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how to find repeated characters in a string in javascript

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Odd Opossum answered on April 16, 2021 Popularity 10/10 Helpfulness 4/10

answer how to find repeated characters in a string in javascript

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how to find repeated characters in a string in javascript

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/* Time complexity of solution: O(n) */
const getRepeatedChars = (str) => {
 	const chars = {};
    for (const char of str) {
        chars[char] = (chars[char] || 0) + 1;
    }
    return Object.entries(chars).filter(char => char[1] > 1).map(char => char[0]);
}

getRepeatedChars("aabbkdndiccoekdczufnrz"); // ["a", "b", "c", "d", "k", "n", "z"]

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: Grepper

Tags: find javascript string

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Contributed on Apr 16 2021

Odd Opossum

0 Answers Avg Quality 2/10

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JavaScript find repeated character

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Input:
S = "geeksforgeeks"
Output: g
Explanation: g, e, k and s are the repeating
characters. Out of these, g occurs first.


const repeatedCharacter = (str) => {
  for (let i = 0; i < str.length - 1; i++) {
    for (let j = i + 1; j < str.length; j++) {
      if (str[i] === str[j]) {
        return str[i];
      }
    }
  }
  return -1
};
console.log(repeatedCharacter("geeksforgeeks"));

Popularity 10/10 Helpfulness 5/10 Language javascript

Source: practice.geeksforgeeks.org

Tags: character char

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Contributed on Jul 30 2022

Syed Hanifullah

0 Answers Avg Quality 2/10

javascript check repeated char

Comment

function hasRepeats (str) {
    return /(.).*\1/.test(str);
}

Popularity 8/10 Helpfulness 5/10 Language javascript

Source: stackoverflow.com

Tags: char javascript javas

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Contributed on Oct 01 2022

thabo

0 Answers Avg Quality 2/10

find duplicate characters from string in javascript

Comment

const getRepeatedChars = (str) => {
    let result = [];
    str.map(each => {
      let repeatedChars = 0;
      for (let i = 0; i < each.length - 1; i++) {
          if (each[i] === each[i + 1] && each[i] !== each[i - 1]) {
            repeatedChars += 1;
          }
      }
      
        result.push(repeatedChars);
    });

    return result;
};

getRepeatedChars(["aaabbbkdnndicccoekdczufnrz", "awsfgds"]); // [4, 0]

Popularity 1/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: find javascript string

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Contributed on Jul 30 2021

Adorable Antelope

0 Answers Avg Quality 2/10

how to find repeated characters in a string in javascript

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