Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
Array loop vs foreach vs map144415214
(version: 0)
Comparing performance of:
foreach vs for vs map
Created:
5 years ago
by:
Guest
Jump to the latest result
HTML Preparation code:
<script src=''></script>
Script Preparation code:
var arr = []; for (var i = 0; i < 10000; i++) { arr[i] = i; } function someFn(i) { return i * 3 * 8; }
Tests:
foreach
arr.forEach(function (item){ someFn(item); })
for
for (var i = 0, len = arr.length; i < len; i++) { someFn(arr[i]); }
map
arr.map(item => someFn(item))
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
Fork
Test case name
Result
foreach
for
map
Fastest:
N/A
Slowest:
N/A
Latest run results:
No previous run results
This benchmark does not have any results yet. Be the first one
to run it!
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the benchmark and its test cases. **Benchmark Overview** The benchmark measures the performance of three approaches to iterate over an array: `forEach`, `for` loop, and `map`. The test case is designed to compare the execution speed of these approaches on a large array of 10,000 elements. **Test Case 1: `foreach`** In this test case, the `forEach` method is used to iterate over the array. The callback function `someFn(i)` is executed for each element in the array. The purpose of this test is to measure the overhead of using a functional programming approach to iterate over an array. **Pros and Cons:** * Pros: + Easy to understand and implement + Encourages a declarative programming style * Cons: + May have higher overhead due to function call and context switching **Test Case 2: `for` loop** In this test case, a traditional `for` loop is used to iterate over the array. The loop variable `i` is incremented manually for each iteration. Pros and Cons: * Pros: + Typically faster than functional programming approaches + Easy to understand and implement * Cons: + Requires manual incrementing of the loop variable, which can be error-prone **Test Case 3: `map`** In this test case, the `map` method is used to create a new array by applying the `someFn(i)` function to each element in the original array. Pros and Cons: * Pros: + Encourages a declarative programming style + Can be faster than traditional loops for certain use cases * Cons: + May have higher overhead due to function call and memory allocation **Library Used:** In all three test cases, the `someFn(i)` function is used. This function takes an integer `i` as input and returns a calculated value (`i * 3 * 8`). The purpose of this function is to simulate some compute-intensive operation. **Special JS Feature/Syntax:** None of the test cases use any special JavaScript features or syntax that would impact their performance in a non-standard way. **Alternative Approaches:** Other alternatives for iterating over an array include: * `while` loop * `forEach` with a custom callback function (not as efficient as using `map`) * Using `reduce()` instead of `map` * Using a library like Lodash to simplify iteration over arrays Note that the choice of iteration approach depends on the specific use case and performance requirements.
Related benchmarks:
index loop vs for-of loop vs foreach vs map
Array loop vs foreach vs map (Small arrays)
Array loop: forEach vs for vs map vs for of entries
Array loop vs foreach vs map with large array
Array loop vs for of loop vs foreach vs map fixed
Comments
Confirm delete:
Do you really want to delete benchmark?