From 24619a55422abd18a77e93ca0af8f6b734097fac Mon Sep 17 00:00:00 2001
From: Jhon Mosk <jhon-mosk@yandex.ru>
Date: Wed, 20 Sep 2023 22:27:30 +0300
Subject: [PATCH] labs done

---
 .prettierrc               |  3 +++
 Exercises/1-remove.js     |  3 ++-
 Exercises/2-elements.js   |  5 ++++-
 Exercises/3-unique.js     | 11 ++++++++++-
 Exercises/4-difference.js |  7 ++++++-
 package.json              |  2 +-
 6 files changed, 26 insertions(+), 5 deletions(-)
 create mode 100644 .prettierrc

diff --git a/.prettierrc b/.prettierrc
new file mode 100644
index 0000000..544138b
--- /dev/null
+++ b/.prettierrc
@@ -0,0 +1,3 @@
+{
+  "singleQuote": true
+}
diff --git a/Exercises/1-remove.js b/Exercises/1-remove.js
index 82fba07..178d0b9 100644
--- a/Exercises/1-remove.js
+++ b/Exercises/1-remove.js
@@ -1,7 +1,8 @@
 'use strict';
 
 const removeElement = (array, item) => {
-  // Remove item from array modifying original array
+  const index = array.indexOf(item);
+  if (index !== -1) array.splice(index, 1);
 };
 
 module.exports = { removeElement };
diff --git a/Exercises/2-elements.js b/Exercises/2-elements.js
index 8518c71..455af72 100644
--- a/Exercises/2-elements.js
+++ b/Exercises/2-elements.js
@@ -1,7 +1,10 @@
 'use strict';
 
 const removeElements = (array, ...items) => {
-  // Remove multiple items from array modifying original array
+  for (const item of items) {
+    const index = array.indexOf(item);
+    if (index !== -1) array.splice(index, 1);
+  }
 };
 
 module.exports = { removeElements };
diff --git a/Exercises/3-unique.js b/Exercises/3-unique.js
index 7dd1012..c76cc17 100644
--- a/Exercises/3-unique.js
+++ b/Exercises/3-unique.js
@@ -3,6 +3,15 @@
 // Create and return a new array without duplicate elements
 // Don't modify initial array
 
-const unique = (array) => [];
+const unique = (array) => {
+  const res = [];
+
+  for (const item of array) {
+    const index = res.indexOf(item);
+    if (index === -1) res.push(item);
+  }
+
+  return res;
+};
 
 module.exports = { unique };
diff --git a/Exercises/4-difference.js b/Exercises/4-difference.js
index 37d24ab..c0087f0 100644
--- a/Exercises/4-difference.js
+++ b/Exercises/4-difference.js
@@ -3,6 +3,11 @@
 // Find difference of two arrays
 // elements from array1 that are not includes in array2
 
-const difference = (array1, array2) => [];
+const difference = (array1, array2) =>
+  array1.filter((item) => {
+    const index = array2.indexOf(item);
+    if (index === -1) return item;
+    return false;
+  });
 
 module.exports = { difference };
diff --git a/package.json b/package.json
index f8bd580..53443b6 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": {