객체불러오기(펼침연산자사용>복사,추가,결합)

{
//객체불러오기(펼침연산자,복사)
      const ob18 = {
        a: 100,
        b: 200,
        c: "javascript"
      }
      const spread = {
        ...ob18
      };
      document.write(spread.a, "<br>");
      document.write(spread.b, "<br>");
      document.write(spread.c, "<br>");
      document.write( "<br><br>");  
    }

{
  //객체불러오기(펼침연산자,추가)
        const ob19 = {
        a: 100,
        b: 200,
        c: "javascript"
      };
      const spread = {
        ...ob19,
        d: "react"
      };
      document.write(spread.a, "<br>");
      document.write(spread.b, "<br>");
      document.write(spread.c, "<br>");
      document.write(spread.d, "<br>");  
      document.write( "<br><br>");  
}

{
  //객체불러오기(펼침연산자,결합)
        const ob20 = {
        a: 100,
        b: 200
      }
      const ob21 = {
        c: "javascript",
        d: "react"
      }
      const spread = {
        ...ob20,
        ...ob21
      }
      document.write(spread.a, "<br>");
      document.write(spread.b, "<br>");
      document.write(spread.c, "<br>");
      document.write(spread.d, "<br>");  
      document.write( "<br><br>");  
}