diff --git a/JustDevRae/Hash/make_B_with_A.js b/JustDevRae/Hash/make_B_with_A.js
new file mode 100644
index 0000000..2ce90bb
--- /dev/null
+++ b/JustDevRae/Hash/make_B_with_A.js
@@ -0,0 +1,21 @@
+function solution(before, after) {
+  var answer = 0;
+  const beforeCount = {};
+  const afterCount = {};
+
+  for (const char of before) {
+    beforeCount[char] = (beforeCount[char] || 0) + 1;
+  }
+
+  for (const char of after) {
+    afterCount[char] = (afterCount[char] || 0) + 1;
+  }
+
+  for (const key in beforeCount) {
+    if (beforeCount[key] !== afterCount[key]) {
+      return (answer = 0);
+    }
+  }
+
+  return (answer = 1);
+}
diff --git a/JustDevRae/Hash/morse_code.js b/JustDevRae/Hash/morse_code.js
new file mode 100644
index 0000000..5d70273
--- /dev/null
+++ b/JustDevRae/Hash/morse_code.js
@@ -0,0 +1,37 @@
+function solution(letter) {
+  var answer = "";
+  const morse = {
+    ".-": "a",
+    "-...": "b",
+    "-.-.": "c",
+    "-..": "d",
+    ".": "e",
+    "..-.": "f",
+    "--.": "g",
+    "....": "h",
+    "..": "i",
+    ".---": "j",
+    "-.-": "k",
+    ".-..": "l",
+    "--": "m",
+    "-.": "n",
+    "---": "o",
+    ".--.": "p",
+    "--.-": "q",
+    ".-.": "r",
+    "...": "s",
+    "-": "t",
+    "..-": "u",
+    "...-": "v",
+    ".--": "w",
+    "-..-": "x",
+    "-.--": "y",
+    "--..": "z",
+  };
+  const str = letter.split(" ");
+
+  for (const s of str) {
+    answer += morse[s];
+  }
+  return answer;
+}
diff --git a/JustDevRae/Hash/not_finish_runner.js b/JustDevRae/Hash/not_finish_runner.js
new file mode 100644
index 0000000..e8026cc
--- /dev/null
+++ b/JustDevRae/Hash/not_finish_runner.js
@@ -0,0 +1,21 @@
+function solution(participant, completion) {
+  const obj = {};
+
+  for (const p of participant) {
+    if (obj[p]) {
+      obj[p] += 1;
+    } else {
+      obj[p] = 1;
+    }
+  }
+
+  for (const c of completion) {
+    obj[c] -= 1;
+  }
+
+  for (const key in obj) {
+    if (obj[key] > 0) {
+      return key;
+    }
+  }
+}
diff --git a/JustDevRae/Hash/rank_order.js b/JustDevRae/Hash/rank_order.js
new file mode 100644
index 0000000..8d33d58
--- /dev/null
+++ b/JustDevRae/Hash/rank_order.js
@@ -0,0 +1,6 @@
+function solution(score) {
+  const averages = score.map(([english, math]) => (english + math) / 2);
+  const sortedAverages = [...averages].sort((a, b) => b - a);
+
+  return averages.map((avg) => sortedAverages.indexOf(avg) + 1);
+}
diff --git a/JustDevRae/Hash/setting_order_care.js b/JustDevRae/Hash/setting_order_care.js
new file mode 100644
index 0000000..c90c316
--- /dev/null
+++ b/JustDevRae/Hash/setting_order_care.js
@@ -0,0 +1,10 @@
+function solution(emergency) {
+  const sorted = [...emergency].sort((a, b) => b - a);
+  const rankMap = new Map();
+
+  sorted.forEach((value, index) => {
+    rankMap.set(value, index + 1);
+  });
+
+  return emergency.map((value) => rankMap.get(value));
+}
diff --git a/JustDevRae/Queue/card_bundle.js b/JustDevRae/Queue/card_bundle.js
new file mode 100644
index 0000000..1db6617
--- /dev/null
+++ b/JustDevRae/Queue/card_bundle.js
@@ -0,0 +1,15 @@
+function solution(cards1, cards2, goal) {
+  var answer = "";
+  for (let word of goal) {
+    if (word == cards1[0]) {
+      cards1.shift();
+    } else if (word == cards2[0]) {
+      cards2.shift();
+    } else {
+      answer = "No";
+      break;
+    }
+  }
+
+  return (answer = "Yes");
+}
diff --git a/JustDevRae/Queue/find_point_position.js b/JustDevRae/Queue/find_point_position.js
new file mode 100644
index 0000000..4f16fad
--- /dev/null
+++ b/JustDevRae/Queue/find_point_position.js
