final

solutions.js

@@ -0,0 +1,80 @@
+
+function makeCounter(num) {
+  let startingValue = num;
+  return function() {
+    startingValue += 1;
+    return startingValue;
+  };
+}
+
+function makeFriendList() {
+  const myArr = [];
+  return {
+    addFriend(friend) {
+      myArr.push(friend);
+      return `${friend} successfully added.`;
+    },
+    removeFriend(friend) {
+      if (myArr.includes(friend)) {
+        myArr.splice(myArr.indexOf(friend), 1);
+        return `${friend} successfully removed.`;
+      }
+      return `${friend} not found.`;
+    },
+    displayFriends() {
+      return myArr;
+    },
+  };
+}
+
+function Teacher(name, school, grade, subject, students = []) {
+  this.name = name;
+  this.school = school;
+  this.grade = grade;
+  this.subject = subject;
+  this.students = students;
+}
+Teacher.prototype.addStudent = function(studentstr) {
+  this.students.push(studentstr);
+  return this.students.length;
+};
+
+Teacher.prototype.changeSchools = function (newSchool) {
+  this.school = newSchool;
+  return newSchool;
+};
+
+
+function Quadrilateral(side1, side2, side3, side4) {
+  this.side1 = side1;
+  this.side2 = side2;
+  this.side3 = side3;
+  this.side4 = side4;
+  this.getPerimeter = function() {
+    const total = this.side1 + this.side2 + this.side3 + this.side4;
+    return total;
+  };
+}
+
+
+function Rectangle(length, width) {
+  Quadrilateral.call(this);
+  this.side1 = length;
+  this.side2 = width;
+  this.side3 = length;
+  this.side4 = width;
+}
+
+Rectangle.prototype = Object.create(Quadrilateral.prototype);
+
+Rectangle.prototype.getArea = function() {
+  const area = this.side1 * this.side2;
+  return area;
+};
+module.exports = {
+  makeCounter,
+  makeFriendList,
+  Teacher,
+  Quadrilateral,
+  Rectangle,
+};