Another solution without additional data structures but using objects, with performance O(N).
function isUnique3(str){
let obj = {}
for( let elem of str){
if(obj.hasOwnProperty(elem)) obj[elem]++
else obj[elem]=1
}
for( key in obj){
if (obj[key]=== 1) return true
else return false
}
}
lhchavez
commented
3 years ago
Another solution without additional data structures but using objects, with performance O(N).
function isUnique3(str){ let obj = {} for( let elem of str){ if(obj.hasOwnProperty(elem)) obj[elem]++ else obj[elem]=1 } for( key in obj){ if (obj[key]=== 1) return true else return false } }
isUnique3('ada') // false isUnique3("golden") // true