Vanilla JavaScript loops vs. jQuery.each: A Performance Comparison
This article explores the performance differences between using vanilla JavaScript for loops and jQuery's $.each method for array iteration. We'll demonstrate that, for speed, vanilla for loops, especially those with variable caching, significantly outperform $.each. This can result in speed improvements of up to 84%, as shown in jsperf benchmarks (link omitted for brevity, but easily searchable).
jQuery.each Example:
$.each(myArray, function() {
let currentElement = this;
// ... your code using currentElement ...
});
For Loop with Variable Caching (Fastest):
const len = myArray.length;
for (let i = 0; i < len; i++) {
let currentElement = myArray[i];
// ... your code using currentElement ...
}
For Loop without Variable Caching:
for (let i = 0; i < myArray.length; i++) {
let currentElement = myArray[i];
// ... your code using currentElement ...
}
Pre-calculated Length Attempt: (Similar performance to the cached version)
let len = myArray.length;
let i = 0;
for (; i < len; i++) {
let currentElement = myArray[i];
// ... your code using currentElement ...
}
Frequently Asked Questions (FAQs):
While this article focuses on performance, here's a summary of key differences and considerations for choosing between $.each and for loops:
-
Functionality: jQuery's
$.eachiterates over arrays and objects, offering a concise syntax.forloops provide more direct control over iteration. -
Performance:
forloops (especially with variable caching) are generally faster due to reduced function call overhead. The difference becomes more pronounced with larger datasets. -
Readability:
$.eachcan improve code readability for simple iterations.forloops are more explicit. -
Breaking the Loop: Returning
falsefrom the$.eachcallback breaks the loop.forloops usebreak. -
Index Access: Both provide access to the current index (though differently).
-
NodeList/HTMLCollection:
$.eachworks with NodeLists and HTMLCollections, butthisrefers to a DOM element, not a jQuery object. Wrap with$(this)to use jQuery methods. -
Native
forEach: JavaScript's nativeforEachoffers similar syntax to$.eachbut with potentially better performance than jQuery's implementation. -
Object Iteration: Both can iterate over objects.
-
Sparse Arrays:
$.eachskips undefined indices in sparse arrays, whileforloops include them. -
Chaining:
$.eachdoesn't support chaining like other jQuery methods.
In summary, for optimal performance, especially when dealing with large datasets, prioritize vanilla JavaScript for loops with variable caching. jQuery's $.each is more convenient for smaller datasets or when readability is paramount. Consider JavaScript's native forEach as a faster alternative to jQuery's $.each.
The above is the detailed content of Speed Question jQuery.each vs. for loop. For more information, please follow other related articles on the PHP Chinese website!
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