Variables

What it is

Variable is a key-value pair, name = value. A variable is used to save data into RAM. This means, that where app is closed, variables are deleted.

Variable types

Boolean

1 or 0

Boolean is a variable that can be either true (1) or false (0). It's directly usable in if statement.

Number

20.35, 25, 27.5

Number (programmatically known as Double) is a variable that can save most numbers (some are too big). It has double precision.

String

foo, bar, hello

String is a variable that can save text.

Map

a = str, b = hello

Map is a list of key-value pairs. Get and save data to it by keys, have same rules as variable names.

List

0 = hello, 1 = hi

A list (known as array) is a variable that works as map, but instead of string as key, it uses offset number. This means, that the first value has index of 0. The last has Length - 1.

Widgets

A widget is a variable too. A variable with the same name as id of the widget is used to save reference and to use it in blocks such as setText.

Components

Components are saved in variable, same as widgets, they're saved to keep a reference to use it in future.

Naming rules

A variable must have at least one character(can be either case). It must start with a character, then it can contain any number of characters, numbers or dashes. In RegEx, it would be written as ''' [a-zA-Z][a-zA-Z1-9-]* '''

Must not be duplicate name. See Why you can't have duplicate names.