score:115

Accepted answer

You can use moment.max function :

let moments = this.state.dates.map(d => moment(d)),
    maxDate = moment.max(moments)

score:-4

Sort them with a custom compartor, then select the first one (or last, try it out);

   array.sort(function(d1, d2) {
       return moment(d1).isBefore(moment(d2));
        });

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