How to use sort() method with for…of loop In Javascript

Using a Set in JavaScript

In this approach,we utilize the sort() method to alphabetically sort the characters of our inputStr. Then, we employ a for…of loop to iterate through the sorted string, identifying and gathering duplicate characters while ensuring they are not duplicated within an array.

Syntax:

array.sort()

Example: In this example we are using the above-explained approach.

Javascript

const inputStr = "w3wiki";
const sortedStr = inputStr.split('').sort().join('');

let duplicates = [];
let prevChar = sortedStr[0];

for (const char of sortedStr.slice(1)) {
    if (char === prevChar
        && !duplicates.includes(char)) {
        duplicates.push(char);
    }
    prevChar = char;
}

if (duplicates.length > 0) {
    console.log(`The duplicate characters : ${duplicates.join(', ')}`);
} else {
    console.log(`The string "${inputStr}" has no duplicate characters.`);
};

Output

The duplicate characters : G, e, k, s

JavaScript Program to Check for Repeated Characters in a String

In this article, we are going to see various methods with which you can detect repeated characters in a string. Checking for repeated characters in a string involves examining the string’s content to identify if any character occurs more than once. This helps detect duplications or repetitions within the text.

Input: Str = “w3wiki”
Output:
e, count = 4
g, count = 2
k, count = 2
s, count = 2
Explanation: e,g,k,and s are characters which are occured in string in more than one times.

There are several methods that can be used to Check for repeated characters in a string JavaScript.

Table of Content

Using sort() method with for…of loop
Using a Set in JavaScript
Without using Extra Data Structure
Using a Map
Using Object as a Frequency Counter:

We will explore all the above methods along with their basic implementation with the help of examples.

How to use sort() method with for…of loop In Javascript

JavaScript Program to Check for Repeated Characters in a String

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