Question

How to remove all duplicate characters from a string in Node.js

Answer 1

function remove_duplicate_characters(s) {
  return s
    .split('')
    .filter(function(item, pos, self) {
        return self.indexOf(item) === pos;
    })
    .join('');
}

   
let s = "noooooodddeeeee.jssss prooooogramminggggg";
  
s = remove_duplicate_characters(s);
  
console.log(s); 
  
  
  
  
/*
run:
      
node.js prgami
   
*/

 

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Answer 2

function remove_duplicate_characters(s) {
    let arr = [];
    let result = '';
  
    for (let i = 0; i < s.length; i++) {
        if (!(s[i] in arr)) {
            result += s[i];
            arr[s[i]] = true;
        }
    }
     
    return result;
}

   
let s = "noooooodddeeeee.jssss prooooogramminggggg";
  
s = remove_duplicate_characters(s);
  
console.log(s); 
  
  
  
  
/*
run:
      
node.js prgami
   
*/

 

70+ SQL courses for beginners and professionals