Functions

Functions and methods are an important part of programming in LSTS.

Function Declaration

Functions are declared with the "let" keyword.

let f(x: U64, y: U64): U64 = x + y;

print( f(123, 456) );

Method Declaration

Methods are declared with a dot before their name.

let .f(self: MyObject, y: U64): U64 = self.x + y;

print( o.f(123) );

Function Expressions and Lambdas.

Function Expressions and Lambdas can be created with the "fn" keyword.

[1,2,3].map( fn f(x: U64): U64 = if x>10 then x*x else f(x-1) );

[1,2,3].map( fn(x: U64): U64 = x*x );