Unable to convert foreach written angular js to angular 5 .

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Angular5

Hello, I am new to angular 5 rather to angular.I have a piece of code for 'file upload' written in angular 1 and I am unable to convert it to angular 5. I am stuck !Need help..

What I have tried:

var files = $scope.files;

var fd = new window.FormData();

       angular.forEach(files, function (value, key) {
           fd.append(key, value);
       });

Please convert above code in angular 5, having issues with angular foreach!!