Update 581-data-append.markdown

Author: Joe7M

_build/reference/581-data-append.markdown

@@ -1,27 +1,58 @@
 # APPEND
 
-> APPEND a, val [, val [, ...]]
+> APPEND a, var1 [, var2 [, ..., varN]]
 
-Inserts the values at the end of the specified array.
+Inserts the values `var1` to `varN` at the end of the array `a`. `var1` to `varN` can be any data type.
+
+Instead of APPEND the `<<` Operator can be used.
 
 
-* a - An array-variable.
-* val - Any value or expression
+### Example 1: Append single number
 
 ```
 a = [1,2,3]
 print "Before APPEND: "; a
 
 APPEND a, 4
 print "After APPEND : "; a
+
+' Output:
+' Before APPEND: [1,2,3]
+' After APPEND : [1,2,3,4]
 ```
 
-Instead of APPEND the `<<` Operator can be used.
+### Example 2: Append multiple numbers
+
+```
+a = [1,2,3]
+
+APPEND a, 4, 5
+print a              ' Output: [1,2,3,4,5]
+```
+
+### Example 3: Append an array
+
+```
+a = [1,2,3]
+
+APPEND a, [4,5,6]
+print a              ' Output: [1,2,3,[4,5,6]]
+```
+
+### Example 4: Append a string
+
+```
+a = ["a", "b", "c"]
+
+APPEND a, "d"
+print a                 ' Output: [a,b,c,d]
+```
+
+### Example 5: Using << operator
 
 ```
 a = [1,2,3]
-print "Before << operaror: "; a
 
 a << 4
-print "After << operator : "; a
+print a                  ' Output: [1,2,3,4]
 ```