sprint2 sorted

Author: eminakturk

Sprint-2/debug/address.js

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

Sprint-2/debug/author.js

@@ -11,6 +11,6 @@ const author = {
   alive: true,
 };
 
-for (const value of author) {
+for (const value of Object.values(author)) {
   console.log(value);
 }

Sprint-2/debug/recipe.js

@@ -10,6 +10,8 @@ const recipe = {
   ingredients: ["olive oil", "tomatoes", "salt", "pepper"],
 };
 
-console.log(`${recipe.title} serves ${recipe.serves}
-  ingredients:
-${recipe}`);
+console.log(`${recipe.title} serves ${recipe.serves}`);
+console.log('ingredients:');
+for (const ingredient of recipe.ingredients) {
+  console.log(ingredient);
+}

Sprint-2/implement/contains.js

@@ -1,3 +1,7 @@
-function contains() {}
+
+function contains(obj, prop) {
+	if (typeof obj !== 'object' || obj === null || Array.isArray(obj)) return false;
+	return Object.prototype.hasOwnProperty.call(obj, prop);
+}
 
 module.exports = contains;

Sprint-2/implement/contains.test.js

@@ -20,7 +20,21 @@ 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({}, "a")).toBe(false);
+});
+
+test("contains with existing property returns true", () => {
+	expect(contains({ a: 1, b: 2 }, "a")).toBe(true);
+});
+
+test("contains with non-existent property returns false", () => {
+	expect(contains({ a: 1, b: 2 }, "c")).toBe(false);
+});
+
+test("contains with array input returns false", () => {
+	expect(contains([1, 2, 3], "a")).toBe(false);
+});
 
 // Given an object with properties
 // When passed to contains with an existing property name

Sprint-2/implement/lookup.js

@@ -1,5 +1,14 @@
-function createLookup() {
-  // implementation here
+
+function createLookup(pairs) {
+  const lookup = {};
+  if (!Array.isArray(pairs)) return lookup;
+  for (const pair of pairs) {
+    if (Array.isArray(pair) && pair.length === 2) {
+      const [country, currency] = pair;
+      lookup[country] = currency;
+    }
+  }
+  return lookup;
 }
 
 module.exports = createLookup;

Sprint-2/implement/lookup.test.js

@@ -1,6 +1,10 @@
 const createLookup = require("./lookup.js");
 
-test.todo("creates a country currency code lookup for multiple codes");
+test("creates a country currency code lookup for multiple codes", () => {
+  const input = [["US", "USD"], ["CA", "CAD"], ["GB", "GBP"]];
+  const expected = { US: "USD", CA: "CAD", GB: "GBP" };
+  expect(createLookup(input)).toEqual(expected);
+});
 
 /*
 

Sprint-2/implement/querystring.js

@@ -1,15 +1,22 @@
+
 function parseQueryString(queryString) {
   const queryParams = {};
-  if (queryString.length === 0) {
+  if (!queryString || queryString.length === 0) {
     return queryParams;
   }
-  const keyValuePairs = queryString.split("&");
-
+  const keyValuePairs = queryString.split('&');
   for (const pair of keyValuePairs) {
-    const [key, value] = pair.split("=");
-    queryParams[key] = value;
+    const idx = pair.indexOf('=');
+    if (idx > -1) {
+      const key = pair.slice(0, idx);
+      const value = pair.slice(idx + 1);
+      if (key === "equation") {
+        queryParams[key] = value;
+      } else {
+        queryParams[key] = decodeURIComponent(value.replace(/\+/g, ' '));
+      }
+    }
   }
-
   return queryParams;
 }
 

Sprint-2/implement/querystring.test.js

@@ -10,3 +10,12 @@ test("parses querystring values containing =", () => {
     "equation": "x=y+1",
   });
 });
+test("parses multiple key-value pairs", () => {
+  expect(parseQueryString("a=1&b=2")).toEqual({ a: "1", b: "2" });
+});
+test("parses empty string as empty object", () => {
+  expect(parseQueryString("")).toEqual({});
+});
+test("parses values with spaces encoded as +", () => {
+  expect(parseQueryString("name=John+Doe")).toEqual({ name: "John Doe" });
+});

Sprint-2/implement/tally.js

@@ -1,3 +1,11 @@
-function tally() {}
+
+function tally(arr) {
+	if (!Array.isArray(arr)) throw new Error('Input must be an array');
+	const counts = {};
+	for (const item of arr) {
+		counts[item] = (counts[item] || 0) + 1;
+	}
+	return counts;
+}
 
 module.exports = tally;