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    5.   Lists Blocks: These blocks help you store and manage collections of items. You
                         can add, remove or find items in a list. Example:

                               create empty list   Creates an empty list with no element.

                               length of list  list  Returns the number of items in the list.

                     6.  Dictionaries Blocks: These blocks store data in key-value pairs. They help you
                         organise and access information using labels. Example:

                                                  This block creates  a dictionary  without  any key-value
                           create empty dictionary
                                                  pairs.

                             remove entry for key  This block removes the key-value mapping in the dictionary
                                 from dictionary  for the given key.

                     7.  Colors Blocks: These blocks allow you to pick and use colours in your app. You
                         can set background colours or text colours using these. Example:

                                                   This basic colour block is a small square block that shows
                                                  a  specific  colour  in  the  middle,  representing  the  colour
                                                  stored inside it.

                       make color  make a list  255  This block takes in a list of 3 or 4 numbers. These numbers
                                           0
                                           0      in this list represent values in an RGB code.

                     8.  Variables Blocks: These blocks store values that can change while the app runs.
                         You can create, set and get variable values. Example:

                                                  This block allows you to access and use the current value
                                       get
                                                  stored in a variable.

                                                  This block assigns a new value to a variable. Like the get
                                     set   to
                                                  block, only variables within scope appear in the drop-down.

                                                                                    Creating Apps with MIT App Inventor  133

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