Glasgow | 25-ITP-SEP | Mohammed Abdoon | Sprint 1| Sprint-1

Sprint-1/fix/median.js

@@ -5,10 +5,36 @@
 // Hint: Please consider scenarios when 'list' doesn't have numbers (the function is expected to return null)
 // 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;
+function calculateMedian(list) { 
+  let newList = 0;
+
+  // validate input
+  if (list === null || !Array.isArray(list) || !list[0])
+    return null;
+
+  // filter out non-numeric values inside the list
+  list = list.filter(item => Number.isInteger(item));
+
+  // to avoid dealing with empty arrays
+  if (list.length === 0)
+    return null;
+
+  // sort the list
+  list.sort((a, b) => a - b);
+
+  if ( list.length % 2 == 0 ) { // even
+    // return the sum of the two middle numbers divided by 2
+    const middleIndex = list.length / 2;
+    newList = list[middleIndex - 1] + list[middleIndex];
+    newList = newList / 2;
+    return newList;
+  } // else will be odd
+
+  // just return the middle number
+  newList = list[Math.floor(list.length / 2)];
+
+  return newList;
 }
 
+console.log(calculateMedian(["apple", null, undefined]));
 module.exports = calculateMedian;

Sprint-1/implement/dedupe.js

@@ -1 +1,7 @@
-function dedupe() {}
+function dedupe(arr) {
+    arr = new Set(arr); // Using `new Set()` to store only unique values in the same variable
+    return Array.from(arr); // return the new array using `Array.from()`
+}
+
+console.log(dedupe(['a','V','a','b','b','c'])); // ['a','b','c']
+module.exports = dedupe;

Sprint-1/implement/dedupe.test.js

@@ -16,12 +16,28 @@ 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.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.todo("given an empty with no duplicates, it returns 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]);
+    expect(dedupe(['a', 'b', 'c'])).toEqual(['a', 'b', 'c']);
+    expect(dedupe(['H', 'E', 'L', 'O', '2', '0'])).toEqual(['H', 'E', 'L', 'O', '2', '0']);
+    expect(dedupe([5])).toEqual([5]);
+});
 // 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.todo("given an array with strings or numbers, it should remove duplicate values, preserving the first occurence of each element");
+test("given an array with strings or numbers, it should remove duplicate values, preserving the first occurence of each element", () => {
+    expect(dedupe(['a', 'V', 'a', 'b', 'b', 'c'])).toEqual(['a', 'V', 'b', 'c']);
+    expect(dedupe(['x', 'y', 'x', 'z', 'y', 'x'])).toEqual(['x', 'y', 'z']);
+    expect(dedupe([5, 1, 1, 2, 3, 2, 5, 8])).toEqual([5, 1, 2, 3, 8]);
+    expect(dedupe([1, 2, 1])).toEqual([1, 2]);
+});

Sprint-1/implement/max.js

@@ -1,4 +1,13 @@
 function findMax(elements) {
+    let max = -Infinity; // smallest possible value in JS
+    for (const element of elements) {
+        // Check if the element is a finite number and greater than current max
+        if (Number.isFinite(element) && element > max) {
+            max = element; // will always be the greatest so far
+        }
+    }
+    return max;
 }
 
+//console.log(findMax([1.5, 2.3, 0.7, 3.9, 2.8])); // should return 3.9
 module.exports = findMax;

Sprint-1/implement/max.test.js

@@ -17,27 +17,65 @@ const findMax = require("./max.js");
 // 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.todo("given an array with one number, returns that number");
+test("given an array with one number, returns that number", () => {
+    expect(findMax([7842])).toBe(7842);
+    expect(findMax([337])).toBe(337);
+    expect(findMax([1])).toBe(1);
+});
 
 // Given an array with both positive and negative numbers
 // When passed to the max function
 // Then it should return the largest number overall
+test.todo("given an array with both positive and negative numbers, returns the largest number overall");
+test("given an array with both positive and negative numbers, returns the largest number overall", () => {
+    expect(findMax([-10, 0, 5, -3, 8, 2])).toBe(8);
+    expect(findMax([-20, -5, -1, -15])).toBe(-1);
+    expect(findMax([3, 7, 2, 9, 4])).toBe(9);
+});
 
