All variables and functions
with the global scope
are properties of either
the global object
or
the window object.
If the JavaScript code
is running in a browser,
all global variables and functions
are properties of the window object.
JavaScript can also be run on
the terminal of your operating system.
If the JavaScript code is run on a terminal,
all global variables and functions
are properties of the global object.
Since all examples in the Academy are
run in a browser window,
all global variables and functions are
properties of the window object.
For example, the function console.log
that we use to display an output
is a method of the window object.
In the example given above,
both console.log
and
window.console.log will be able
to show the output.
But we do not need to explicitly prefix with the
window. dot notation to access
variables and functions in the global scope.
Do note that, all global variables
that are declared with the
const and let keywords
do not become properties of
the global or window objects.
A variable declared without using
the const or let keywords
becomes a property of
the global or window objects.
However, declaring a variable
without using the const or let keywords
is a bad practice
and
it should be avoided.
We can add properties
to the global or window objects,
using the dot or bracket notations.
In the example given above,
we added a property window["full name"]
to the window object.
We can only access this property
using the bracket notation
because full name on its own
is not a valid variable name.