diff --git a/package.json b/package.json
index a38dd56..1426dbf 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,8 @@
   "main": "jest",
   "scripts": {
     "test": "jest",
-    "prepare": "husky install"
+    "prepare": "husky install",
+    "node": "node src/transpose/index.js"
   },
   "keywords": [],
   "author": "",
diff --git a/src/brackets/index.js b/src/brackets/index.js
index 96b6766..43677fc 100644
--- a/src/brackets/index.js
+++ b/src/brackets/index.js
@@ -4,6 +4,28 @@
  * @param {string} str The string of brackets.
  * @returns {"valid" | "invalid"} Whether or not the string is valid.
  */
-function isValid(str) {}
+function isValid(str) {
+    let bracket = [];
+    let opening = '({[';
+    let closing = ')}]';
+    let matching = {
+      ')': '(',
+      '}': '{',
+      ']': '[',
+    };
+  
+for(let i =0; i <str.length; i++) { 
+      if (opening.includes(str[i])) {
+        bracket.push(str[i]);
+      } else if (closing.includes(str[i])) {
+        const lastBracket = bracket.pop();
+        if (matching[str[i]] !== lastBracket) {
+          return 'invalid';
+        }
+      }
+    }
+  
+    return bracket.length === 0 ? 'valid' : 'invalid';
+}
 
 module.exports = isValid;
diff --git a/src/roman-numerals/index.js b/src/roman-numerals/index.js
index 38afb19..ffc0811 100644
--- a/src/roman-numerals/index.js
+++ b/src/roman-numerals/index.js
@@ -4,6 +4,29 @@
  * @param {string} roman The all-caps Roman numeral between 1 and 3999 (inclusive).
  * @returns {number} The decimal equivalent.
  */
-function romanToDecimal(roman) {}
+function romanToDecimal(num) {
+  let Roman = {
+    I: 1,
+    V: 5,
+    X: 10,
+    L: 50,
+    C: 100,
+    D: 500,
+    M: 1000,
+  };
+  let result = 0;
+  for (let i = 0; i < num.length; i++) {
+    const currSym = Roman[num[i]];
+    const nextSym = Roman[num[i + 1]];
+
+    if (nextSym && nextSym > currSym) {
+      result += nextSym - currSym;
+      i++;
+    } else {
+      result += currSym;
+    }
+  }
+  return result;
+}
 
 module.exports = romanToDecimal;
diff --git a/src/transpose/index.js b/src/transpose/index.js
index adec201..fb2842b 100644
--- a/src/transpose/index.js
+++ b/src/transpose/index.js
@@ -4,6 +4,8 @@
  * @param {number[]} array The array to transpose
  * @returns {number[]} The transposed array
  */
-function transpose(array) {}
+function transpose(array) {
+  return array[0].map((col, index) => array.map((row) => row[index]));
+}
 
 module.exports = transpose;