If no element is present with the given constraint or condition then, it returns -1.

This method will return the index of the first element in the given array even if there are two or more numbers. The ‘findIndex()’ method in JavaScript arrays will return the first element from the given array with the given constraint being satisfied. In this tutorial a functionality of array object ‘findIndex()’ is explained and demonstrated with some examples. In JavaScript, Arrays are objects and these objects have some inbuilt functions and properties by which one can do the operations faster and easier. For example, if array is declared as integer data type then it stores one or more elements of the integer data type.

In the next tutorial, we will discuss Array some() method with the help of examples.Array is a data type which can store multiple elements of similar data types. Hope that you will have understood how to find the index of the first matching element in an array based on specific test condition using findIndex() method. In this tutorial, you have learned array findIndex() method in JavaScript with the help of example programs. The general syntax of the findIndex() method in JavaScript is: // Arrow functionĪrr.findIndex((element) => ) => name = 'Belly') Let index = numbers.findIndex(isGreater) Ĭonsole.log('Index of first greater number than 2: ' +index) Find the index of first greater number than 2. Callback function to check greater number than 2.

Otherwise, it returns -1 if no matching is found.įor example, the following snippet code returns the index of the first number that’s greater than 2. In other words, find() method of array returns the index of first array element that satisfies provided testing function (i.e.

Array findindex javascript