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for vs for (reverse with length) vs every vs forEach with small array
(version: 0)
Comparing performance of:
for vs for (reverse with length) vs some vs every vs forEach
Created:
4 years ago
by:
Guest
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Script Preparation code:
var array = new Array(100);
Tests:
for
for (var i = 0; i < array.length; i++) { array[i]; }
for (reverse with length)
var length = array.length; for (var i = length; --i >= 0;) { array[i]; }
some
array.some(function(i) { array[i]; });
every
array.every(function(i) { array[i]; });
forEach
array.forEach(function(i) { array[i]; });
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (5)
Previous results
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Test case name
Result
for
for (reverse with length)
some
every
forEach
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! **What is being tested?** MeasureThat.net is testing four different approaches to iterate over an array in JavaScript: 1. `for` loop 2. `for` loop with reverse iteration and length calculation (`for (reverse with length)`) 3. `some()` method 4. `every()` method 5. `forEach()` method The test case uses a small array of 100 elements. **Options compared** Here's what's being compared: * Looping over an array: `for`, `for` with reverse iteration and length calculation (`for (reverse with length)`), `some()`, `every()`, and `forEach()` * Performance differences between these approaches **Pros and Cons of each approach** 1. **For loop**: Simple, efficient, and widely supported. * Pros: Easy to understand, fast execution * Cons: Can be slower for large arrays due to overhead of incrementing the counter variable 2. **For loop with reverse iteration and length calculation (`for (reverse with length)`)**: * Pros: Reduces memory allocation and copying of elements during iteration * Cons: More complex code, less intuitive 3. **Some() method**: Iterates over the array as soon as a condition is false. * Pros: Can terminate early if no match is found * Cons: May be slower than traditional `for` loop for large arrays 4. **Every() method**: Iterates over the entire array before returning `false`. * Pros: Simple and intuitive * Cons: Slower than traditional `for` loop, can return early if no match is found 5. **ForEach() method**: Iterates over the array and executes a callback function for each element. * Pros: Easy to understand, fast execution * Cons: May be slower than traditional `for` loop due to overhead of executing the callback **Library used** In this test case, no specific library is being used. The JavaScript core functions (`Array.prototype.forEach`, `Array.prototype.some`, and `Array.prototype.every`) are being tested. **Special JS feature or syntax** None mentioned in the provided benchmark definition.
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