diff --git a/docs/docs/literals/array.md b/docs/docs/literals/array.md
index 950d37c..761a4e0 100644
--- a/docs/docs/literals/array.md
+++ b/docs/docs/literals/array.md
@@ -126,6 +126,15 @@ Sorts the array if it contains only one type of STRING, INTEGER or FLOAT
 ' />
 
 
+### sum()
+> Returns `INTEGER`
+
+
+
+
+
+
+
 ### uniq()
 > Returns `ARRAY|ERROR`
 
diff --git a/object/array.go b/object/array.go
index 7ff6a61..c432a58 100644
--- a/object/array.go
+++ b/object/array.go
@@ -196,6 +196,26 @@ func init() {
 				return ao
 			},
 		},
+		"sum": ObjectMethod{
+			Layout: MethodLayout{
+				ReturnPattern: Args(
+					Arg(INTEGER_OBJ),
+				),
+			},
+			method: func(o Object, _ []Object, _ Environment) Object {
+				ao := o.(*Array)
+				var result int
+
+				for i, element := range ao.Elements {
+					if val, ok := element.(Integerable); ok {
+						result += int(val.ToIntegerObj(nil).Value)
+					} else {
+						return NewErrorFormat("Found non number element %s on index %d", element.Type(), i)
+					}
+				}
+				return NewInteger(int64(result))
+			},
+		},
 		"uniq": ObjectMethod{
 			Layout: MethodLayout{
 				ReturnPattern: Args(
diff --git a/object/array_test.go b/object/array_test.go
index 41502d7..b47b549 100644
--- a/object/array_test.go
+++ b/object/array_test.go
@@ -72,6 +72,8 @@ func TestArrayObjectMethods(t *testing.T) {
 		{"[1,2,3,{}].join()", "Found non stringable element HASH on index 3"},
 		{"[1,2,3].join()", "123"},
 		{"[1,2,3].join('-')", "1-2-3"},
+		{"['1',2, 2.5,{}].sum()", "Found non number element HASH on index 3"},
+		{"['1', 2, 2.5].sum()", 5},
 	}
 
 	testInput(t, tests)