@@ -0,0 +1,10 @@
+function solution(dot) {
+  var answer = 0;
+
+  if (dot[0] > 0 && dot[1] > 0) answer = 1;
+  if (dot[0] < 0 && dot[1] > 0) answer = 2;
+  if (dot[0] < 0 && dot[1] < 0) answer = 3;
+  if (dot[0] > 0 && dot[1] < 0) answer = 4;
+
+  return answer;
+}
diff --git a/JustDevRae/Queue/login_success.js b/JustDevRae/Queue/login_success.js
new file mode 100644
index 0000000..c3ccabc
--- /dev/null
+++ b/JustDevRae/Queue/login_success.js
@@ -0,0 +1,16 @@
+function solution(id_pw, db) {
+  var answer = "";
+  for (let i = 0; i < db.length; i++) {
+    if (id_pw[0] === db[i][0]) {
+      if (id_pw[1] === db[i][1]) {
+        answer = "login";
+        break;
+      }
+      answer = "wrong pw";
+      break;
+    } else {
+      answer = "fail";
+    }
+  }
+  return answer;
+}
diff --git a/JustDevRae/Queue/make_hamburger.js b/JustDevRae/Queue/make_hamburger.js
new file mode 100644
index 0000000..bda6c56
--- /dev/null
+++ b/JustDevRae/Queue/make_hamburger.js
@@ -0,0 +1,20 @@
+function solution(ingredient) {
+  const burger = [];
+  let answer = 0;
+  for (let i of ingredient) {
+    burger.push(i);
+
+    if (
+      burger.length >= 4 &&
+      burger[burger.length - 4] === 1 &&
+      burger[burger.length - 3] === 2 &&
+      burger[burger.length - 2] === 3 &&
+      burger[burger.length - 1] === 1
+    ) {
+      burger.splice(burger.length - 4, 4);
+      answer++;
+    }
+  }
+
+  return answer;
+}
diff --git a/JustDevRae/Queue/pair_count.js b/JustDevRae/Queue/pair_count.js
new file mode 100644
index 0000000..19f39ac
--- /dev/null
+++ b/JustDevRae/Queue/pair_count.js
@@ -0,0 +1,13 @@
+function solution(n) {
+  var answer = 0;
+
+  // 1부터 n까지 숫자를 확인
+  for (let i = 1; i <= n; i++) {
+    // i가 n의 약수인지 확인
+    if (n % i === 0) {
+      // i가 n의 약수인지 확인
+      answer++;
+    }
+  }
+  return answer;
+}
diff --git a/JustDevRae/Queue/process.js b/JustDevRae/Queue/process.js
new file mode 100644
index 0000000..fcc601e
--- /dev/null
+++ b/JustDevRae/Queue/process.js
@@ -0,0 +1,20 @@
+function solution(priorities, location) {
+  var answer = 0;
+  const queue = priorities.map((priority, index) => ({ priority, index }));
+
+  while (queue.length > 0) {
+    const current = queue.shift();
+
+    const highPriority = queue.some((item) => item.priority > current.priority);
+
+    if (highPriority) {
+      queue.push(current);
+    } else {
+      answer++;
+
+      if (current.index === location) {
+        return answer;
+      }
+    }
+  }
+}
diff --git a/JustDevRae/Set/contains_duplicate.js b/JustDevRae/Set/contains_duplicate.js
new file mode 100644
index 0000000..d5e8bc8
--- /dev/null
+++ b/JustDevRae/Set/contains_duplicate.js
@@ -0,0 +1,4 @@
+var containsDuplicate = function (nums) {
+  const numSet = new Set(nums);
+  return numSet.size !== nums.length;
+};
diff --git a/JustDevRae/Set/pick_random_k_numbers.js b/JustDevRae/Set/pick_random_k_numbers.js
new file mode 100644
index 0000000..e6f3923
--- /dev/null
+++ b/JustDevRae/Set/pick_random_k_numbers.js
@@ -0,0 +1,18 @@
+function solution(arr, k) {
+  const uniqueSet = new Set();
+  const result = [];
+
+  for (const num of arr) {
+    if (!uniqueSet.has(num)) {
+      uniqueSet.add(num);
+      result.push(num);
+    }
+    if (result.length === k) break;
+  }
+
+  while (result.length < k) {
+    result.push(-1);
+  }
+
+  return result;
+}
diff --git a/JustDevRae/Set/prime_factorization.js b/JustDevRae/Set/prime_factorization.js
new file mode 100644
index 0000000..b25b010
--- /dev/null
+++ b/JustDevRae/Set/prime_factorization.js
@@ -0,0 +1,15 @@
+function solution(n) {
