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 duplicatescounting duplicate values javascript
var counts = {};
your_array.forEach(function(x) { counts[x] = (counts[x] || 0)+1; });Copyright © 2021 Codeinu
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