Use precise types
Using precise types will
- Improve type checking at compile-time
- Reduces the need for is checks and casts
- Improve tooling experience: e.g., completion
Avoid overuse of var
Type inference allows the program to infer the actual data type of variables.
The use of var is a convenient way to use a generic type for a local variable and helps avoid repeated type declarations.
Code is usually more readable and maintainable when the type is declared explicitly. Therefore var should be used sparingly for variables used within a very limited scope, like in a foreach loop. Overusing it makes the code harder to understand.
Overuse of var
var name = "Alice";
var age = 30;
addUser(name, age);
Good Code
string name = "Alice";
int age = 30;
addUser(name, age);
Use application-defined types
Always use more application-defined type instead of json, any, anydata when you have more to do with that data.
Bad Code
http:Client httpClient = check new ("http://localhost:9090");
json albums = check httpClient->/albums;
Good Code
type Album readonly & record {|
string title;
string artist;
|};
http:Client httpClient = check new ("http://localhost:9090");
Album[] albums = check httpClient->/albums;