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Module: List
Function: elemIndex
Type: Eq => a -> [a] -> Maybe Int
Description: returns the index of the first occurrence, if any, of value in list.
Related: elemIndices, find, findIndex, findIndices

Example 1

Input: elemIndex 2 [1,2,3,4,5]

Output: Just 1

Example 2

Input: elemIndex 2 [2,2,2,3,3,3,4,4,4]

Output: Just 0

Example 3

Input: elemIndex 10 [1,2,3,4,5]

Output: Nothing

Example 4

Input: elemIndex 'f' "abcdefghi"

Output: Just 5




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