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Array elements adding with allocation
(version: 0)
Comparing performance of:
by index vs by push
Created:
3 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var str = ""; var i;
Tests:
by index
var sArr = new Array(1000); for (i = 1000; i > 0; i--) { sArr[i] = i; }
by push
var sArr = []; for (i = 1000; i > 0; i--) { sArr.push(i); }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
by index
by push
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 world of JavaScript microbenchmarks on MeasureThat.net. **Benchmark Overview** The benchmark measures the performance of two approaches to add elements to an array: using the `new Array` constructor with allocation, and using the `push` method. The test cases are designed to exercise these different allocation strategies, which can impact performance in various scenarios. **Options Compared** Two options are compared: 1. **Using `new Array`**: This approach creates a new array and allocates memory for its elements. The array is initialized with a fixed size (1000) before the loop starts. 2. **Using `push`**: This approach adds elements to an empty array using the `push` method. Each iteration of the loop appends a new element to the end of the array. **Pros and Cons** * **Using `new Array`:** + Pros: - Can be faster for large arrays since it allocates memory upfront. - May lead to better cache locality due to contiguous allocation. + Cons: - Requires more memory initially, which can impact performance in memory-constrained scenarios. - May not scale well with growing array sizes. * **Using `push`:** + Pros: - Uses less memory upfront since only a single element is allocated initially. - Can be more scalable with growing array sizes since elements are added dynamically. + Cons: - May lead to slower performance due to dynamic allocation and garbage collection. **Library Used** None. This benchmark does not use any external libraries or frameworks. **Special JS Features or Syntax** The benchmark uses JavaScript syntax features such as `for` loops, variable declarations (`var i;`), and array creation (`var sArr = new Array(1000);` or `var sArr = []`). These are standard JavaScript constructs, and users with deep knowledge of JavaScript will be familiar with them. **Other Considerations** When interpreting the benchmark results, keep in mind that: * The `ExecutionsPerSecond` metric represents the average number of executions performed per second. * The results are specific to Firefox 102 on Windows Desktop. * Other browsers, operating systems, and devices may produce different results due to varying hardware and software configurations. **Alternatives** If you're interested in exploring similar benchmarks or want to experiment with other allocation strategies, MeasureThat.net offers a wide range of benchmarks that cover various aspects of JavaScript performance. Some examples include: * Benchmarks for memory allocation patterns (e.g., using `Array.prototype.fill()` vs. `Array.prototype.set()`) * Benchmarks for array operations (e.g., sorting, filtering, and reducing) * Benchmarks for web performance-related topics (e.g., event handling, rendering, and caching) Feel free to explore these alternatives and find the benchmarks that best suit your interests and expertise level!
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