London | ITP-May-2025 | Sisay Mehari | Module-Data-Groups | Sprint 1

Sprint-1/fix/median.js

@@ -6,9 +6,22 @@
 // or 'list' has mixed values (the function is expected to sort only numbers).
 
 function calculateMedian(list) {
-  const middleIndex = Math.floor(list.length / 2);
-  const median = list.splice(middleIndex, 1)[0];
-  return median;
+  if (!Array.isArray(list)) {
+    return null;
+  }
+  const arrFilter = list.filter (item => typeof item === "number" && !isNaN(item)
+);
+  if (arrFilter.length === 0)
+    return null;
+  const sortedArr = arrFilter.sort((a,b) => a - b);
+  const len = sortedArr.length;
+  const middleIndex = Math.floor(len / 2);
+  if (len % 2 !== 0){
+    return sortedArr[middleIndex];
+  } else{
+    return (sortedArr[middleIndex - 1] + sortedArr[middleIndex]) / 2;
+  }
 }
 
+
 module.exports = calculateMedian;

Sprint-1/fix/median.test.js

@@ -47,4 +47,4 @@ describe("calculateMedian", () => {
   ].forEach(({ input, expected }) =>
     it(`filters out non-numeric values and calculates the median for [${input}]`, () => expect(calculateMedian(input)).toEqual(expected))
   );
-});
+});

Sprint-1/implement/dedupe.js

@@ -1 +1,11 @@
-function dedupe() {}
+function dedupe(list) {
+    const unique = [...new Set(list)];
+    return unique;
+}
+
+// console.log(dedupe(['apple', 'banana', 'apple', 1, 2, 1])); 
+
+
+
+
+module.exports = dedupe;

Sprint-1/implement/dedupe.test.js

@@ -1,4 +1,4 @@
-const dedupe = require("./dedupe.js");
+const dedupe = require("./dedupe");
 /*
 Dedupe Array
 
@@ -16,12 +16,21 @@ E.g. dedupe([1, 2, 1]) target output: [1, 2]
 // Given an empty array
 // When passed to the dedupe function
 // Then it should return an empty array
-test.todo("given an empty array, it returns an empty array");
+test("given an empty array, it returns an empty array", () => {
+    expect(dedupe([])).toEqual([]);
+});
 
 // Given an array with no duplicates
 // When passed to the dedupe function
 // Then it should return a copy of the original array
+test("given an array with no duplicates, it returns a copy of the original array", () => {
+    expect(dedupe([4,9,12])).toEqual([4,9,12]);
+
+});
 
 // Given an array with strings or numbers
 // When passed to the dedupe function
 // Then it should remove the duplicate values, preserving the first occurence of each element
+test("given an array with string or number , it removes duplicate values and preserve the first occurence of the element", ()=> {
+    expect(dedupe(['apple', 'banana', 'apple', 1, 2, 1])).toEqual(['apple', 'banana', 1, 2]);
+});

Sprint-1/implement/max.js

@@ -1,4 +1,10 @@
 function findMax(elements) {
+    const filtered = elements.filter(elements => typeof elements === "number" && !isNaN(elements))
+    const max = Math.max(...filtered);
+    return max;
 }
 
+
+
+console.log(findMax(['apple', 'banana', null, undefined]));
 module.exports = findMax;

Sprint-1/implement/max.test.js

@@ -16,28 +16,51 @@ const findMax = require("./max.js");
 // When passed to the max function
 // Then it should return -Infinity
 // Delete this test.todo and replace it with a test.
-test.todo("given an empty array, returns -Infinity");
+test("given an empty array, returns -Infinity", ()=> {
+    expect(findMax([])).toEqual(-Infinity);
+});
 
 // Given an array with one number
 // When passed to the max function
 // Then it should return that number
+test("given an array with one number, returns that number", () => {
+    expect(findMax([10])).toEqual(10);
+})
+
+
 
 // Given an array with both positive and negative numbers
 // When passed to the max function
 // Then it should return the largest number overall
+test("given an array with both positive and negative numbers, returns the largest number overall", () =>{
+    expect(findMax([1, -2, 3, -4, 5])).toEqual(5);
+})
 
