diff --git a/difference.js b/difference.js
index ba76f72..e9254cf 100644
--- a/difference.js
+++ b/difference.js
@@ -1,4 +1,8 @@
 function difference(array, values) {
+    if (!Array.isArray(array) || !Array.isArray(values)) {
+        throw new Error('배열 정보를 입력하세요!');
+    }
+
     const newArray = array.filter((item) => !values.includes(item));
     return newArray;
 }
diff --git a/last.js b/last.js
new file mode 100644
index 0000000..c1fca1a
--- /dev/null
+++ b/last.js
@@ -0,0 +1,11 @@
+function last(array) {
+    if (!Array.isArray(array)) {
+        throw new Error('배열 정보를 입력하세요!');
+    }
+
+    if (array.length === 0) {
+        return undefined;
+    } else {
+        return array[array.length - 1];
+    }
+}
diff --git a/tempCodeRunnerFile.js b/tempCodeRunnerFile.js
new file mode 100644
index 0000000..8bd9e94
--- /dev/null
+++ b/tempCodeRunnerFile.js
@@ -0,0 +1 @@
+return undefined;
\ No newline at end of file