Kotlin's basic data types

 

Data Type	Description	Size (bits)	Range/Values	Example
Numeric
Byte	Signed integer	8	-128 to 127	10, -5
Short	Signed integer	16	-32768 to 32767	10000, -2000
Int	Signed integer	32	-2,147,483,648 to 2,147,483,647	123456789, -1000000
Long	Signed integer	64	-9,223,372,036,854,775,808 to 9,223,372,036,854,775,807	1000000000000, -5000000000
Float	Floating-point	32	±1.40129846432481707e-45 to ±3.40282346638528860e+38	3.14f, -2.5f
Double	Floating-point	64	±4.94065645841246544e-324 to ±1.79769313486231570e+308	3.14159, -2.71828
Text
Char	Single character	16	Any valid Unicode character	'a', '?', '한'
String	Sequence of characters	Variable		"Hello", "Kotlin"
Boolean
Boolean	Boolean value		true, false
Other
Array	Fixed-size collection of elements of the same type	Variable		arrayOf(1, 2, 3), arrayOf("a", "b")

Notes:

• Size: The size of String and Array types is dynamic and depends on the content.
• Boolean size: The exact size of a Boolean isn't precisely defined in the language specification and can vary depending on the JVM implementation and platform. It's often optimized to be efficient.
• Character size: Kotlin uses UTF-16 encoding for characters, so each Char takes 16 bits (2 bytes).

This table gives you a good overview of Kotlin's basic data types. Remember that efficient memory management is often handled by the Kotlin compiler and the JVM, so you usually don't need to worry about the exact size of these types in your everyday coding.