 3. Array `.forEach()` method 4. Array `.map()` method Each approach is compared against the others to determine which one is the most efficient. **Approaches and their characteristics** ### 1. Lodash `forEach` * Library: Lodash (a utility library for functional programming) * Purpose: Provides a concise way to iterate over an array, applying a function to each element. * Pros: + Concise syntax + Easy to use and understand + Works with both arrays and objects * Cons: + Adds additional overhead due to the library's functionality ### 2. Native `for` loop with length caching * Purpose: Uses a traditional `for` loop to iterate over an array, taking advantage of caching the array's length. * Pros: + Fastest execution speed among all approaches + Simple and familiar syntax for many developers + No additional overhead beyond the basic `for` loop functionality * Cons: + Requires manual indexing and bounds checking + May require more code to achieve the same result as other approaches ### 3. Array `.forEach()` * Purpose: A built-in method for iterating over an array, applying a function to each element. * Pros: + Fast execution speed (similar to native `for` loop) + Simple and concise syntax + Easy to use and understand * Cons: + May have slight overhead due to the browser's or interpreter's implementation ### 4. Array `.map()` * Purpose: A built-in method for transforming an array by applying a function to each element. * Pros: + Fast execution speed (similar to native `for` loop) + Simple and concise syntax + Easy to use and understand * Cons: + Not designed for iteration only, but can be adapted for that purpose **Special considerations** In this benchmark, no special JavaScript features or syntax are used beyond the basic language features. However, the use of Lodash library in one of the test cases introduces additional complexity. **Other alternatives** If you're interested in exploring alternative approaches to iterating over arrays in JavaScript, consider: * Using `reduce()` instead of `forEach()` * Implementing your own iterator using a `for...of` loop and caching the array's length * Utilizing Web Workers for concurrent processing * Leveraging modern frameworks or libraries (e.g., React, Angular) that optimize array iteration Keep in mind that each approach has its trade-offs, and the best choice depends on your specific use case and performance requirements. I hope this explanation helps!
Related benchmarks:
lodash foreach vs for-of vs forEach
native for loop vs Array.prototype.forEach vs lodash forEach
lodash vs for-of vs forEach vs map v2
lodash.foreach vs for-of vs array.forEach
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