Question

How to remove non-duplicate characters from string in JavaScript

Answer 1

const removeNonDuplicate = str => {
   const arr = str.split("");
   
   const duplicateArray = arr.filter(ch => {
        return arr.indexOf(ch) !== arr.lastIndexOf(ch);
   });
   
   return duplicateArray.join("");
}

const str = "Bubble Occurrence Mammal xya";

console.log(removeNonDuplicate(str));



/*
run:

ubble ccurrece ammal a

*/

 

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