London | ITP MAY | Jamal Laqdiem | Module Data Groups | Sprint-2

Sprint-2/debug/address.js

@@ -1,5 +1,5 @@
 // Predict and explain first...
-
+// It will throw an error because we access a value associated with key in properties object by using the dot notation 
 // This code should log out the houseNumber from the address object
 // but it isn't working...
 // Fix anything that isn't working
@@ -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

@@ -1,5 +1,5 @@
 // Predict and explain first...
-
+// it will throw an error because we cannot iterate directly in an object, we need first to make sure that the object become an array to iterate.
 // 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
 
@@ -11,6 +11,7 @@ const author = {
   alive: true,
 };
 
-for (const value of author) {
+const newObject = Object.values(author)
+for (const value of newObject) {
   console.log(value);
 }

Sprint-2/debug/recipe.js

@@ -1,5 +1,6 @@
 // Predict and explain first...
-
+// to log out the title and serves we need to use dot notation to access the property value associated with the key.
+// instead to access ingredients values and print them in different lines, we need to loop over recipe.ingredients.
 // 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?
@@ -8,8 +9,13 @@ const recipe = {
   title: "bruschetta",
   serves: 2,
   ingredients: ["olive oil", "tomatoes", "salt", "pepper"],
+
+
 };
 
 console.log(`${recipe.title} serves ${recipe.serves}
-  ingredients:
-${recipe}`);
+  ingredients:`);
+
+for(ingredient of recipe.ingredients) {
+  console.log(ingredient)
+}

Sprint-2/implement/contains.js

@@ -1,3 +1,24 @@
-function contains() {}
+const containObject = {
+first_name : 'john',
+surname: 'madim',
+date_of_birth : 1986,
+place_of_birth : 'newYork'
+}
+
+function contains(obj,propertyName) {
+        if ( typeof obj !== 'object'|| obj === null || Array.isArray(obj)){
+        throw new Error ('Invalid first argument parameter, need to be an object.')
+    }
+    if (Object.keys(obj).length ===0){
+        return false
+    }
+
+    const keyObject = Object.keys(obj)
+    const hasPropertyName = keyObject.includes(propertyName)
+    return hasPropertyName
+
+}
+
+
 
 module.exports = contains;

Sprint-2/implement/contains.test.js

@@ -12,24 +12,55 @@ as the object doesn't contains a key of 'c'
 */
 
 // Acceptance criteria:
-
+describe('conatains function',() => {
 // Given a contains function
 // When passed an object and a property name
 // Then it should return true if the object contains the property, false otherwise
 
+test('should return true if the object contains the property', () => {
+        const testObject = { a: 1, b: 2 };
+        expect(contains(testObject, 'a')).toBe(true);
+        expect(contains(testObject, 'b')).toBe(true);
+        expect(contains({ surname: 'madin', date_of_birth: 1986 }, 'surname')).toBe(true)
+});
 // Given an empty object
 // When passed to contains
 // Then it should return false
-test.todo("contains on empty object returns false");
+test("should return false when passed an empty object", () => {
+        expect(contains({}, 'surname')).toBe(false);
+        expect(contains({}, 'anyProperty')).toBe(false);
+    });
 
 // Given an object with properties
 // When passed to contains with an existing property name
 // Then it should return true
-
+test('should return true if the object contains the property', () => {
+        const testObject = { a: 1, b: 2 };
+        expect(contains(testObject, 'a')).toBe(true);
+        expect(contains(testObject, 'b')).toBe(true);
+        expect(contains({ first_name: 'john', date_of_birth: 1986 }, 'first_name')).toBe(true)
+});
 // Given an object with properties
 // When passed to contains with a non-existent property name
 // Then it should return false
-
+test('should return false if the object does not contain the property', () => {
+        const testObject = { a: 1, b: 2 };
+        expect(contains(testObject, 'c')).toBe(false);
+        expect(contains(testObject, 'x')).toBe(false);
+        expect(contains({ surname: 'madin', date_of_birth: 1986 }, 'place_of_birth')).toBe(false);
+});
 // Given invalid parameters like an array
 // When passed to contains
 // Then it should return false or throw an error
+
+test('should throw an error for invalid parameters like an array', () => {
+        expect(() => contains([], 'surname')).toThrow('Invalid parameter: The first argument must be a non-null, non-array object.')
+
+        expect(() => contains(null, 'first_name')).toThrow('Invalid parameter: The first argument must be a non-null, non-array object.')
+        expect(() => contains(123, 'first_name')).toThrow('Invalid parameter: The first argument must be a non-null, non-array object.');
+
+        // Test with undefined
+        expect(() => contains(undefined, 'surname')).toThrow('Invalid parameter: The first argument must be a non-null, non-array object.');
+})
+
+});

