lastIndexOf() method returns the last index at which a given element can be found in the array, or -1 if it is not present.
Note: The array is searched backwards, starting at start index.
|value||Required||Specifies the value to be searched in an array.|
|start||Optional||Specifies the starting position.|
If start is omitted, the default value is -1.
|Number||The last index at which a given element can be found in the array.|
|-1||If the specified element not found within an array.|
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