Brussels | ITP-2025-1 | Daniela Fajardo | Sprint 1 | fix & implement

Sprint-1/fix/median.js

@@ -6,9 +6,28 @@
 // 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 nums = list.filter(i => typeof i === "number" && !isNaN(i));
+
+  if (nums.length === 0) {
+    return null;
+  }
+
+  const sorted = [...nums].sort((a, b) => a - b);
+
+  const len = sorted.length;
+  const mid = Math.floor(len / 2);
+
+
+  if (len % 2 === 1) {
+    return sorted[mid];
+  }
+
+  return (sorted[mid - 1] + sorted[mid]) / 2;
 }
 
 module.exports = calculateMedian;

Sprint-1/implement/dedupe.js

@@ -1 +1,9 @@
-function dedupe() {}
+function dedupe(arr) {
+    return [...new Set (arr)];
+}
+console.log(dedupe([1, 2, 3]));
+console.log(dedupe([1, 1, 2, 3, 2, 3, 3]));
+console.log(dedupe([]));
+console.log(dedupe(["hello", undefined, 5, 5, "hello"]));
+
+module.exports = dedupe;

Sprint-1/implement/dedupe.test.js

@@ -16,12 +16,20 @@ 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([1, 2, 3])).toEqual([1, 2, 3]);
+});
 
 // 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
+// Then it should remove the duplicate values, preserving the first occurrence of each element
+test("Given an array with strings or numbers, remove the duplicate values, preserving the first occurrence of each element", () => {
+    expect(dedupe(["hello", undefined, 5, 5, "hello"])).toEqual(["hello", undefined, 5,]);
+});

Sprint-1/implement/max.js

@@ -1,4 +1,18 @@
 function findMax(elements) {
-}
+    const arr = elements.filter(i => typeof i === "number" && !isNaN(i));
+
+    if (arr.length === 0) {
+        return -Infinity;
+    }
+
+    let max = arr[0];
 
+    for (const num of arr) {
+        if (num > max) {
+            max = num;
+        }
+    }
+
+    return max;
+}
 module.exports = findMax;

Sprint-1/implement/max.test.js

@@ -16,28 +16,44 @@ 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([])).toBe(-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([50])).toBe(50);
+})
 // 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 positive and negative numbers; returns largest overall", () => {
+    expect(findMax([-1, -3, 5, 7, 8])).toBe(8);
+});
 // 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 negative numbers, returns closest to zero", () => {
+    expect(findMax([-7, -5, -2])).toBe(-2);
+});
 // 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([2.34, 2.35])).toBe(2.35);
+});
 // 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-numbers, returns the max and ignore non-numeric values", () => {
+    expect(findMax(["hello", 2, 5, -1])).toBe(5);
+});
 // 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-numbers values, returns the largest surprising ", () => {
+    expect(findMax(["5", "hello", "a2"])).toBe(-Infinity);
+});

Sprint-1/implement/sum.js

@@ -1,4 +1,19 @@
-function sum(elements) {
+function sum(elements) {   
+    const numbers = elements.filter((i) => typeof i === "number" && !isNaN(i));
+
+        if (numbers.length === 0) {
+          return 0;
+        }
+
+    return numbers.reduce((total, num) => total + num, 0);
 }
 
+console.log(sum([10, 30, 45]));
+console.log(sum([10]));
+console.log(sum([-10, -30, -45]));
+console.log(sum([]));
+console.log(sum([10.5, 30, 45]));
+console.log(sum([NaN, null, 45, 10]));
+console.log(sum([NaN, null, "hello"]));
+
 module.exports = sum;

Sprint-1/implement/sum.test.js

@@ -13,24 +13,37 @@ 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([])).toBe(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, 20, 35])).toBe(65);
+});
 // 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, -30, -45])).toBe(-85);
+});
 // 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([10.5, 30, 45])).toBe(85.5);
+});
 // 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, ignore the non-numerical values and return the sum of the numerical elements", () => {
+  expect(sum([NaN, null, 45, 10])).toBe(55);
+});
 // 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 the least surprising value", () => {
+  expect(sum([NaN, null, "hello"])).toBe(0);
+});