Glasgow | 26-ITP-Jan| Martin McLean |Sprint 2|coursework

Sprint-2/debug/address.js

@@ -12,4 +12,5 @@ const address = {
   postcode: "XYZ 123",
 };
 
-console.log(`My house number is ${address[0]}`);
+
+houseNumber: (42, console.log(`My house number is ${address.houseNumber}`));

Sprint-2/debug/author.js

@@ -2,6 +2,7 @@
 
 // This program attempts to log out all the property values in the object.
 // But it isn't working. Explain why first and then fix the problem
+// the "author" is an object so it needs to be in square brackets to be called
 
 const author = {
   firstName: "Zadie",
@@ -11,6 +12,6 @@ const author = {
   alive: true,
 };
 
-for (const value of author) {
+for (const value of [author]) {
   console.log(value);
 }

Sprint-2/debug/recipe.js

@@ -3,13 +3,19 @@
 // This program should log out the title, how many it serves and the ingredients.
 // Each ingredient should be logged on a new line
 // How can you fix it?
+// The recipe is an object so it needs to be in square brackets to be call each element by its key and index.
 
 const recipe = {
   title: "bruschetta",
   serves: 2,
   ingredients: ["olive oil", "tomatoes", "salt", "pepper"],
 };
 
-console.log(`${recipe.title} serves ${recipe.serves}
+console.log(` ${recipe.title} 
+  serves ${recipe.serves}
   ingredients:
-${recipe}`);
+  ${recipe.ingredients[0]}
+  ${recipe.ingredients[1]}
+  ${recipe.ingredients[2]}
+  ${recipe.ingredients[3]}
+  `);

Sprint-2/implement/contains.js

@@ -1,3 +1,13 @@
-function contains() {}
+function contains(inPut, content) {
+  try {
+    console.log(inPut.hasOwnProperty(content));
+    return inPut.hasOwnProperty(content);
+  } catch (error) {
+    console.error(error);
+  }
+}
+console.log(contains({ a: 1, b: 2 }, "a"));
+console.log(contains({}, 9));
+// console.log(contains([a, 1, b, 2], "a"));
 
 module.exports = contains;

Sprint-2/implement/contains.test.js

@@ -20,16 +20,49 @@ as the object doesn't contains a key of 'c'
 // Given an empty object
 // When passed to contains
 // Then it should return false
-test.todo("contains on empty object returns false");
+test("contains on empty object returns false", () => {
+  expect(contains({}, "c")).toEqual(false);
+});
 
 // Given an object with properties
 // When passed to contains with an existing property name
 // Then it should return true
+test("contains correct object returns true", () => {
+  expect(contains({ a: 4, b: 3, c: 9 }, "c")).toEqual(true);
+  expect(contains({ a: 4, b: 3, c: 9 }, "a")).toEqual(true);
+  expect(
+    contains(
+      { ant: "in your pants", bee: "in your bonnet", cats: "pajamas" },
+      "bee"
+    )
+  ).toEqual(true);
+  expect(contains({ aa: "cars", ba: "baracus", cdeez: "nope" }, "ba")).toEqual(
+    true
+  );
+});
 
 // Given an object with properties
 // When passed to contains with a non-existent property name
 // Then it should return false
+test("contains incorrect object returns false", () => {
+  expect(contains({ a: 4, b: 3, c: 9 }, "d")).toEqual(false);
+  expect(contains({ a: 4, b: 3, c: 9 }, "8")).toEqual(false);
+  expect(
+    contains(
+      { ant: "in your pants", bee: "in your bonnet", cats: "pajamas" },
+      "wasp"
+    )
+  ).toEqual(false);
+  expect(
+    contains({ aa: "cars", ba: "baracus", cdeez: "nope" }, "Hanable Smith")
+  ).toEqual(false);
+});
 
 // Given invalid parameters like an array
 // When passed to contains
 // Then it should return false or throw an error
+test("contains incorrect object type returns false", () => {
+  expect(contains([], "d")).toBe(false);
+  expect(contains("h", "d")).toBe(false);
+  expect(contains(9, "d")).toBe(false);
+});

Sprint-2/implement/lookup.js

@@ -1,5 +1,13 @@
-function createLookup() {
-  // implementation here
+function createLookup(countryAndCurrency) {
+  const money = new Map(countryAndCurrency);
+  const cash = Object.fromEntries(money);
+  console.log(cash);
+  console.log(money);
+  return cash;
 }
+createLookup([
+  ["US", "USD"],
+  ["CA", "CAD"],
+]);
 
 module.exports = createLookup;