Sprint-2/implement/lookup.js

@@ -1,5 +1,14 @@
-function createLookup() {
-  // implementation here
+const countryCurrency = [["MAR","MAD"],["UK","GBP"],["US","USD"]]
+
+
+function createLookup(dataCurrency) {
+
+ return dataCurrency.reduce((acc,entry) => {
+  const [countryCode,currencyCode]=entry
+  acc[countryCode]= currencyCode
+  return acc
+ },{})
 }
 
+console.log(createLookup(countryCurrency))
 module.exports = createLookup;

Sprint-2/implement/lookup.test.js

@@ -1,6 +1,19 @@
 const createLookup = require("./lookup.js");
 
-test.todo("creates a country currency code lookup for multiple codes");
+
+describe('createLookup function', () => {
+
+test("creates a country currency code lookup for multiple codes", () =>{
+      const dataCurrency = [['MAR','MAD'],['US', 'USD'], ['CA', 'CAD']];
+    const result = createLookup(dataCurrency);
+    expect(result).toEqual({
+      'MAR': 'MAD',
+      'US': 'USD',
+      'CA': 'CAD'
+    });
+  });
+
+});
 
 /*
 
@@ -33,3 +46,16 @@ It should return:
    'CA': 'CAD'
  }
 */
+  test("handles an empty array input", () => {
+    const emptyArray = [];
+    const result = createLookup(emptyArray);
+    expect(result).toEqual({});
+  });
+
+    test("handles a single country currency pair", () => {
+    const singlePair = [['JP', 'JPY']];
+    const result = createLookup(singlePair);
+    expect(result).toEqual({
+      'JP': 'JPY'
+    });
+  });

Sprint-2/implement/querystring.js

@@ -6,11 +6,13 @@ function parseQueryString(queryString) {
   const keyValuePairs = queryString.split("&");
 
   for (const pair of keyValuePairs) {
-    const [key, value] = pair.split("=");
+    const [key, value] = pair.split("=",2)
     queryParams[key] = value;
   }
 
   return queryParams;
 }
-
-module.exports = parseQueryString;
+console.log(parseQueryString("equation=x=y+1"))
+console.log(parseQueryString(""))
+console.log(parseQueryString("a=1&&b=2"))
+module.exports = parseQueryString; 

Sprint-2/implement/querystring.test.js

@@ -5,8 +5,40 @@
 
 const parseQueryString = require("./querystring.js")
 
+describe("parseQueryString edge cases", () => {
 test("parses querystring values containing =", () => {
   expect(parseQueryString("equation=x=y+1")).toEqual({
     "equation": "x=y+1",
   });
 });
+
+  test("returns an empty object for an empty query string", () => {
+    expect(parseQueryString("")).toEqual({}); 
+  });
+
+  test("handles keys with no assigned value", () => {
+    expect(parseQueryString("key_no_value")).toEqual({
+      "key_no_value": undefined
+    });
+  });
+
+  test("handles keys with an empty string value (e.g., 'key=')", () => {
+    expect(parseQueryString("key_empty_value=")).toEqual({
+      "key_empty_value": ""
+    });
+  });
+
+  test("handles multiple '&' by returning correct object and no empty keys", () => {
+    expect(parseQueryString("a=1&&b=2")).toEqual({
+      "a": "1",
+      "b": "2"
+    });
+    expect(Object.keys(result)).not.toContain("")
+  });
+
+  test("parses querystring values containing '='", () => {
+    expect(parseQueryString("equation=x=y+1")).toEqual({
+      "equation": "x=y+1",
+    });
+  });
+});

Sprint-2/implement/tally.js

@@ -1,3 +1,18 @@
-function tally() {}
+function tally(arr) {
+    objectResult = {}
+    if(arr.length ===0)
+        return {}
+    if( !Array.isArray(arr)) {
+        throw new Error ('Error parameter must be an array.')
+    }
+for(count  of arr) {
+    objectResult[count]= (objectResult[count] || 0) +1 ;
+}
 
+return objectResult
+}
+
+console.log(tally(['a','b','c','c']))
+console.log(tally([]))
+console.log(tally("Hello"))
 module.exports = tally;

