how to find repeated characters in a string in javascript
/* 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"]find repeated words in paragrah a string javascript
const str = "big black bug bit a big black dog on his big black nose";
const findDuplicateWords = str => {
const strArr = str.split(" ");
const res = [];
for(let i = 0; i < strArr.length; i++){
if(strArr.indexOf(strArr[i]) !== strArr.lastIndexOf(strArr[i])){
if(!res.includes(strArr[i])){
res.push(strArr[i]);
};
};
};
return res.join(" ");
};
console.log(findDuplicateWords(str));Copyright © 2021 Codeinu
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