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let appData = {
  firstName: 'Lucy',
  lastName: 'Green',
  age: 12222,
  ss: 22
}
undefined
let exp = "firstName + ' ' + lastName"
undefined
new Function (...Object.keys(appData), `return ${exp}`) (...Object.values(appData))

"Lucy Green"

let appData = {
  firstName: 'Lucy',
  lastName: 'Green',
  age: 12222,
  ss: 22
}


let exp = "firstName + ' ' + lastName"
undefined
var fff=new Function (...Object.keys(appData), `return ${exp}`)
undefined
fff
function anonymous(firstName,lastName,age,ss
/**/) {
return firstName + ' ' + lastName
}

fff(...Object.values(appData))
"Lucy Green"

http://www.w3school.com.cn/js/pro_js_functions_function_object.asp