Question

How to find the minimum index of a repeating element in an array with JavaScript

Answer 1

function findMininimumIndex(arr) {
    let minIndex = -1;
 
    let set = new Set();
 
    for (let i = arr.length - 1; i >= 0; i--) {
        if (set.has(arr[i]))
            minIndex = i;
        else 
            set.add(arr[i]);
    }
 
    return minIndex;
}

const arr = [ 3, 7, 8, 6, 9, 1, 8, 8, 6, 1, 1, 8 ];

console.log(findMininimumIndex(arr));


  
  
  
  
/*
run:
  
2
  
*/

 

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