Feder: Reference Manual

Lamda functions

In Feder a lambda is a function which can use variables declared in previous funcbody scopes. Lambdas are treated as functions with bound arguments, where the bound arguments are variables, used in the lambda funcbody, from previous funcbody scopes. These bound variables must be initialized and will be passed by using call-by-reference (can also be achieved with Box{type}). Variables in vardecls are passed by using call-by-value (like normal function parameters).

Example:

status = "0"
printStatus := lambda 
		null io.out.println("Status: " + status)
	;
printStatus() // prints "Status: 0"
status = "1"
printStatus() // prints "Status: 1"