 // Given an array with just negative numbers
 // When passed to the max function
 // Then it should return the closest one to zero
+test.todo("given an array with just negative numbers, returns the closest one to zero");
+test("given an array with just negative numbers, returns the closest one to zero", () => {
+    expect(findMax([-8, -3, -15, -1, -7])).toBe(-1);
+    expect(findMax([-50, -20, -30, -10])).toBe(-10);
+});
 
 // Given an array with decimal numbers
 // When passed to the max function
 // Then it should return the largest decimal number
+test.todo("given an array with decimal numbers, returns the largest decimal number");
+test("given an array with decimal numbers, returns the largest decimal number", () => {
+    expect(findMax([1.5, 2.3, 0.7, 3.9, 2.8])).toBe(3.9);
+    expect(findMax([-1.2, -0.5, -3.4, -0.1])).toBe(-0.1);
+    expect(findMax([0.1, 0.01, 0.001, 0.0001])).toBe(0.1);
+});
 
 // 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.todo("given an array with non-number values, returns the max and ignores non-numeric values");
+test("given an array with non-number values, returns the max and ignores non-numeric values", () => {
+    expect(findMax([10, 'hello', 25, null, 15])).toBe(25);
+    expect(findMax(['world', -5, -10, undefined, -2])).toBe(-2);
+    expect(findMax([3.5, 'test', 4.2, {}, 2.8])).toBe(4.2);
+});
 
 // 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.todo("given an array with only non-number values, returns -Infinity");
+test("given an array with only non-number values, returns -Infinity", () => {
+    expect(findMax(['a', 'b', 'c'])).toBe(-Infinity);
+    expect(findMax([null, undefined, {}])).toBe(-Infinity);
+    expect(findMax([true, false, []])).toBe(-Infinity);
+});

Sprint-1/implement/sum.js

@@ -1,4 +1,14 @@
 function sum(elements) {
+    let sum = 0;
+
+    for ( const element of elements) {
+        if (Number.isFinite(element)) {
+        sum += element;
+        }
+    }
+
+    return sum;
 }
 
+console.log(sum([0.5, 2.5, 3.5]));
 module.exports = sum;

Sprint-1/implement/sum.test.js

@@ -13,24 +13,56 @@ 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.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.todo("Given an array with just one number, return that number");
+test(     "Given an array with just one number, return that number", () => {
+    expect(sum([4] )).toEqual(4 );
+    expect(sum([99])).toEqual(99);
+    expect(sum([81])).toEqual(81);
+});
 
 // Given an array containing negative numbers
 // When passed to the sum function
 // Then it should still return the correct total sum
+test.todo("Given an array containing negative numbers, return the correct total sum");
+test(     "Given an array containing negative numbers, return the correct total sum", () => {
+    expect(sum([-81, -4, 44, -12])).toEqual(-53);
+    expect(sum([-10, 20, -30, 40])).toEqual(20);
+    expect(sum([-5, -15, -10])).toEqual(-30);
+});
 
 // Given an array with decimal/float numbers
 // When passed to the sum function
 // Then it should return the correct total sum
+test.todo("Given an array with decimal/float numbers, return the correct total sum");
+test(     "Given an array with decimal/float numbers, return the correct total sum", () => {
+    expect(sum([0.5, 2.5, 3.5])).toEqual(6.5);
+    expect(sum([1.1, 2.2, 3.3])).toEqual(6.6);
+    expect(sum([10.5, 20.25, 30.75])).toEqual(61.5);
+});
 
 // 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.todo("Given an array containing non-number values, ignore them and return the sum of the numerical elements");
+test(     "Given an array containing non-number values, ignore them and return the sum of the numerical elements", () => {
+    expect(sum(['hey', 10, 'hi', 60, 10])).toEqual(80);
+    expect(sum([null, 5, undefined, 15, 'test'])).toEqual(20);
+    expect(sum([true, 20, false, 30, 'hello'])).toEqual(50);
+});
 // 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.todo("Given an array with only non-number values, returns 0");
+test(     "Given an array with only non-number values, returns 0", () => {
+    expect(sum(['a', 'b', 'c'])).toEqual(0);
+    expect(sum([null, undefined, 'test'])).toEqual(0);
+    expect(sum([true, false, 'hello'])).toEqual(0);
+});

Sprint-1/refactor/includes.js

@@ -1,13 +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;
-    }
-  }
-  return false;
+const includes = (list, target) =>{
+  for (item of list)
+      if ( item == target ) return true;
+  return false; 
 }
 
 module.exports = includes;