+  let result = [];
+  let divisor = 2;
+
+  while (n > 1) {
+    if (n % divisor === 0) {
+      result.push(divisor);
+      n /= divisor;
+    } else {
+      divisor++;
+    }
+  }
+
+  return [...new Set(result)];
+}
diff --git a/JustDevRae/Set/remove_duplicate_chars.js b/JustDevRae/Set/remove_duplicate_chars.js
new file mode 100644
index 0000000..fa33417
--- /dev/null
+++ b/JustDevRae/Set/remove_duplicate_chars.js
@@ -0,0 +1,4 @@
+function solution(my_string) {
+  var answer = [...new Set(my_string)].join("");
+  return answer;
+}
diff --git a/JustDevRae/Set/unique_chars_only.js b/JustDevRae/Set/unique_chars_only.js
new file mode 100644
index 0000000..18ddb6b
--- /dev/null
+++ b/JustDevRae/Set/unique_chars_only.js
@@ -0,0 +1,16 @@
+function solution(s) {
+  const charSet = new Set();
+  const duplicateSet = new Set();
+
+  for (const char of s) {
+    if (charSet.has(char)) {
+      duplicateSet.add(char);
+    } else {
+      charSet.add(char);
+    }
+  }
+
+  const uniqueChars = [...charSet].filter((char) => !duplicateSet.has(char));
+
+  return uniqueChars.sort().join("");
+}
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;
+}
diff --git a/JustDevRae/Tree/binary_tree_inorder_traversal.js b/JustDevRae/Tree/binary_tree_inorder_traversal.js
new file mode 100644
index 0000000..253bdea
--- /dev/null
+++ b/JustDevRae/Tree/binary_tree_inorder_traversal.js
@@ -0,0 +1,18 @@
+function inorderTraversal(root) {
+  let result = [];
+  let stack = [];
+  let current = root;
+
+  while (current || stack.length) {
+    while (current) {
+      stack.push(current); 
+      current = current.left; 
+    }
+
+    current = stack.pop(); 
+    result.push(current.val); 
+    current = current.right;
+  }
+
+  return result;
+}
diff --git a/JustDevRae/Tree/binary_tree_level_order_traversal.js b/JustDevRae/Tree/binary_tree_level_order_traversal.js
new file mode 100644
index 0000000..04ab782
--- /dev/null
+++ b/JustDevRae/Tree/binary_tree_level_order_traversal.js
@@ -0,0 +1,23 @@
+function levelOrder(root) {
+  if (!root) return [];
+
+  let result = [];
+  let queue = [root];
+
+  while (queue.length > 0) {
+    let level = [];
+    let size = queue.length;
+
+    for (let i = 0; i < size; i++) {
+      let node = queue.shift();
+      level.push(node.val);
+
+      if (node.left) queue.push(node.left);
+      if (node.right) queue.push(node.right);
+    }
+
+    result.push(level);
+  }
+
+  return result;
+}
diff --git a/JustDevRae/Tree/invert_binary_tree.js b/JustDevRae/Tree/invert_binary_tree.js
new file mode 100644
index 0000000..470896b
--- /dev/null
+++ b/JustDevRae/Tree/invert_binary_tree.js
@@ -0,0 +1,10 @@
+function invertTree(root) {
+  if (!root) return null;
+
+  [root.left, root.right] = [root.right, root.left];
+
+  invertTree(root.left);
+  invertTree(root.right);
+
+  return root;
+}
diff --git a/JustDevRae/Tree/maximum_depth_of_binary.js b/JustDevRae/Tree/maximum_depth_of_binary.js
new file mode 100644
index 0000000..900b87d
--- /dev/null
+++ b/JustDevRae/Tree/maximum_depth_of_binary.js
@@ -0,0 +1,5 @@
+function maxDepth(root) {
+  if (!root) return 0;
+
+  return Math.max(maxDepth(root.left), maxDepth(root.right)) + 1;
+}
diff --git a/JustDevRae/Tree/same_tree.js b/JustDevRae/Tree/same_tree.js
new file mode 100644
index 0000000..6ad9cda
--- /dev/null
+++ b/JustDevRae/Tree/same_tree.js
@@ -0,0 +1,10 @@
+function isSameTree(p, q) {
+  
+  if (!p && !q) return true;
+  
+  if (!p || !q) return false;
+  
+  if (p.val !== q.val) return false;
+
+  return isSameTree(p.left, q.left) && isSameTree(p.right, q.right);
+}