text: function DataType() {
      var length = 7
      var lastName = "Gogosing"
      var x = {firstName: "Rust", lastName: "Golang"}
  
      var test1 = 7 + "Test"
      var test2 = "7" + "test"
      var numTest = 3 + 7 + "Test"
  
      var strTest1 = "It's OK"
      var strTest2 = "I can 'use' this"
      var strTest3 = 'I can do "this" too'
  
      var floatNum1 = 33.0
      var intNum = 33
      var floatNum2 = 37.1
      var floatNum3 = 33.00
  
      var expNum1 = 123e5
      var expNum2 = 123e-5
  
      var num1 = 3, num2 = 3, num3 = 7
      var boolRes1 = (num1 === num2)
      var boolRes2 = (num1 === num3)
  
      var cars = ["BMW", "Volvo", "Audi"]
  
      var person = {name: "Sanghoon", major: "Electronics"}
  
      var undef
  
      for(var i = 0; i < 3; i++) {
          console.log("test i = " + i)
      }
  
      if (num1 !== 10) {
          console.log("num !== 10")
      } else {
          console.log("num === 10")
      }
  
      return (
          <div className="DataType">
              <p>
                  {length}, {lastName}, {x.toString()}.
              </p>
              <p>
                  {x.firstName}, {x.lastName}.
              </p>
              <p>
                  {test1}, {test2}
              </p>
              <p>
                  {numTest}
              </p>
              <p>
                  {strTest1}<br/>
                  {strTest2}<br/>
                  {strTest3}<br/>
              </p>
              <p>
                  {floatNum1}, {intNum}, {floatNum2}, {floatNum3}
              </p>
              <p>
                  {expNum1}, {expNum2}
              </p>
              <p>
                  {boolRes1.toString()}, {boolRes2.toString()}
              </p>
              <p>
                  {cars[0]}, {cars[1]}, {cars[2]}
              </p>
              <p>
                  {person.name}, {person.major}
              </p>
              <p>
                  {typeof ""}, {typeof "test"}, {typeof 0}, {typeof 3.14}, 
                  {typeof true}, {typeof undef}, {typeof undefined}, {typeof null}, <br/>
                  {typeof {name: 'Test', major: 'EE'}}, {typeof [1, 2, 3, 4]}, 
                  {typeof function test(){}}<br/>             
              </p>
          </div>
      );
  }
  
  export default DataType;
  