In this question, the candidate needs to implement a function
customFindLastIndex that mimics the behaviour of
findLastIndex() method iterates the array in reverse order and returns the index of the first element that satisfies the provided testing function. If no elements satisfy the testing function,
-1 is returned.
const array = [1,2,3,12,13,8]; const greaterThanTen = (element) => element > 10; console.print(array.findLastIndex(greaterThanTen)); // expected output: 4
customFindLastIndex takes two parameters
Function to execute on each value in the array. The function is called with the following arguments:
- The current element in the array.
- The index (position) of the current element in the array.
- The array that
customFindwas called on.
The callback must return a truthy value to indicate a matching element has been found.
Object to use as
this inside callbackFn.
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