In this example findComments() function returns all comments located inside the indicated element (in our case document.body). The function can be slightly updated to find the odd. Var comments = findComments(document.body) // finds all comments inside body and nested elements The findEvenNumbers() function takes an array as a parameter and finds all even numbers in the array. Var iterator = document.createNodeIterator(element, NodeFilter.SHOW_COMMENT, filterNone, false)
Since I am a football fanatic, we will analyze some top football stars in the world of football.In this article, we would like to show you how to find all HTML comments using JavaScript. To simplify this definition, let’s visualize an array as a container that stores Different kinds of elements in an orderly manner.Īs earlier said, we will have lots of fun while learning. In JavaScript, arrays start at index zero and can be manipulated with various methods. This is compared to a variable that can store only one value.Įach item in an array has a number attached to it, called a numeric index, that allows you to access it. Arrays are used to store multiple values in a single variable. Ensure that all doubts and misunderstandings are cleared by leaving your questions and comments for this article in the comment section.Īccording to MDN: An array is an ordered collection of data (either primitive or object depending upon the language).If you are new to the iteration methods in JavaScript, I urge you to get your hands on your keyboard and type along as this will help retain the syntax associated with these methods to your memory.If you are conversant with these iteration methods already, this article will serve as a great reference piece to you in the future.Second thing, if you want to match 4,5, you have to look into the string instead of making a strict comparison. Array.filter returns a new array containing all matching elements, if it matches nothing. While this article will be more focused on making you understand these two array iteration methods, it will also create a fun, interesting and easy learning experience to its readers. Two things: first, Array.find () returns the first matching element, undefined if it finds nothing. Using these methods reduces the use of for, while, do-while loops and the likes which have more verbose syntax relative to the array iteration methods. Some of these iteration methods are immutable, which means they do not change the original array. With the ever-improving ecosystem of JavaScript, the ES6 version of JavaScript unwraps the array iteration methods that help its developers write clean and readable code.
JavaScript find() and filter() Array Iteration Methods Made Easy
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