diff --git a/dropRight.js b/dropRight.js
new file mode 100644
index 0000000..4af6c8b
--- /dev/null
+++ b/dropRight.js
@@ -0,0 +1,23 @@
+function dropRight(arr, n = 1) {
+    if (!Array.isArray(arr)) {
+        throw new Error('배열을 입력하세요!');
+    }
+
+    if (arr.length === 0) {
+        return [];
+    }
+    if (n <= 0) {
+        return arr;
+    }
+
+    const result = [];
+
+    for (let i = 0; i < arr.length - n; i++) {
+        result.push(arr[i]);
+    }
+
+    return result;
+}
+//console.log(dropRight([1, 2, 3], 2));
+
+export default dropRight;
diff --git a/nth.js b/nth.js
new file mode 100644
index 0000000..825b8cb
--- /dev/null
+++ b/nth.js
@@ -0,0 +1,19 @@
+function nth(arr, n = 0) {
+    if (!Array.isArray(arr)) {
+        throw new Error('배열을 입력하세요!');
+    }
+    // if (!Number.isInteger(n)) {
+    //     return arr[0];
+    // }
+    // if (n >= 0) {
+    //     return arr[n];
+    // } else if (n < 0) {
+    //     return arr[arr.length + n];
+    // }
+    return (
+        Array.isArray(arr) &&
+        (Number.isInteger(n) ? (n >= 0 ? arr[n] : arr[arr.length + n]) : arr[0])
+    );
+}
+
+module.exports = nth;