diff --git a/ar.bash b/ar.bash
index c1d2fd5..5b40375 100644
--- a/ar.bash
+++ b/ar.bash
@@ -303,13 +303,13 @@ ar::reverse() {
 ## @param arr The array to setify
 ## @param arr_set The array to write the result into
 ar::set() {
-    local -n arr="$1"
-    local -n arr_set="$2"
-    local -A assoc
-    for val in "${arr[@]}"; do
-	assoc[$val]=1
+    local -n _set_arr="$1"
+    local -n _set_arr_set="$2"
+    local -A _set_assoc
+    for val in "${_set_arr[@]}"; do
+	_set_assoc[$val]=1
     done
-    arr_set=("${!assoc[@]}")
+    _set_arr_set=("${!_set_assoc[@]}")
 }
 
 ## @fn ar::in_set()
@@ -501,7 +501,7 @@ ar::is_proper_subset() {
 }
 
 ## @fn ar::is_proper_superset
-## @brief Return true if _proper_superset_arr1 is a superset of _proper_superset_arr2
+## @brief Return 0 if _proper_superset_arr1 is a superset of _proper_superset_arr2
 ## @param _proper_superset_arr1 The first array name
 ## @param _proper_superset_arr2 The second array name
 ## @retval 0 if _proper_superset_arr1 is a superset of _proper_superset_arr2, non-zero otherwise
@@ -519,6 +519,23 @@ ar::is_proper_superset() {
     return 0
 }
 
+## @fn ar::is_disjoint
+## @brief Return 0 if _disjoint_arr1 is a superset of _disjoint_arr2
+## @param _disjoint_arr1 The first array name
+## @param _disjoint_arr2 The second array name
+## @retval 0 if _disjoint_arr1 and _disjoint_arr2 are disjoint sets, non-zero otherwise
+ar::is_disjoint() {
+    local -n _disjoint_arr1="$1"
+    local -n _disjoint_arr2="$2"
+    for i in "${_disjoint_arr1[@]}"; do
+	if ar::in_set _disjoint_arr2 "$i"; then
+	    return 1
+	fi
+    done
+    return 0
+}
+
+
 ## @fn array_to_string
 ## @brief Turn an array into a string with seperator
 ## @param vname_of_array The variable name of the array
diff --git a/examples/longest_consecutive.bash b/examples/longest_consecutive.bash
new file mode 100644
index 0000000..47695f6
--- /dev/null
+++ b/examples/longest_consecutive.bash
@@ -0,0 +1,45 @@
+# Source the library
+. "../ar.bash"
+
+max() {
+    local -i _first="$1"
+    local -i _second="$2"
+    if (( _second > _first)); then
+	echo "$_second"
+    else
+	echo "$_first"
+    fi
+}
+
+## @fn longest_consecutive()
+## @brief Return the count of the longest consecuritve string of numbers
+longest_consecutive() {
+    local -a _arr=("$@")
+    local -a _arr_set
+    local -i cur
+    local -i cnt=0
+    local -i res=0
+    # Setify array
+    ar::set _arr _arr_set
+    for val in "${_arr[@]}"; do
+	if ar::in_set _arr_set "$val" && ! ar::in_set _arr_set $(( val - 1 )); then
+	    cur="$val"
+	    cnt=0
+	    while ar::in_set _arr_set "$cur"; do
+		# Remove number to avoid recomputation
+		ar::remove _arr_set "$cur"
+		(( cur++ ))
+		(( cnt++ ))
+	    done
+	    # Update optimal length
+	    res="$(max "$res" "$cnt")"
+	fi
+    done
+    echo "$res"
+}
+
+main() {
+    echo "$(longest_consecutive 2 6 1 9 4 5 3)"
+}
+
+main "$@"
diff --git a/tests/test_ar.bats b/tests/test_ar.bats
index 549d686..ee4e0f5 100644
--- a/tests/test_ar.bats
+++ b/tests/test_ar.bats
@@ -233,3 +233,17 @@ setup() {
     run ar::is_proper_superset first_arr second_arr
     assert_failure
 }
+
+@test "ar::is_disjoint returns 0 if set1 and set2 are disjoint" {
+    local -a first_arr=(rice beans sausage)
+    local -a second_arr=(beef pasta cheese)
+    run ar::is_disjoint first_arr second_arr
+    assert_success
+}
+
+@test "ar::is_disjoint returns non-zero if set1 and set2 are not disjoint" {
+    local -a first_arr=(rice beans sausage)
+    local -a second_arr=(rice beef beans)
+    run ar::is_disjoint first_arr second_arr
+    assert_failure
+}