JSFiddle - React, Tailwind, and code Playground

HTML

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JavaScript

(function(){
    function Check(){
        var arr = Array.prototype.slice.call(arguments);
        var result = [];
        for(i=0; i< arr.length; i++){
            var duplicate = 0;
            var val = arr[i];
            arr.map(function(x){
                if(val == x) duplicate++;
            })
            result.push(duplicate>= 2);
        }
        return result;
    }
    
 var test = new Check(1,2,1,4,1);
 console.log(test);
})();