Variables Assigning variable could be done by this : Var holiday = 15; We concate in a string return "This month have " + holiday + " holidays"; turn out to be like this : This month have 15 holidays.
Introduction Operation Basic operation that return value : > 12 * 2 + 6 return value : 30 Basic operation that return boolean : > "My name is " + "John" return string : My name is John Length Check We can use .length at the end of our code to indicate system pointing out the length of content/string. > "My name is " + "John" .length return length : 15