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let names = ['Tayfun', 'Mehmet', 'Ahmet', 'Gökhan', 'Tayfun']
let countedNames = names.reduce(function (allNames, name) {
if (name in allNames) {
allNames[name]++
} else {
allNames[name] = 1
}
return allNames
}, {})
console.log(countedNames)
// { Tayfun: 2, Mehmet: 1, Ahmet: 1, 'Gökhan': 1 }