shithub: limbobyexample

Info  •  Files  •  Log  •  Branches

add function references example

--- a/Function-Refs/README.md

+++ b/Function-Refs/README.md

@@ -6,14 +6,31 @@

 ## Source

-### 

+### funcrefs.b:18,34

+The variable `fp` is a name whose type is a reference to a function with a given argument and return value scheme. A function which fulfills this scheme can be used to set the reference, in this case the `cmp()` function is referenced by `fp`. 

+### funcrefs.b:36,46

-## Demo

+The `sort()` function takes a function reference as an argument, using it as a comparator. In this case `cmp()` and `rcmp()` are passed as a function reference argument. 

+### funcrefs.b:48,53

+The `choose()` function returns a reference to a function, being called in this case to return a given comparator with the comparator being called in-line.

+## Demo

+

+	; limbo funcrefs.b

+	; funcrefs

+	Matched smiley!

+	Did not match duck

+	[ d b c a]

+	[ a b c d]

+	[ d c b a]

+	quack ≥ quack

+	; 

+

 ## Exercises

 - Change the value of `c` to 1, what happens?

+- Write a function which returns a function which returns a function.

--- a/Function-Refs/funcrefs.b

+++ b/Function-Refs/funcrefs.b

@@ -47,10 +47,10 @@

 	c := 0;

-	if(choose(c)("quack", "quack") <= 0)

-		print("quack ≤ quack\n");

+	if(choose(c)("quack", "quack") >= 0)

+		print("quack ≥ quack\n");

 	else

-		print("quack > quack\n");

+		print("quack < quack\n");

 	exit;

 }

--- a/README.md

+++ b/README.md

@@ -36,6 +36,7 @@

 - [Switch Case](./Switch)

 - [Arrays](./Arrays)

 - [Functions](./Functions)

+- [Function References](./Function-Refs)

 - [Generics, Picks, and Interfaces (kind of)](./Generics)

 ## References