Oct 16, 20213 min read

Day06: Exploring TypeScript Data Types

In the previous article, we learned about the three methods of specifying types. What types can we use? Today, let's organize the data types that TypeScript might use.

typescript30 tech

Day06: Exploring TypeScript Data Types

In the previous article, we learned about the three methods of specifying types. What types can we use? Today, let's organize the data types that TypeScript might use.

Data Type Classification

I roughly categorize them into three main types:

Primitive Types: string, number, boolean, null, undefined
Object Types: object, arrays, function
Types unique to TypeScript: any, unknown, void, never, union types, intersection types, literal types, tuple, enums

TypeScript Data Type Summary Table

I spent quite a bit of time referencing websites and roughly organized simple usage methods for all types, but I haven't actually applied them in a project yet. I'll take notes while learning (please feel free to correct me if there are any mistakes). In the next few articles, I will introduce each type in detail.

Type	Type Classification	Notes
string	primitive	Defines a string type.
number	primitive	Defines a number type.
boolean	primitive	Defines a boolean type.
null	primitive	Defines a null type, which can also be assigned to all types (not allowed in strict mode).
undefined	primitive	Defines an undefined type, which can also be assigned to all types (not allowed in strict mode).
object	object	Defines an object type.
arrays	object	Can be represented using "type + brackets" or array generics.
function	object	A function has inputs and outputs, and you can specify types for parameters (inputs) and return values (outputs).
any	TS	Represents a type that allows assignment of any type.
unknown	TS	Similar to any, but unknown can only be assigned to any and itself.
void	TS	Represents a function that does not return any value.
never	TS	Represents a type that should not exist, generally used for error handling functions.
union types	TS	Union types allow defining values that can be of multiple types.
intersection types	TS	Intersection types require values to conform to multiple types.
literal types	TS	Certain special "values" can be used as "types."
tuple	TS	A tuple combines different types into one object.
enum	TS	Enum types can be used to manage multiple constants of the same series, used for state judgment.

Let's embark on the TypeScript data type adventure together, and remember to wear your masks 😷 and fasten your seatbelts. Let's go! For examples, refer to this link.

References

https://www.typescriptlang.org/docs/handbook/2/basic-types.html https://willh.gitbook.io/typescript-tutorial/basics/primitive-data-types https://ithelp.ithome.com.tw/articles/10223315 https://ithelp.ithome.com.tw/articles/10217384

Nov 11, 20212 min read

Day30 :I finally finished!

I finally finished! Recently, I went to draw, and here is a drawing of "The Little Prince and the Fox." My favorite part of "The Little Prince" is their story. Drawing is really therapeutic, just like the feeling of finishing this challenge.

typescript30 tech

Nov 9, 20214 min read