Variables

JavaScript variables are containers for storing data values. The let keyword is used to define a variable that can be reassigned, and the const keyword to define a variable that cannot be reassigned. All JavaScript variables must be identified with unique names. Identifiers can be short names (like x and y) or more descriptive names (age, sum, totalVolume).

Example


    let greeting = "Hello";     //'let' means the variable can be reassigned. This a variable of a string datatype

    const question = "How are you";     //'const' means the variable cannot be reassigned

    let num = 7;    //this is a variable of a number datatype

All JavaScript variables must be identified with unique names. Identifiers can be short names (like x and y) or more descriptive names (age, sum, total, volume). The general rules for constructing variable names are:

Names can contain letters, digits, underscores, and dollar signs.
Names must begin with a letter
Names can also begin with $ and _
Names are case sensitive (y and Y are different variables)
Reserved words (like JavaScript keywords) cannot be used as names

Exercise

Follow the instructions below by filling in the missing spaces in the code.

Create a variable called city, and assign it the value joburg
create a varibale called age, and assign it the value 22

//1
let  = "";

//2
let  = ;

  try Again!