Sprint-2/implement/lookup.test.js

@@ -1,6 +1,12 @@
 const createLookup = require("./lookup.js");
-
-test.todo("creates a country currency code lookup for multiple codes");
+test("contains correct object returns true", () => {
+  expect(
+    createLookup([
+      ["US", "USD"],
+      ["CA", "CAD"],
+    ])
+  ).toEqual({ US: "USD", CA: "CAD" });
+});
 
 /*
 

Sprint-2/implement/package.json

@@ -0,0 +1,10 @@
+{
+  "name": "implement",
+  "description": "coureswork",
+  "devDependencies": {
+    "jest": "^30.2.0"
+  },
+  "scripts": {
+    "test": "jest"
+  }
+}

Sprint-2/implement/querystring.js

@@ -12,5 +12,6 @@ function parseQueryString(queryString) {
 
   return queryParams;
 }
-
+console.log(parseQueryString("y=8&r=y"));
+console.log(parseQueryString("equation=x=y+1"));
 module.exports = parseQueryString;

Sprint-2/implement/tally.js

@@ -1,3 +1,20 @@
-function tally() {}
+function tally(arr) {
+  let count = {};
+  for (let letters of arr) {
+    if (count[letters]) {
+      count[letters]++;
+    } else {
+      count[letters] = 1;
+    }
+  }
 
+  console.log(arr);
+  return count;
+}
+
+console.log(tally(["a", "a", "b", "c"]));
 module.exports = tally;
+// let chars = arr.reduce(
+//     (accsess, currentVal, i) => ({ ...arr, [i]: currentVal }),
+//     {}
+//   );

Sprint-2/implement/tally.test.js

@@ -23,7 +23,9 @@ const tally = require("./tally.js");
 // Given an empty array
 // When passed to tally
 // Then it should return an empty object
-test.todo("tally on an empty array returns an empty object");
+test("tally on an empty array returns an empty object", () => {
+  expect(tally(["a", "b", "a"]).toEqual({ a: 2, b: 1 }));
+});
 
 // Given an array with duplicate items
 // When passed to tally

Sprint-2/interpret/invert.js

@@ -6,24 +6,43 @@
 
 // E.g. invert({x : 10, y : 20}), target output: {"10": "x", "20": "y"}
 
-function invert(obj) {
-  const invertedObj = {};
+// function invert(obj) {
+//   const invertedObj = {};
 
-  for (const [key, value] of Object.entries(obj)) {
-    invertedObj.key = value;
-  }
+//   for (const [key, value] of Object.entries(obj)) {
+//     invertedObj.key = value;
+//   }
 
-  return invertedObj;
-}
+//   return invertedObj;
+// }
+// console.log(invert({ a: 1, b: 2 }));
 
 // a) What is the current return value when invert is called with { a : 1 }
+// it only returns { key: 1 }.
 
 // b) What is the current return value when invert is called with { a: 1, b: 2 }
+// it only returns 2 because the loop continues and rewrights the key
 
 // c) What is the target return value when invert is called with {a : 1, b: 2}
+// it should return { "1": "a", "2": "b" }
+
+// d) What does Object.entries return? Why is it needed in this program
+// Object.entries returns the key, value pairs for the object it is given.
+
+// e) Explain why the current return value is different from the target output
+// The invertedObj.key = value; is using the literal string "key" as its key instead of the variable key
 
-// c) What does Object.entries return? Why is it needed in this program?
+// f) Fix the implementation of invert (and write tests to prove it's fixed!)
 
-// d) Explain why the current return value is different from the target output
+function invert(obj) {
+  const invertedObj = {};
+
+  for (const [key, value] of Object.entries(obj)) {
+    invertedObj[value] = key;
+  }
+
+  return invertedObj;
+}
+console.log(invert({ a: 1, b: 2 }));
 
-// e) Fix the implementation of invert (and write tests to prove it's fixed!)
+module.exports = invert;

Sprint-2/interpret/invert.test.js

@@ -0,0 +1,5 @@
+const invert = require("../interpret/invert.js");
+
+test("test for a number followed by a letter", () => {
+  expect(invert({ 1: "a", 2: "b", 3: "c" })).toEqual({ a: 1, b: 2, c: 3 });
+});