diff --git a/.eslintrc.json b/.eslintrc.json
index 69eb1e4..aee727e 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -18,7 +18,7 @@
     ],
     "linebreak-style": [
       "error",
-      "unix"
+      "windows"
     ],
     "quotes": [
       "error",
@@ -265,4 +265,4 @@
       "never"
     ]
   }
-}
+}
\ No newline at end of file
diff --git a/Exercises/1-remove.js b/Exercises/1-remove.js
index 82fba07..a620173 100644
--- a/Exercises/1-remove.js
+++ b/Exercises/1-remove.js
@@ -1,7 +1,9 @@
 'use strict';
 
 const removeElement = (array, item) => {
-  // Remove item from array modifying original array
+  array.forEach((el, i) => {
+    if (el === item) array.splice(i, 1);
+  });
 };
 
 module.exports = { removeElement };
diff --git a/Exercises/2-elements.js b/Exercises/2-elements.js
index 8518c71..dd8a30e 100644
--- a/Exercises/2-elements.js
+++ b/Exercises/2-elements.js
@@ -1,7 +1,12 @@
 'use strict';
 
 const removeElements = (array, ...items) => {
-  // Remove multiple items from array modifying original array
+  items.forEach((el) => {
+    const idx = array.indexOf(el);
+    if (idx !== -1) array.splice(idx, 1);
+  });
+
+  return array;
 };
 
 module.exports = { removeElements };
diff --git a/Exercises/3-unique.js b/Exercises/3-unique.js
index 7dd1012..ad4496c 100644
--- a/Exercises/3-unique.js
+++ b/Exercises/3-unique.js
@@ -1,8 +1,8 @@
 'use strict';
 
-// Create and return a new array without duplicate elements
-// Don't modify initial array
-
-const unique = (array) => [];
+const unique = (array) => {
+  const filtered = array.filter((el, i) => i === array.indexOf(el));
+  return filtered;
+};
 
 module.exports = { unique };
diff --git a/Exercises/4-difference.js b/Exercises/4-difference.js
index 37d24ab..5c5eaec 100644
--- a/Exercises/4-difference.js
+++ b/Exercises/4-difference.js
@@ -1,8 +1,14 @@
 'use strict';
 
-// Find difference of two arrays
-// elements from array1 that are not includes in array2
 
-const difference = (array1, array2) => [];
+const difference = (array1, array2) => {
+  const diffArr = [];
+
+  array1.forEach((el) => {
+    if (!array2.includes(el)) diffArr.push(el);
+  });
+
+  return diffArr;
+};
 
 module.exports = { difference };