Basic Types

The basic data types in JavaScript are:

boolean: a boolean value, either true or false
string: a sequence of characters
number: represents both integer and floating-point (fractional) numbers
undefined: a variable that has not been assigned a value

There are a few others of course, but we'll cover those as they come up.

Declaring Variables

There are several ways to declare variables in JavaScript, and we'll talk about some of the better ways in a second, for now, let's do it the old way. Here are some examples of variables with the types we just discussed:

var isTall = true;
var isCool = false;

var name = "Alice";

var age = 42;

var weight = 150.5;

var brainSize = undefined;

The undefined value is a special value in JavaScript that represents the absence of a value.

Assignment

Assign values to the given variables so that:

smsSendingLimit is a number
hasPermission is a boolean
username is a string
nothing is undefined