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--- at:tutorial:basic [2007/04/05 14:04] – elisag
+++ at:tutorial:basic [2007/04/05 14:32] – elisag
@@ Line 1: / Line 1: @@
 <note>
-**UNDER CONSTRUCTION!!**
+**IN PROGRESS!!**
+- TODO: Talk about methods instead of functions? Check iat chapter.
 </note>
 ====== Functional and Imperative Programming ======
@@ Line 175: / Line 176: @@
 >>3
 </code>
+Blocks are used also to iterating over enumerations. As an example consider the equivalent definition of the //sum// function shown below:
+<code>
+>def sum (@args) {
+  args.inject: 0 into: { |total, next| total + next}
+}
+>><closure:sum>
+>sum(1,2,3)
+>>6
+</code>
+Note that inject is a method invoked to the table //args//. We elaborate on native data types and its operations in the next section.