submit week3 assignment

.test-summary/TEST_SUMMARY.md

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+## Test Summary
+
+**Mentors**: For more information on how to review homework assignments, please refer to the [Review Guide](https://github.com/HackYourFuture/mentors/blob/main/assignment-support/review-guide.md).
+
+### 1-JavaScript - Week3
+
+|          Exercise          | Passed | Failed | ESLint |
+|----------------------------|--------|--------|--------|
+| ex1-doubleEvenNumbers.test |   1    |   -    |   ✓    |
+| ex4-observable             |   3    |   -    |   ✓    |

1-JavaScript/Week3/assignment/ex1-doubleEvenNumbers.js

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+function doubleEvenNumbers(numbers) {
+  // TODO rewrite the function body using `map` and `filter`.
+  return numbers.filter(n => n % 2 === 0).map(n => n * 2);
+}
+module.exports = doubleEvenNumbers;
+// ! Unit test (using Jest)
+describe('js-wk3-ex1-doubleEvenNumbers', () => {
+  test('doubleEvenNumbers should take the even numbers and double them', () => {
+    const actual = doubleEvenNumbers([1, 2, 3, 4]);
+    const expected = [4, 8];
+    expect(actual).toEqual(expected);
+  });
+});

1-JavaScript/Week3/assignment/ex1-doubleEvenNumbers.test.js

@@ -12,13 +12,7 @@ Let's rewrite it (or _refactor_ it, as experienced developers would call it):
 // ! Function to be tested
 function doubleEvenNumbers(numbers) {
   // TODO rewrite the function body using `map` and `filter`.
-  const newNumbers = [];
-  for (let i = 0; i < numbers.length; i++) {
-    if (numbers[i] % 2 === 0) {
-      newNumbers.push(numbers[i] * 2);
-    }
-  }
-  return newNumbers;
+  return numbers.filter(n => n % 2 === 0).map(n => n * 2);
 }
 
 // ! Unit test (using Jest)

1-JavaScript/Week3/assignment/ex2-mondaysWorth.js

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+const eurosFormatter = new Intl.NumberFormat('nl-NL', {
+  style: 'currency',
+  currency: 'EUR',
+});
+
+/**
+ * @param {Array<{duration:number}>} tasks
+ * @param {number} hourlyRate
+ * @returns {string}
+ */
+function computeEarnings(tasks, hourlyRate) {
+  const totalMinutes = Array.isArray(tasks)
+    ? tasks.reduce((sum, t) => sum + (Number(t?.duration) || 0), 0)
+    : 0;
+
+  const totalHours = totalMinutes / 60;
+  const earnings = totalHours * Number(hourlyRate || 0);
+
+  return eurosFormatter.format(earnings);
+}
+
+module.exports = computeEarnings;
+

1-JavaScript/Week3/assignment/ex3-lemonAllergy.js

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+const sanitizeFruitBasket = require('./ex3-lemonAllergy');
+
+describe('js-wk3-ex3-lemonAllergy', () => {
+  const fruitBasket = ['apple', 'banana', 'lemon', 'pear'];
+  const originalFruitBasketContents = [...fruitBasket];
+
+  test('sanitizeFruitBasket should take two parameters', () => {
+    expect(sanitizeFruitBasket.length === 2).toBe(true);
+  });
+
+  test('sanitizeFruitBasket should not modify the original fruitBasket array', () => {
+    sanitizeFruitBasket(fruitBasket, 'lemon');
+    const sameContent =
+      fruitBasket.length === originalFruitBasketContents.length &&
+      fruitBasket.every((x, i) => x === originalFruitBasketContents[i]);
+    expect(sameContent).toBe(true);
+  });
+
+  test('sanitizeFruitBasket should return a new array that does not include the unwanted "lemon"', () => {
+    const result = sanitizeFruitBasket(fruitBasket, 'lemon');
+    const hasNoLemon = !result
+      .map(x => String(x).toLowerCase().trim())
+      .includes('lemon');
+    expect(hasNoLemon).toBe(true);
+  });
+});
+
+
+
+
+
+
+
+
+
+

1-JavaScript/Week3/assignment/ex4-observable.js

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+function createObservable() {
+  const subscribers = new Set();
+
+  function subscribe(listener) {
+    if (typeof listener !== "function") {
+      return { unsubscribe() {} };
+    }
+    subscribers.add(listener);
+
+    return {
+      unsubscribe() {
+        subscribers.delete(listener);
+      },
+    };
+  }
+
+  function notify(message) {
+    // snapshot not needed with Set iteration, but this is fine
+    subscribers.forEach((fn) => fn(message));
+  }
+
+  return { subscribe, notify };
+}
+
+module.exports = createObservable;
+function createObservable() {
+  const subscribers = [];
+
+  function subscribe(listener) {
+    subscribers.push(listener);
+    return {
+      unsubscribe() {
+        const index = subscribers.indexOf(listener);
+        if (index !== -1) {
+          subscribers.splice(index, 1);
+        }
+      },
+    };
+  }
+
+  function notify(message) {
+    for (const listener of subscribers) {
+      listener(message);
+    }
+  }
+
+  return { subscribe, notify };
+}
+
+module.exports = createObservable;

