Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
Array with and without predefined size
(version: 0)
Comparing performance of:
Array predefined size vs Array no size vs array no size (push) vs Array predefined size (large) vs Array no size (large)
Created:
3 years ago
by:
Guest
Jump to the latest result
Tests:
Array predefined size
const arr = Array(10000); for (let i = 0; i < 10000; i++) { arr[i] = i * 2; }
Array no size
const arr = []; for (let i = 0; i < 10000; i++) { arr[i] = i * 2; }
array no size (push)
const arr = []; for (let i = 0; i < 10000; i++) { arr.push(i * 2); }
Array predefined size (large)
const arr = Array(1000000); for (let i = 0; i < 1000000; i++) { arr[i] = i * 2; }
Array no size (large)
const arr = []; for (let i = 0; i < 1000000; i++) { arr[i] = i * 2; }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (5)
Previous results
Fork
Test case name
Result
Array predefined size
Array no size
array no size (push)
Array predefined size (large)
Array no size (large)
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 provided benchmark JSON and explore what's being tested, compared options, pros and cons, library usage, special JavaScript features, and alternative approaches. **Benchmark Overview** The "Array with and without predefined size" benchmark consists of four individual test cases: 1. **Array predefined size**: Creates an array of 10,000 elements using `Array(10000)` and fills them with values. 2. **Array no size**: Creates an empty array and then pushes 10,000 elements into it using a `for` loop. 3. **array no size (push)**: Similar to the previous test, but uses `push()` method instead of manual indexing. 4. **Array predefined size (large)**: Creates an array of 1,000,000 elements and fills them with values. **Comparison** The benchmark tests two approaches for creating and filling arrays: * Manual indexing (`arr[i] = i * 2;`) * Pushing elements onto the end of the array using `push()` method Both methods have their own strengths and weaknesses: * **Manual indexing**: Pros: + Can be more efficient for small to medium-sized arrays. + Allows for more control over memory allocation. + Often preferred in older JavaScript versions (pre-ES6). * **Pushing elements onto the end of the array**: Pros: + More flexible and dynamic, as it doesn't require manual indexing. + Can be faster for larger arrays due to the optimized `push()` method. + Widely used and supported in modern JavaScript versions (post-ES6). **Cons** * Manual indexing can lead to slower performance on modern browsers due to the overhead of array resizing. * Pushing elements onto the end of the array can lead to slower performance for smaller arrays, as it requires more memory allocations. **Library Usage** The benchmark uses `Array(10000)` and `push()` method, which are built-in JavaScript features. No external libraries or frameworks are required. **Special JavaScript Features** None mentioned in this explanation. **Alternative Approaches** Other ways to create and fill arrays include: * Using `Array.prototype.fill()` method (ES6+): Fills an array with a single value. * Using `Array.from()` method (ES6+): Creates a new array from an iterable source, such as an array or string. * Using `Array.prototype.map()` method (ES6+): Applies a transformation function to each element in the original array. These alternatives might be worth exploring for different use cases, but are not directly relevant to this specific benchmark.
Related benchmarks:
Array creation types
Creating arrays with specified length
JS array emptiness check
array.length vs array.length > 0 without console.log
checking empty array
Comments
Confirm delete:
Do you really want to delete benchmark?