Sprint-2/implement/tally.test.js

@@ -13,22 +13,34 @@ const tally = require("./tally.js");
  * tally(['a', 'a', 'a']), target output: { a: 3 }
  * tally(['a', 'a', 'b', 'c']), target output: { a : 2, b: 1, c: 1 }
  */
+describe('tally function tests', () => {
 
 // Acceptance criteria:
 
 // Given a function called tally
 // When passed an array of items
 // Then it should return an object containing the count for each unique item
-
+test('When passed an array of item, then it should return an object containing the count for each unique item',() =>{
+    expect(tally(['a','o,','h'])).toEqual({a:1, o:1,h:1})
+})
 // 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([])).toEqual({})
+});
 
 // Given an array with duplicate items
 // When passed to tally
 // Then it should return counts for each unique item
-
+test(' Given an array with duplicate item, should return counts for each unique item',() =>{
+    expect(tally(['a','o,','o'])).toEqual({a:1, o:2})
+})
 // Given an invalid input like a string
 // When passed to tally
 // Then it should throw an error
+test('  Given an invalid input like a string, should throw an error',() =>{
+    expect(() => tally('Hello World')).toThrow('Error: Parameter must be an array.')
+
+})
+})

Sprint-2/interpret/invert.js

@@ -6,24 +6,50 @@
 
 // E.g. invert({x : 10, y : 20}), target output: {"10": "x", "20": "y"}
 
+
 function invert(obj) {
   const invertedObj = {};
 
   for (const [key, value] of Object.entries(obj)) {
-    invertedObj.key = value;
+    invertedObj[value] = key;
   }
-
   return invertedObj;
+
 }
+console.log(invert({a:1})) // output {1:a}
+console.log(invert({ a: 1, b: 2 })) // output {1:a,2:b}
+console.log(invert({})) //output {{}}
+console.log(invert({name:'Mike',age:33})) // output {Mike:'name', 33:age}
 
 // a) What is the current return value when invert is called with { a : 1 }
-
+// The return value is {key:1}
 // b) What is the current return value when invert is called with { a: 1, b: 2 }
-
+//The return value is {key:2}
 // c) What is the target return value when invert is called with {a : 1, b: 2}
-
+// The target return value should be {1:a,2:b}
 // c) What does Object.entries return? Why is it needed in this program?
-
+// Object.entries return the keys and values of the object(obj)
 // d) Explain why the current return value is different from the target output
-
+// The difference happen when using the dot notation to access literal string instead of expression, it does not use the value of key variable.
 // e) Fix the implementation of invert (and write tests to prove it's fixed!)
+
+//test 1:
+const result1 = invert({a:1});
+const expected1 = {1:'a'};
+console.log(`Test 1: Input {a:1}, Expected ${JSON.stringify(expected1)}, Actual ${JSON.stringify(result1)}`);
+console.log(`Result: ${JSON.stringify(result1) === JSON.stringify(expected1) ? 'PASS' : 'FAIL'}`);
+//test 2:
+const result2 = invert({ a: 1, b: 2 });
+const expected2 = {1:'a', 2:'b'};
+console.log(`Test 2: Input {a:1, b:2}, Expected ${JSON.stringify(expected2)}, Actual ${JSON.stringify(result2)}`);
+console.log(`Result: ${JSON.stringify(result2) === JSON.stringify(expected2) ? 'PASS' : 'FAIL'}`);
+//test 3:
+const result3 = invert({});
+const expected3 = {};
+console.log(`Test 3: Input {}, Expected ${JSON.stringify(expected3)}, Actual ${JSON.stringify(result3)}`);
+console.log(`Result: ${JSON.stringify(result3) === JSON.stringify(expected3) ? 'PASS' : 'FAIL'}`);
+//test 4:
+const result4 = invert({name:'Mike',age:33});
+const expected4 = {Mike:'name',33:'age'};
+console.log(`Test 4: Input {name:'Mike',age:33}, Expected ${JSON.stringify(expected4)}, Actual ${JSON.stringify(result4)}`);
+console.log(`Result: ${JSON.stringify(result4) === JSON.stringify(expected4) ? 'PASS' : 'FAIL'}`);

Sprint-2/interpret/tempCodeRunnerFile.js

@@ -0,0 +1 @@
+console.log(`Test 1: Input {a:1}, Expected ${JSON.stringify(expected1)}, Actual ${JSON.stringify(result1)}`);