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Array fill map, vs for i loop
(version: 0)
People tend to use array fil and then foreach, we know foreach is faster than a for loop, but is it also faster if you use array fill first?
Comparing performance of:
for vs fill and map
Created:
2 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var iterations = 10000;
Tests:
for
for (i = 0; i < iterations; i++) { console.log(i); }
fill and map
Array(iterations).fill('').map((value, index) => console.log(index));
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
for
fill and map
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (X11; Linux x86_64; rv:133.0) Gecko/20100101 Firefox/133.0
Browser/OS:
Firefox 133 on Linux
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=571564" width="100%" height="500px"></iframe>
for
18/s
fill and map
18/s
View exact numbers
Test name
Executions per second
✓
for
18 Ops/sec
fill and map
18 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the provided benchmark definition and test cases to explain what's being tested, compared, and their pros and cons. **Benchmark Definition** The website MeasureThat.net allows users to create and run JavaScript microbenchmarks. The provided benchmark definition represents a comparison between two approaches: 1. **For loop**: A traditional for loop that iterates over an array using a counter variable `i`. 2. **Array fill and map**: Using the `fill` method to initialize an array with a specified length, followed by applying the `map` method to iterate over the array. **Options Compared** In this benchmark, we're comparing two approaches: * For loop (`"for"` ) * Array fill and map (`"fill and map"` ) These two approaches differ in how they handle iteration and element manipulation. The for loop is a traditional, low-level approach that requires manual management of the counter variable `i`. In contrast, array fill and map provide a higher-level abstraction by using built-in methods to initialize and iterate over an array. **Pros and Cons** Here's a brief summary of the pros and cons of each approach: * For loop: + Pros: Lightweight, no additional memory allocation required. + Cons: Error-prone, requires manual management of the counter variable `i`. * Array fill and map: + Pros: Concise, eliminates the need for manual counter management. Provides a higher-level abstraction. + Cons: May incur overhead due to method calls and memory allocation. **Library/Feature Used** In this benchmark, we're using: * `Array` (built-in JavaScript array object) * `fill` and `map` methods (part of the ECMAScript standard) These methods provide a convenient way to initialize and iterate over arrays without requiring manual management of counters or indices. The `fill` method initializes an array with a specified length, while the `map` method applies a transformation function to each element in the array. **Special JS Feature/Syntax** No special JavaScript features or syntax are used in this benchmark. It's designed to be platform-agnostic and testable using standard JavaScript implementations. **Alternative Approaches** Other alternatives for iterating over arrays include: * `forEach`: A method that calls a callback function on each element of an array, without the need for manual counter management. * Loops with increment/decrement operators (`++` and `--`) to iterate over arrays. * Using `Array.prototype.reduce()` or `Array.prototype.findIndex()` methods. These alternatives may offer different performance characteristics or trade-offs in terms of readability and maintainability. However, they are not explicitly compared in this benchmark definition.
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Array fill foreach, vs for i loop
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