How to Create Your Own Shopping List App in MIT App Inventor

How to Create Your Own Shopping List App in MIT App Inventor

create empty list


Creates an empty list with no elements.

make a list


Creates a list from the given blocks. If you don’t supply any arguments, this creates an empty list, which you can add elements to later. This block is a mutator. Clicking the blue plus sign will allow you to add additional items to your list.

add items to list


Adds the given items to the end of the list. The difference between this and append to list is that append to list takes the items to be appended as a single list while add items to list takes the items as individual arguments. This block is a mutator.

is in list


If thing is one of the elements of the list, returns true; otherwise, returns false. Note that if a list contains sublists, the members of the sublists are not themselves members of the list. For example, the members of the list (1 2 (3 4)) are 1, 2, and the list (3 4); 3 and 4 are not themselves members of the list.

length of list


Returns the number of items in the list.

is list empty


If list has no items, returns true; otherwise, returns false.

pick a random item


Picks an item at random from the list.

index in list


Returns the position of the thing in the list. If not in the list, returns 0.

select list item


Selects the item at the given index in the given list. The first list item is at index 1.

insert list item


Inserts an item into the list at the given position.

replace list item


Inserts replacement into the given list at position index. The previous item at that position is removed.

remove list item


Removes the item at the given position.

append to list


Adds the items in the second list to the end of the first list.

copy list


Makes a copy of a list, including copying all sublists.

is a list?


If thing is a list, returns true; otherwise, returns false.

reverse list


Reverses a copy of the list with items in the reverse order. For example reverse([1,2,3]) returns [3,2,1]

list to csv row


Interprets the list as a row of a table and returns a CSV (comma-separated value) text representing the row. Each item in the row list is considered to be a field, and is quoted with double-quotes in the resulting CSV text. Items are separated by commas. For example, converting the list (a b c d) to a CSV row produces (“a”, “b”, “c”, “d”). The returned row text does not have a line separator at the end.

list to csv table


Interprets the list as a table in row-major format and returns a CSV (comma-separated value) text representing the table. Each item in the list should itself be a list representing a row of the CSV table. Each item in the row list is considered to be a field, and is quoted with double-quotes in the resulting CSV text. In the returned text, items in rows are separated by commas and rows are separated by CRLF (\r\n).

list from csv row


Parses a text as a CSV (comma-separated value) formatted row to produce a list of fields. For example, converting (“a”, “b”, “c”, “d”) to a list produces (a b c d).
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