Retrieving Array Coordinates of Duplicated Elements

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Google Apps Script / javascript

This sample is for retrieving array coordinates of duplicated elements.

Script :

var inputdata = ["a", "b", "b", "c", "d", "c", "e", "a", "f", "g"];

var dic = {};
var result = [];
inputdata.forEach(function(e, i){
  if (dic[e]) {
    result[i] = 'Duplicated';
  } else {
    result[i] = null;
  }
  dic[e] = "temp";
});

Logger.log(JSON.stringify(result))
Logger.log([i for (i in result) if(result[i]=='Duplicated')])

Result :

[null,null,"Duplicated",null,null,"Duplicated",null,"Duplicated",null,null]
[2, 5, 7]

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