diff --git a/doitchuu/CorrectParentheses.js b/doitchuu/CorrectParentheses.js
new file mode 100644
index 0000000..a0cc10d
--- /dev/null
+++ b/doitchuu/CorrectParentheses.js
@@ -0,0 +1,17 @@
+function solution(s) {
+    if (s[0] === ")") {
+        return false;
+    }
+
+    const stack = [];
+
+    for (let i = 0; i < s.length; i++) {
+        if (s[i] === "(") {
+            stack.push("(");
+        } else {
+            stack.pop();
+        }
+    }
+
+    return stack.length > 0 ? false : true;
+}
diff --git a/doitchuu/JadenCaseString.js b/doitchuu/JadenCaseString.js
new file mode 100644
index 0000000..762292c
--- /dev/null
+++ b/doitchuu/JadenCaseString.js
@@ -0,0 +1,6 @@
+function solution(s) {
+    return s.split(" ").map((char) => {
+        if (char.length === 0) return "";
+        return char[0].toUpperCase() + char.slice(1).toLowerCase();
+    }).join(" ");
+}
diff --git a/doitchuu/MaximumAndMinimum.js b/doitchuu/MaximumAndMinimum.js
new file mode 100644
index 0000000..8ee5f68
--- /dev/null
+++ b/doitchuu/MaximumAndMinimum.js
@@ -0,0 +1,4 @@
+function solution(s) {
+    const numList = s.split(" ").sort((a, b) => a - b);
+    return numList[0] + " " + numList[numList.length - 1];
+}