different operations of set

functionsInSet.js

    var new_js = new Set(["Maps", "functions" , "filters" , "generators" , "loops"])
    var old_js = new Set(["functions" , "var" , "loops" , "this"])

    union(new_js, old_js)
    intersection(new_js, old_js)
    difference(new_js, old_js)

    function union(new_js, old_js) {
      var js = new Set(old_js)
      for(var item of new_js) {
        js.add(item)
      }
      console.log(js)
    }

    function intersection(new_js, old_js) {
      var js = new Set()
      for(var item of new_js) {
        if(old_js.has(item)) {
          js.add(item)
        }
      }
      console.log(js)
    }

    function difference(new_js, old_js) {
      var js = new Set(new_js)
      for(var item of old_js) {
        js.delete(item)
      }
      console.log(js)
    }