1-JavaScript/Week3/assignment/ex4-observable/ex4-observable.js

@@ -1,25 +1,18 @@
-/*------------------------------------------------------------------------------
-Full description at: https://github.com/HackYourFuture/Assignments/tree/main/1-JavaScript/Week4#exercise-4-observable
-
-Complete the `createObservable()` function as follows:
+function createObservable() {
+  const subscribers = [];
 
-- The `subscribe` function should take the function passed to it as an argument
-   and push it onto the `subscribers` array. (Yes, you can store functions in an
-   array. Functions are treated in JavaScript like any other value.
+  function subscribe(listener) {
+    subscribers.push(listener);
+  }
 
-- The `notify` function should iterate through, and call, all subscribers from 
-  the `subscribers` array, passing on the notification message to each 
-  subscriber.
-------------------------------------------------------------------------------*/
+  function notify(message) {
+    subscribers.forEach(listener => listener(message));
+  }
 
-export function createObservable() {
-  const subscribers = [];
   return {
-    subscribe(subscriber) {
-      // TODO complete this function
-    },
-    notify(message) {
-      // TODO complete this function
-    },
+    subscribe,
+    notify
   };
 }
+
+module.exports = { createObservable };

1-JavaScript/Week3/assignment/ex5-wallet.js

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+const eurosFormatter = new Intl.NumberFormat('nl-NL', {
+  style: 'currency',
+  currency: 'EUR',
+});
+
+function createWallet(name, cash = 0) {
+  function deposit(amount) {
+    cash += amount;
+  }
+
+  function withdraw(amount) {
+    if (cash - amount < 0) {
+      console.log(`Insufficient funds!`);
+      return 0;
+    }
+
+    cash -= amount;
+    return amount;
+  }
+
+  function transferInto(wallet, amount) {
+    console.log(
+      `Transferring ${eurosFormatter.format(amount)} from ${name} to ${wallet.getName()}`
+    );
+    const withdrawnAmount = withdraw(amount);
+    wallet.deposit(withdrawnAmount);
+  }
+
+  function reportBalance() {
+    console.log(`Name: ${name}, balance: ${eurosFormatter.format(cash)}`);
+  }
+
+  const getName = () => name;
+
+  return {
+    deposit,
+    withdraw,
+    transferInto,
+    reportBalance,
+    getName,
+  };
+}
+
+const walletJack = createWallet('Jack', 100);
+const walletJoe = createWallet('Joe', 10);
+const walletJane = createWallet('Jane', 20);
+
+walletJack.transferInto(walletJoe, 50);
+walletJane.transferInto(walletJoe, 25);
+
+walletJane.deposit(20);
+walletJane.transferInto(walletJoe, 25);
+
+walletJack.reportBalance();
+walletJoe.reportBalance();
+walletJane.reportBalance();
+
+// * End of exercise code
+
+/*******************************************************************************/
+
+// prettier-ignore
+// eslint-disable-next-line no-unused-vars
+const quiz = {
+  q1: { answer: 'b' },
+  q2: { answer: 'c' },
+  q3: { answer: 'a' },
+  q4: { answer: 'b' },
+  q5: { answer: 'c' },
+};

1-JavaScript/Week3/test-reports/ex1-doubleEvenNumbers.test.report.txt

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+*** Unit Test Error Report ***
+
+ PASS  1-JavaScript/Week3/assignment/ex1-doubleEvenNumbers.test.js
+  js-wk3-ex1-doubleEvenNumbers
+    ✅ doubleEvenNumbers should take the even numbers and double them (3 ms)
+
+Test Suites: 1 passed, 1 total
+Tests:       1 passed, 1 total
+Snapshots:   0 total
+Time:        0.635 s, estimated 1 s
+Ran all test suites matching /C:\\Users\\Rimha\\Assignments-Cohort54\\1-JavaScript\\Week3\\assignment\\ex1-doubleEvenNumbers.test.js/i.
+No linting errors detected.
+No spelling errors detected.

1-JavaScript/Week3/test-reports/ex4-observable.report.txt

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+*** Unit Test Error Report ***
+
+ PASS  1-JavaScript/Week3/assignment/ex4-observable/ex4-observable.test.js
+  js-wk3-ex4-observable
+    ✅ createObservable should exist and be a function (2 ms)
+    ✅ createObservable should return an object with `subscribe` and a `notify` function properties (1 ms)
+    ✅ observable should notify all subscribers of any notification (1 ms)
+
+Test Suites: 1 passed, 1 total
+Tests:       3 passed, 3 total
+Snapshots:   0 total
+Time:        0.627 s, estimated 1 s
+Ran all test suites matching /C:\\Users\\Rimha\\Assignments-Cohort54\\1-JavaScript\\Week3\\assignment\\ex4-observable\\ex4-observable.test.js/i.
+No linting errors detected.
+No spelling errors detected.