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for vs foreach vs some vs for..of vs jQuery.each()
(version: 0)
Compare loop performance
Comparing performance of:
for vs foreach vs some vs for..of vs jQuery.each()
Created:
7 years ago
by:
Guest
Jump to the latest result
HTML Preparation code:
<script src="https://code.jquery.com/jquery-1.10.2.js"></script>
Script Preparation code:
var array = new Array(100);
Tests:
for
for (var i = 0; i < array.length; i++) { array[i]; }
foreach
array.forEach(function(i) { array[i]; });
some
array.some(function(i) { array[i]; });
for..of
for (var i of array) { array[i]; }
jQuery.each()
jQuery.each(array, function(index, id) { return index; });
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (5)
Previous results
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Test case name
Result
for
foreach
some
for..of
jQuery.each()
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 break down the provided benchmark and explain what each test case is testing, along with their pros and cons. **Benchmark Overview** The benchmark compares the performance of four different loop constructs in JavaScript: 1. Traditional `for` loop 2. `forEach` method 3. `some` method 4. `for...of` loop **Test Case 1: Traditional `for` Loop** * **Script Preparation Code**: Creates an array of 100 elements. * **Benchmark Definition**: `for (var i = 0; i < array.length; i++) {\r\n array[i];\r\n}` * **Purpose**: Tests the performance of a traditional `for` loop, which is a basic and widely used construct. Pros: * Simple to understand and implement. * Well-supported by most browsers. Cons: * Can be slow for large arrays due to the overhead of incrementing the loop variable. **Test Case 2: `forEach` Method** * **Script Preparation Code**: Creates an array of 100 elements. * **Benchmark Definition**: `array.forEach(function(i) {\r\n array[i];\r\n});` * **Purpose**: Tests the performance of the `forEach` method, which is a modern and efficient way to iterate over arrays. Pros: * Fast and efficient for large arrays. * Supports callback functions. Cons: * Not supported in older browsers or with limited JavaScript engines. **Test Case 3: `some` Method** * **Script Preparation Code**: Creates an array of 100 elements. * **Benchmark Definition**: `array.some(function(i) {\r\n array[i];\r\n});` * **Purpose**: Tests the performance of the `some` method, which returns a boolean value indicating whether at least one element in the array meets the specified condition. Pros: * Fast and efficient for large arrays. * Returns a boolean value instead of iterating over the entire array. Cons: * Not designed for iteration; it's primarily used for conditional checks. **Test Case 4: `for...of` Loop** * **Script Preparation Code**: Creates an array of 100 elements. * **Benchmark Definition**: `for (var i of array) {\r\n array[i];\r\n}` * **Purpose**: Tests the performance of the `for...of` loop, which is a modern and concise way to iterate over arrays. Pros: * Fast and efficient for large arrays. * Concise syntax. Cons: * Not supported in older browsers or with limited JavaScript engines. **Test Case 5: `jQuery.each()` Method** * **Script Preparation Code**: Includes the jQuery library. * **Benchmark Definition**: `jQuery.each(array, function(index, id) {\r\n return index;\r\n});` * **Purpose**: Tests the performance of the `jQuery.each()` method, which is a utility function for iterating over arrays. Pros: * Fast and efficient for large arrays. * Supports callback functions. Cons: * Requires jQuery library inclusion. * Not supported in older browsers or with limited JavaScript engines. **Other Alternatives** Besides these five test cases, other loop constructs like `while` loops or recursive functions are not included in the benchmark. However, it's worth noting that these alternatives may have different performance characteristics and use cases. In general, when choosing a loop construct for your JavaScript code, consider factors such as: * Performance: How fast does the loop need to execute? * Code readability: How concise and readable is the loop syntax? * Browser support: What browsers do you need to support? * Library inclusion: Are any external libraries required?
Related benchmarks:
for vs foreach vs some
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foreach vs for..of
foreach vs for...of
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