how to check for duplicate syntax in javascript
let strArray = [ "q", "w", "w", "w", "e", "i", "u", "r"];
let findDuplicates = arr => arr.filter((item, index) => arr.indexOf(item) != index)
console.log(findDuplicates(strArray)) // All duplicates
console.log([...new Set(findDuplicates(strArray))]) // Unique duplicateshow 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"]Copyright © 2021 Codeinu
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