CODEWITHSUNDEEP
javascript
Jose J
Jose J

Reputation: 31

How to delete characters that appear more than once in a string

for(var i=0; i <array.length;i++){
    for(var j=1; j<=array.length;j++) 
    if(array[i]==array[j])  array.splice(j,1)
}

Have been trying using the code above but it just deletes every other char.

Upvotes: 3

Views: 759

Answers (3)

Dani Vijay
Dani Vijay

Reputation: 2258

Straightforward method with join and Spread syntax (...) by utilising uniqueness property of Set

let a = 'aaabbbcdddd';
console.log([...new Set(a)].join(''));

The Set object lets you store unique values of any type

We are giving string(which is iterable) to initiate the Set, which will remove all duplicates from it. Then we are converting it back to an array with Spread syntax (...). Finally, join the array back together to make it a string.

Upvotes: 2

A Rogue Otaku
A Rogue Otaku

Reputation: 923

My way would be to convert it into a Set and then to an Array and then join to get the final Stirng back.

let a = 'aaabbbcdddd';
console.log(Array.from(new Set(a)).join(''));

Upvotes: 4

junvar
junvar

Reputation: 11574

Your iterators i and j will incorrectly overlap. You should instead start your j iteration at i+1.

let str = 'the hippos are singing';
let array = [...str];
for (var i = 0; i < array.length; i++) {
  for (var j = i + 1; j <= array.length; j++)
    if (array[i] === array[j])
      array.splice(j, 1)
}
console.log(array.join(''));

Upvotes: 0

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