diff --git a/JustDevRae/Stack/control_Z.js b/JustDevRae/Stack/control_Z.js
new file mode 100644
index 0000000..44fba87
--- /dev/null
+++ b/JustDevRae/Stack/control_Z.js
@@ -0,0 +1,15 @@
+function solution(s) {
+  var answer = 0;
+  let Z = 0;
+  const controlArray = s.split(" ");
+  for (let i = 0; i < controlArray.length; i++) {
+    if (controlArray[i] == "Z") {
+      answer -= Z;
+      continue;
+    }
+    answer += Number(controlArray[i]);
+    Z = Number(controlArray[i]);
+  }
+
+  return answer;
+}
diff --git a/JustDevRae/Stack/crane_claw_game.js b/JustDevRae/Stack/crane_claw_game.js
new file mode 100644
index 0000000..ab28cd5
--- /dev/null
+++ b/JustDevRae/Stack/crane_claw_game.js
@@ -0,0 +1,23 @@
+function solution(board, moves) {
+  let answer = 0;
+  const stack = [];
+
+  for (let move of moves) {
+    for (let i = 0; i < board.length; i++) {
+      if (board[i][move - 1] !== 0) {
+        let doll = board[i][move - 1];
+        board[i][move - 1] = 0;
+
+        if (stack.length > 0 && stack[stack.length - 1] === doll) {
+          stack.pop();
+          answer += 2;
+        } else {
+          stack.push(doll);
+        }
+        break;
+      }
+    }
+  }
+
+  return answer;
+}
diff --git a/JustDevRae/Stack/dart_game.js b/JustDevRae/Stack/dart_game.js
new file mode 100644
index 0000000..7b67c10
--- /dev/null
+++ b/JustDevRae/Stack/dart_game.js
@@ -0,0 +1,41 @@
+function solution(dartResult) {
+  var answer = 0;
+  const dartResultArray = dartResult.match(/\d+|[SDT]|\#|\*/g);
+  const stack = [];
+  let value;
+  
+  for (str of dartResultArray) {
+    if (str === "S") {
+      value = stack.pop();
+      stack.push(value);
+    } else if (str === "D") {
+      value = stack.pop();
+      stack.push(value * value);
+    } else if (str === "T") {
+      value = stack.pop();
+      stack.push(value * value * value);
+    } else if (str === "*") {
+      let firtPopValue = stack.pop();
+      firtPopValue *= 2;
+      let secondPopValue = stack.pop();
+      if (secondPopValue === undefined) {
+        stack.push(firtPopValue);
+      } else {
+        secondPopValue *= 2;
+        stack.push(secondPopValue);
+        stack.push(firtPopValue);
+      }
+    } else if (str === "#") {
+      value = stack.pop();
+      stack.push(value * -1);
+    } else {
+      stack.push(Number(str));
+    }
+  }
+
+  for (element of stack) {
+    answer += element;
+  }
+
+  return answer;
+}
diff --git a/JustDevRae/Stack/reverse_string.js b/JustDevRae/Stack/reverse_string.js
new file mode 100644
index 0000000..003d086
--- /dev/null
+++ b/JustDevRae/Stack/reverse_string.js
@@ -0,0 +1,10 @@
+function solution(my_string) {
+  var answer = "";
+  const string = [...my_string];
+
+  for (let i = 0; i < my_string.length; i++) {
+    answer += string.pop();
+  }
+
+  return answer;
+}
diff --git a/JustDevRae/Stack/valid_parentheses.js b/JustDevRae/Stack/valid_parentheses.js
new file mode 100644
index 0000000..14767b2
--- /dev/null
+++ b/JustDevRae/Stack/valid_parentheses.js
@@ -0,0 +1,16 @@
+function solution(s) {
+  const stack = [];
+  for (const c of s) {
+    if (c === "(") {
+      stack.push(c);
+    } else if (c === ")") {
+      if (stack.length === 0) {
+        continue;
+      } else {
+        stack.pop();
+      }
+    }
+  }
+
+  return stack.length === 0;
+}