The findIndex() method executes a function for each array element. The findIndex() method returns the index (position) of the first element that passes a test. The findIndex() method returns -1 if no match is found.

Sep 8, 2011 · The findIndex() method returns the index of the first element in the array that satisfies the provided testing function. Otherwise -1 is returned. var fooArray = [5, 10, 15, 20, 25]; console.log(fooArray.findIndex(num=> { return num > 5; })); // expected output: 1 Find an index by object property. To find an index by object property:

Mar 13, 2025 · The findIndex() method of Array instances returns the index of the first element in an array that satisfies the provided testing function. If no elements satisfy the testing function, -1 is returned.

The indexOf() method returns the first index (position) of a specified value. The indexOf() method returns -1 if the value is not found. The indexOf() method starts at a specified index and searches from left to right (from the given start postion to the end of the array).

Jul 9, 2024 · Uses the findIndex method on an array to find the index of the first odd element. Returns -1 since there are no odd elements in the array. Here, the method findIndex () finds all the indices that contain positive numbers. Since 0.30 is a …

Nov 18, 2024 · Here are some effective methods to find the array index with a value in JavaScript. indexOf () returns the first index of a specified value in an array, or -1 if the value is not found. findIndex () is used for finding the index of an element based on complex conditions.

The indexOf() method searches an array for an element value and returns its position. Note: The first item has position 0, the second item has position 1, and so on. Example

In this tutorial, you will learn about the JavaScript Array findIndex () method with the help of examples. The findIndex () method returns the index of the first array element that satisfies the provided test function or else returns -1.

The findIndex() method allows you to find the index of the first element in an array that satisfies a provided function. Here’s the syntax of the findIndex() method: findIndex(callbackFn)

The Array.findIndex() method in JavaScript is used to find the index of the first element in an array that satisfies a provided testing function.