how to append 2 usestates in react js

i have 2 useStates i want to append both when i call SubmitData
allValues has many datas name ,age ,sex etc.. i want add domestic also into allvalues so i am trying to use form data but i am getting a empty formData

const SubmitData = () => {
    const formData = new FormData();
    if (domestic != null) {
      formData.append("domestic", domestic);
    }
    if (allValues != null) {
      Object.entries(allValues).forEach(([key, value]) =>
        formData.append(key, value)
      );
    }

    const config = {
      headers: {
        Authorization: `token ` + localStorage.getItem("sales"),
      
      },
    };

    console.log(formData);
    
  };

>Solution :

You can simply do this way

if(domestic !== null) {
   allValues.domestic = domestic
}

It will automatically populate your domestic data to allValues.

If you want to have formData as a main variable

const formData = {
   ...allValues,
}
if(domestic !== null) {
   formData.domestic = domestic
}

ES5 version

const formData = Object.assign({}, allValues);
if(domestic !== null) {
   formData.domestic = domestic
}