findLastIndex
Returns the index of the last element in the array where predicate is true, and -1 otherwise.
Parameters
predicate
findLastIndex calls predicate once for each element of the array, in descending order, until it finds one where predicate returns true. If such an element is found, findLastIndex immediately returns that element index. Otherwise, findLastIndex returns -1.
thisArg
If provided, it will be used as the this value for each invocation of predicate. If it is not provided, undefined is used instead.