Types

This page explains the types of JSX.

Primitive Types

• boolean
• number
• string
• (int)

Primitive types are non-nullable. 'Int' exists as a type, but would be equal to or slower than using 'number' in some cases (the definition of 'int' is: a number with fraction part == 0 (if it is not NaN nor Infinity), guaranteed to hold a 'number' without fractional part between -2³¹ to 2³¹-1).

Nullable primitive types

• Nullable.<boolean>
• Nullable.<number>
• Nullable.<string>
• (Nullable.<int>)

They are returned by [] operators of Array.<primitive_type> and Map.<primitive_type>.

Built-in Types

The types below are the built-in object types of JSX. Objects types are nullable.

• Object
• Array.<T>
• Map.<T>
• Boolean
• Number
• String
• Function
• JSX

Variant Type

• variant

A variant can hold any type of data (including null). To use the data, explicit cast to other data types is necessary.

User-defined Types

Users may define a new class by extending the Object class, or by declaring an interface or a mixin. See Class, Interface, and Mixin.