new-set
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let str="eefhhfjhfFfhwfhwr"
let arr=str.toLowerCase().split('')
// console.log(arr)
let filtered=arr.filter((e, i, a) => a.indexOf(e)!==i)
console.log('Filtered ',filtered)
let filtered1=arr.filter((e, i, a) => a.indexOf(e)===i)
console.log('All Letters Without Repeat, Using Filter: ', filtered1)
let res=[...new Set(arr)]
console.log('All Letters Without Repeat, Using new Set: ',res)
let result=[...new Set(filtered)]
console.log('Only Letters That Have Repeated: ', result)
JavaScript
INFO