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The indexOf() method in JavaScript is used to search an array for a specified element, and returns the index of the first occurrence of the element in the array. If the element is not found in the array, the indexOf() method returns -1.

Here is an example of how the indexOf() method works:

const array1 = [1, 2, 3, 4, 5];

const result = array1.indexOf(3);

// the result will be: 2

In the code example above, we first declare an array called array1 that contains the numbers 1 through 5. We then use the indexOf() method to search the array1 array for the number 3. The indexOf() method takes a single argument, which is the element to search for in the array. In this case, we search for the number 3.

As a result of calling the indexOf() method, the result variable will be set to 2, which is the index of the first occurrence of the number 3 in the array1 array. If the element we were searching for was not found in the array, the result variable would be set to -1.