Differences

This shows you the differences between two versions of the page.

--- at:tutorial:basic [2007/04/06 08:08] – * elisag
+++ at:tutorial:basic [2007/04/06 08:12] – elisag
@@ Line 1: / Line 1: @@
 <note>
-**IN PROGRESS!!**
+**IN PROGRESS: FIRST DRAFT!!**
-- TODO: Talk about methods instead of functions? Check iat chapter.
+- TODO: Adding Table splicing, quasi-quoting?
 </note>
 ====== Functional and Imperative Programming ======
@@ Line 149: / Line 149: @@
 As you have probably noticed in the previous examples,  the value returned by a function definition is a closure. Actually in AmbientTalk functions are implemented as named closures.
-The function name can be thus used to refer the function (without calling it). This will also return a closure to that function.
+The function name can be thus used to refer the function (without calling it). This will also return a closure to that function. As an example consider the //makeCell// function:
+<code>
+>def makeCell(val){
+   def getter() { val} ;
+   def setter(v) {val := v};
+  [getter, setter]
+}
+>><closure:makeCell>
+>def [get, set] := makeCell(42);
+>>[<closure:getter>, <closure:setter>]
+</code>
+This example also illustrates how a function can make public some of its local fields or functions by returning them as its return value. The get and set could be then passed as arguments to other functions such as //trustedFunction(get,set)// and  //distrustedFunction(get)//.