London | 26-ITP-May | Raihan Sharif | Sprint 1 | Destructuring exercises

Sprint-1/destructuring/exercise-1/exercise.js

@@ -6,7 +6,7 @@ const personOne = {
 
 // Update the parameter to this function to make it work.
 // Don't change anything else.
-function introduceYourself(___________________________) {
+function introduceYourself({ name, age, favouriteFood }) {
   console.log(
     `Hello, my name is ${name}. I am ${age} years old and my favourite food is ${favouriteFood}.`
   );

Sprint-1/destructuring/exercise-2/exercise.js

@@ -70,3 +70,42 @@ let hogwarts = [
     occupation: "Teacher",
   },
 ];
+
+function logPeopleByHouse(peopleList, houseName) {
+  peopleList.forEach(({ house, firstName, lastName }) => {
+    if (house === houseName) {
+      console.log(`${firstName} ${lastName}`);
+    }
+  });
+}
+
+function logTeachersWithPets(peopleList) {
+  peopleList.forEach(({ occupation, pet, firstName, lastName }) => {
+    if (occupation === "Teacher" && pet !== null) {
+      console.log(`${firstName} ${lastName}`);
+    }
+  });
+}
+
+// I thought I'd make a more general version which can work for any condition
+// though there are no checks for invalid input
+function getPersonByPredicate(list, predicate) {
+  list.forEach((person) => {
+    if (predicate(person)) {
+      const { firstName, lastName } = person;
+      console.log(`${firstName} ${lastName}`);
+    }
+  });
+}
+/* 
+Example usable of the above general purpose version which allows the user to filter by different
+properties. 
+
+getPersonByPredicate(hogwarts, (person) => person.house === "Gryffindor");
+
+getPersonByPredicate(
+  hogwarts,
+  (person) => person.occupation === "Teacher" && person.pet
+);
+
+*/

Sprint-1/destructuring/exercise-3/exercise.js

@@ -6,3 +6,30 @@ let order = [
   { itemName: "Hot Coffee", quantity: 2, unitPricePence: 100 },
   { itemName: "Hash Brown", quantity: 4, unitPricePence: 40 },
 ];
+
+// helper function that pads each item in a line by a certain amount
+function formatReceiptEntry(quantity, itemName, total) {
+  const qtyWidth = 8;
+  const itemWidth = 20;
+
+  return `${String(quantity).padEnd(qtyWidth)}${itemName.padEnd(itemWidth)}${total}`;
+}
+
+function printReceipt(order) {
+  // print header
+  console.log(formatReceiptEntry("QTY", "ITEM", "TOTAL"));
+
+  let total = 0;
+
+  // print each line item
+  order.forEach(({ quantity, itemName, unitPricePence }) => {
+    const price = ((quantity * unitPricePence) / 100).toFixed(2);
+    console.log(formatReceiptEntry(quantity, itemName, price));
+    total += quantity * unitPricePence;
+  });
+
+  // print total
+  console.log(`\nTotal: ${(total / 100).toFixed(2)}`);
+}
+
+printReceipt(order);