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# 1.5 자료형 // 1. Number Typelet num1 = 27;let num2 = 1.5;let num3 = -20;let inf = Infinity;let mInf = -Infinity;let nan = NaN;// 2. String Typelet myName = "이정환";let myLocation = "목동";let introduce = myName + myLocation;let introduceText = `${myName}은 ${myLocation}에 거주합니다`; // 백틱// 3. Boolean Typelet isSwitchOn = true;let isEmpty = false;// 4. Null Type (아무것도 없다)let empty = null;// 5. Undefined T..