 // Given an array with just negative numbers
 // When passed to the max function
 // Then it should return the closest one to zero
+test("given an array with just negative numbers, returns the closest one to zero", () => {
+    expect(findMax([-1, -2, -3])).toEqual(-1);
+});
 
 // Given an array with decimal numbers
 // When passed to the max function
 // Then it should return the largest decimal number
+test("given an array with decimal numbers, returns the largest decimal number", () => {
+    expect(findMax([1.5, 2.3, 0.7])).toEqual(2.3);
+});
 
 // Given an array with non-number values
 // When passed to the max function
 // Then it should return the max and ignore non-numeric values
+test("given an array with non-number values, returns the max and ignores non-numeric values", () => {
+    expect(findMax([3, 'apple', null, 7, NaN, 5])).toEqual(7);
+});
+
 
 // Given an array with only non-number values
 // When passed to the max function
 // Then it should return the least surprising value given how it behaves for all other inputs
+test("given an array with only non-number values, returns -Infinity", () => {
+    expect(findMax(['apple', 'banana', null, undefined])).toEqual(-Infinity);
+});

Sprint-1/implement/sum.js

@@ -1,4 +1,11 @@
 function sum(elements) {
+    const filtered = elements.filter(elements =>  typeof elements === "number" && !isNaN(elements) );
+    if (filtered.length === 0) {
+        return 0;
+    }else {
+        const sumTotal = filtered.reduce((total, elements) => total + elements, 0);
+        return sumTotal;
+    }
 }
 
 module.exports = sum;

Sprint-1/implement/sum.test.js

@@ -13,24 +13,40 @@ const sum = require("./sum.js");
 // Given an empty array
 // When passed to the sum function
 // Then it should return 0
-test.todo("given an empty array, returns 0")
+test("given an empty array, returns 0", () => {
+  expect(sum([])).toEqual(0);
+});
 
 // Given an array with just one number
 // When passed to the sum function
 // Then it should return that number
+test("given an array with just one number, returns that number", () => {
+  expect(sum([10])).toEqual(10);
+});
 
 // Given an array containing negative numbers
 // When passed to the sum function
 // Then it should still return the correct total sum
+test("given an array containing negative numbers, returns the correct total sum", () => {
+  expect(sum([10, -2, -4])).toEqual(4);
+});
 
 // Given an array with decimal/float numbers
 // When passed to the sum function
 // Then it should return the correct total sum
+test("given an array with decimal/float numbers, returns the correct total sum", () => {
+  expect(sum([0.23, 0.1, 2.3])).toEqual(2.63);
+});
 
 // Given an array containing non-number values
 // When passed to the sum function
 // Then it should ignore the non-numerical values and return the sum of the numerical elements
-
+test("given an array containing non-number values, ignores non-numerical values and returns the sum of numerical elements", () => {
+    expect(sum([3, 'apple', null, 7, NaN, 5])).toEqual(15);
+});
 // Given an array with only non-number values
 // When passed to the sum function
 // Then it should return the least surprising value given how it behaves for all other inputs
+test("given an array with only non-number values, returns 0", () => {
+    expect(sum(['apple', 'banana', null, undefined])).toEqual(0);
+});

Sprint-1/refactor/includes.js

@@ -1,10 +1,9 @@
 // Refactor the implementation of includes to use a for...of loop
 
 function includes(list, target) {
-  for (let index = 0; index < list.length; index++) {
-    const element = list[index];
-    if (element === target) {
-      return true;
+  for (const item of list) {
+    if (item === target) {
+    return true;
     }
   }
   return false;

Sprint-1/stretch/aoc-2018-day1/solution.js

@@ -0,0 +1,17 @@
+const fs = require('fs');
+
+const filePath = 'input.txt';
+try {
+const content = fs.readFileSync(filePath, 'utf8');
+const frequencyChanges = content
+  .split('\n')
+  .filter(line => line.trim() !== '')
+  .map(str => parseInt(str, 10));
+
+
+const total = frequencyChanges.reduce((a, b) => a + b, 0);
+
+console.log('Total frequency:', total);
+}catch (err) {
+  console.error('Error reading file:', err);
+}