![]() ![]() If the item is a primitive value, like a string or number, you can use the indexOf method of an array: const letters = const index = letters. The findIndex() method of JavaScript returns the index of the element that satisfies a testing function or -1 if no element passed the test. Suppose you have the value of an item which is contained in an array, and you want to get its index. 1) Using the Array findIndex () method with a simple array example. ![]() The findIndex() method returns the index of the first array element that satisfies the provided test function or else returns -1. I'm also naming them property and value, since that's the usual name for such things (or key and value).Here is how to retrieve the index of an item in a JS array based on its value In this tutorial, you will learn about the JavaScript Array findIndex() method with the help of examples. ![]() Syntax: findIndex (array, predicate. It is different from indexOf because it takes the predicate function that iterates through each element of the array. If you want to make it clear that all the parts are required, then just use regular arguments: function findIndexInData(data, property, value) The Loadsh.findIndex () method is used to find the index of the first occurrence of the element. Why are you using an object to pass the arguments? You need all three components ( data, where, and what), whereas a object usually means each part is optional. Syntax: array.find (function (currentValue, index, arr),thisValue) Example 1: This example uses the find () method to search the element. It finds the element in the DOM tree by traversing through the root to the leaf. But I'd like to comment on your current code: JavaScript find () method: The find () method is used to find all the descendant elements of the selected element. Eric Blade is correct that this is a perfect use-case for findIndex. The JavaScript array findIndex() method is used to return the index value of the first element in the given array that satisfies the specified condition. ![]()
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