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for vs every 2
(version: 0)
Compare loop performance
Comparing performance of:
for vs every
Created:
2 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var array = new Array(100);
Tests:
for
function asd(arg) { return arg === 50; } function dsa() { for (var i = 0; i < array.length; i++) { if (asd(i)) { return; } } } dsa()
every
function asd(arg) { return arg !== 50; } function dsa() { return array.every((item, index) => asd(index)); } dsa()
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
for
every
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 compares the performance of two loop constructs: `for` and `every`. The goal is to determine which loop construct is faster in terms of execution speed. **Loop Constructs Being Compared** 1. **For Loop**: A traditional, explicit loop that uses a counter variable (`i`) to iterate through an array. 2. **Every Method**: A method on the Array prototype that returns true if all elements in the array pass the test implemented by the provided function. **Options Being Compared** The benchmark compares the performance of these two loop constructs: * For Loop: Using a traditional `for` loop with an explicit counter variable (`i`) and accessing array elements using indexing (`array[i]`). * Every Method: Using the `every` method on the Array prototype, which takes a callback function as an argument. The callback function is executed for each element in the array, and the `every` method returns true if all elements pass the test. **Pros and Cons** **For Loop:** Pros: * Easy to understand and implement. * Can be optimized using techniques like loop unrolling or caching. Cons: * Can be slow due to the overhead of the explicit counter variable and indexing operations. **Every Method:** Pros: * Convenient and concise, as it leverages a built-in method on the Array prototype. * Can be faster since it avoids the overhead of an explicit loop counter. Cons: * May have performance issues due to the way it handles array iteration (e.g., using a temporary array or object for the callback function). * Limited control over optimization opportunities, as it's a black-box method. **Library and Special JS Feature** The `every` method is a part of the JavaScript standard library, specifically on the Array prototype. It's implemented in V8 (the engine used by Chrome) and other JavaScript engines. There are no special JavaScript features or syntax being used in this benchmark beyond what's standard for JavaScript. **Other Alternatives** Alternative loop constructs that could be tested in a similar benchmark include: * `forEach` method: Similar to the `every` method, but executes the callback function for each element without returning early. * `reduce` method: Reduces the array to a single value by executing a provided callback function for each element. These alternatives would require modifications to the benchmark code and may introduce additional complexities or performance trade-offs.
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