Searching Arrays with indexOf and lastIndexOf

In JavaScript, the indexOf() method returns the first index at which a specified element can be found in an array. If it does not exist in the array, -1 is returned instead. Similarly, lastIndexOf() returns the last index where an element appears or -1 if it doesn't exist within the array. These methods are incredibly useful when searching for elements and are commonly used in various coding instances.

Array.prototype.lastIndexOf()

The lastIndexOf() method returns the last index at which a given element can be found in the array, or -1 if it is not present. The array is searched backwards, starting at fromIndex.

Source: Mozilla, https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/lastIndexOf
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