diff --git a/Exercises/.prettierrc b/Exercises/.prettierrc
new file mode 100644
index 0000000..15e3873
--- /dev/null
+++ b/Exercises/.prettierrc
@@ -0,0 +1,7 @@
+{
+    "trailingComma": "es5",
+    "tabWidth": 2,
+    "semi": true,
+    "singleQuote": true,
+    "space-before-function-paren": ["error", "never"]
+}
diff --git a/Exercises/1-power.js b/Exercises/1-power.js
index 83226d2..69be202 100644
--- a/Exercises/1-power.js
+++ b/Exercises/1-power.js
@@ -2,14 +2,14 @@
 
 // Define function power(exp, n), the same as Math.pow(n, exp)
 // but with reverse order of arguments.
-const power = null;
+const power = (exp, n) => Math.pow(n, exp);
 
 // Implement function `square(n)`, which returns square of its argument.
 // The function may or may not reuse function `power`.
-const square = null;
+const square = (n) => power(2, n);
 
 // Implement function `cube(n)` using partial application
 // The function should return cube of argument (to the power of three).
-const cube = null;
+const cube = power.bind(null, 3);
 
 module.exports = { power, square, cube };
diff --git a/Exercises/2-closure.js b/Exercises/2-closure.js
index d6f2435..a419f96 100644
--- a/Exercises/2-closure.js
+++ b/Exercises/2-closure.js
@@ -3,13 +3,13 @@
 const coffee = (volume, strength) =>
   `Coffee volume: ${volume}ml, strength: ${strength}`;
 
-const defineCoffeeType = volume => strength => coffee(volume, strength);
+const defineCoffeeType = (volume) => (strength) => coffee(volume, strength);
 
 // Use function defineCoffeeType to define new coffee types.
 // Define coffee type espresso which volume should equal 50ml.
 // Define coffee type americano which volume should equal 150ml.
 
-const espresso = null;
-const americano = null;
+const espresso = defineCoffeeType(50);
+const americano = defineCoffeeType(150);
 
 module.exports = { espresso, americano };
diff --git a/Exercises/3-lambda.js b/Exercises/3-lambda.js
index 994caa8..5fd5aea 100644
--- a/Exercises/3-lambda.js
+++ b/Exercises/3-lambda.js
@@ -6,6 +6,10 @@ const tagged = (pref, str) => `[${pref}] ${str}`;
 // E.g. tagDate('My String') === '[2019-11-14] My String'
 // Use function tagged to implement tagDate.
 
-const tagDate = null;
+const tagDate = (str) => {
+  const currentDate = new Date();
+  const formattedDate = currentDate.toISOString().substring(0, 10);
+  return tagged(formattedDate, str);
+};
 
 module.exports = { tagDate };
diff --git a/Exercises/4-bind.js b/Exercises/4-bind.js
index 1d1849a..48faf1c 100644
--- a/Exercises/4-bind.js
+++ b/Exercises/4-bind.js
@@ -10,16 +10,16 @@
 */
 
 const H = (exp, ...args) => {
-  const sum = args.reduce((s, a) => (s + Math.pow(a, exp)), 0);
+  const sum = args.reduce((s, a) => s + Math.pow(a, exp), 0);
   const avg = sum / args.length;
-  return Math.pow(avg, (1 / exp));
+  return Math.pow(avg, 1 / exp);
 };
 
 // Use method bind() to create new functions from function H.
 // Create function `average` that returns arithmetic mean (H₁) of the arguments.
 // Create function `rootMeanSquare` that returns quadratic mean (H₂).
 
-const average = null;
-const rootMeanSquare = null;
+const average = H.bind(null, 1);
+const rootMeanSquare = H.bind(null, 2);
 
 module.exports = { average, rootMeanSquare };
diff --git a/Exercises/5-curry.js b/Exercises/5-curry.js
index e175699..5078ec7 100644
--- a/Exercises/5-curry.js
+++ b/Exercises/5-curry.js
@@ -6,8 +6,17 @@ const checkPin = (...code) => code.join('') === EXPECTED_PIN;
 
 // Define function curry that accepts the length of the function
 // (amount of function arguments) and the function.
-
-const curry = (length, fn) => (...args) => null;
+// prettier-ignore
+const curry =
+  (length, fn) =>
+    (...args) => {
+      if (length > args.length) {
+        const f = fn.bind(null, ...args);
+        return curry(length - 1, f);
+      } else {
+        return fn(...args);
+      }
+    };
 
 // Allows to enter pin code by one character,
 // Usage: press('3')('4')('5')('6')
diff --git a/Exercises/6-chaining.js b/Exercises/6-chaining.js
index e768528..cee2c54 100644
--- a/Exercises/6-chaining.js
+++ b/Exercises/6-chaining.js
@@ -10,6 +10,14 @@ const checkPin = (...code) => code.join('') === EXPECTED_PIN;
 //
 // For hint use https://github.com/HowProgrammingWorks/Cheatsheet
 
-const press = null;
+const press = (n) => {
+  const pin = [n];
+  const data = {};
+  data.press = (n) => {
+    pin.push(n);
+    return pin.length === 4 ? checkPin(...pin) : data;
+  };
+  return data;
+};
 
 module.exports = { press };
diff --git a/package.json b/package.json
index ebfc0c9..c4de81a 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,7 @@
   "author": "Timur Shemsedinov <timur.shemsedinov@gmail.com>",
   "license": "MIT",
   "scripts": {
-    "test": "eslint ./Exercises; hpw",
+    "test": "eslint ./Exercises && hpw",
     "ci": "eslint ./Exercises && hpw"
   },
   "dependencies": {