Syntax: (selector). This method can add elements to the whole document, or just inside the context element if the context parameter is defined. This method could be implemented as follows.Ī = function (predicate, thisValue) Īs you can see in Kangax’ ECMAScript 6 compatibility table, recent versions of Firefox and Chrome already support the *() methods.įurthermore, Paul Millr’s es6-shim has backported the methods to ECMAScript 5. You can use the findIndex () method on Arrays in Javascript to search through an array and find the index of an element which meets/satisfies a testing condition that you pass in through a. The jQuery add () method is used to add elements to the existing group of elements. If the callback never returns true, find() returns undefined (2). If predicate returns true, find() stops iterating and returns the current element (1). When iterating from the beginning of an array, the loop must check each element of the array until it finds the desired element.

The signature of the callback predicate() isįind() iterates over the array (while skipping holes) and calls predicate for each element. findLastIndex () These two new methods for arrays allow you to search for an element in an array from the end of the array, rather than from the beginning. Two new Array methods (proposed by Rick Waldron) are in the latest ECMAScript 6 specification draft:Ī(predicate, thisValue?) Newer version of this post: “ ECMAScript 6’s new array methods” The findIndex() method returns the index of the first array element that satisfies the provided test function or else returns -1. Let's take a look at an example of how to use the findIndex() method in JavaScript.Update. In this tutorial find and findIndex methods of javascript arrays are explained in an eaay way that suits best for beginners and professional developers as well.

Array findindex javascript