README.adoc: example programs updated

README.adoc

@@ -68,7 +68,7 @@ import (
 
 func main() {
 	ctx := expr.NewSimpleVarStore()
-	ctx.SetVar("var", int64(4))
+	ctx.SetVar("var", 4)
 
 	source := `(3-1)*(10/5) == var`
 
@@ -101,7 +101,7 @@ import (
 
 func main() {
 	ctx := expr.NewSimpleVarStore()
-	ctx.SetVar("var", int64(4))
+	ctx.SetVar("var", 4)
 
 	source := `(3-1)*(10/5) == var`
 
@@ -121,14 +121,13 @@ package main
 
 import (
 	"fmt"
-
 	"git.portale-stac.it/go-pkg/expr"
 )
 
 func main() {
 	source := `(3-1)*(10/5) == var`
 
-	if result, err := expr.EvalStringA(source, expr.Arg{"var", int64(4)}); err == nil {
+	if result, err := expr.EvalStringA(source, expr.Arg{"var", 4}); err == nil {
 		fmt.Printf("%q -> %v [%T]\n", source, result, result)
 	} else {
 		fmt.Println("Error calculating the expression:", err)
@@ -237,7 +236,28 @@ Currently, boolean operations are evaluated using _short cut evaluation_. This m
 ====
 
 ==== List
-#TODO: List operations#
+_Expr_ supports list of mixed-type values, also specified by normal expressions.
+
+.List examples
+[source,go]
+----
+[1, 2, 3]                   // List of integers
+["one", "two", "three"]     // List of strings
+["one", 2, false, 4.1]      // List of mixed-types
+["one"+1, 2.0*(9-2)]        // List of expressions
+[ [1,"one"], [2,"two"]]     // List of lists
+----
+
+
+.List operators
+[cols="^2,^2,5,4"]
+|===
+| Symbol    | Operation     | Description               | Examples
+
+| [blue]`+` | _Join_ | Joins two lists | [blue]`[1,2] + [3]` _[ [1,2,3] ]_
+
+| [blue]`-` | _Difference_ | Left list without elements in the right list  | [blue]`[1,2,3] - [2]` _[ [1,3] ]_
+|===
 
 === Variables
 #TODO: variables#