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Array.last_index_of

last_index_ofconditionstart

Group: Values

Documentation​

Returns the last index of an element in the array. Returns Nothing if the element is not found.

Arguments​

  • condition: Either the element to search for, a Filter_Condition or a predicate function to test each element.
  • start: The index to start searching backwards from. If the index is negative, it is counted from the end of the array.

Examples​

Find the last index of an element in an array.​

      [1, 2, 3, 1, 2, 3].to_array.last_index_of 2 == 4

Find the index of the last palindrome.​

      ["ab", "abab", "aba", "bbb"].to_array.last_index_of (s-> s == s.reverse) == 3