Birmingham | 26-ITP-May | Tobias Amaechina | Sprint 1 | Group data sprint 1

Sprint-1/fix/median.js

@@ -6,9 +6,37 @@
 // 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;
+  // validate that  the datetype is arrays
+  if (!Array.isArray(list)) {
+    return null;
+  }
+  // Convert numeric strings to numbers and ignore non-numeric values
+  const numericValue = list
+  .map(item=>{
+    // convert numerical string to number
+    if(typeof item ==="string" && item.trim()!==""&& !isNaN(item)){
+      return Number(item);
+  }
+  return item;
+  } )
+  // Filter every arrays that  is now a number
+  .filter(item =>typeof item==="number"&& !isNaN(item));
+  // Validates if the Arrays has any numerical values at all
+  if (numericValue.length===0){
+    return null;
+  }
+  // sorting the numeric data in ascending order
+  numericValue.sort((a,b)=>a-b);
+  const median = Math.floor(numericValue.length / 2);
+
+  //Add statement to handle when array length is an odd number
+  if (numericValue.length % 2 !==0){
+    return numericValue[median];
+  }
+  // add a logic to handle when the data length is even  number
+  if (numericValue.length % 2 === 0){
+    return (numericValue[median-1] + numericValue[median])/2
+  }
 }
 
 module.exports = calculateMedian;

Sprint-1/implement/dedupe.js

@@ -1 +1,8 @@
-function dedupe() {}
+function dedupe() {
+    const unique = [...new Set(n)];
+    return unique;
+}
+
+
+
+module.exports = dedupe;

Sprint-1/implement/dedupe.test.js

@@ -16,13 +16,43 @@ E.g. dedupe([1, 2, 1]) returns [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");
+const dedupe = require("./dedupe.js");
+
+describe("dedupe given an empty array, it returns an empty array ", () => {
+  [{ input: [], expected: [] }].forEach(({ input, expected }) =>
+    it(`returns the empty array for [${input}]`, () =>
+      expect(dedupe(input)).toEqual(expected))
+  );
+});
 
 // Given an array with no duplicates
 // When passed to the dedupe function
 // Then it should return a copy of the original array
 
+describe("dedupe given an array with no duplicate, it returns a copy of original array ", () => {
+  [{ input: [1, 2, 3], expected: [1, 2, 3] }].forEach(({ input, expected }) =>
+    it(`returns the original copy of the  array for [${input}]`, () =>
+      expect(dedupe(input)).toEqual(expected))
+  );
+});
+
+
+
 // Given an array of strings or numbers
 // When passed to the dedupe function
 // Then it should return a new array with duplicates removed while preserving the 
 // first occurrence of each element from the original array.
+
+describe("dedupe given an array of strings or Numbers , it returns a copy with duplicates in original array removed ", () => {
+  [
+    {
+      input: ["s", "t", "r", "i", "n", "g", "s"],
+      expected: ["s", "t", "r", "i", "n", "g"],
+    },
+    { input: [1, 1, 2, 3, 3, 4], expected: [1,2,3,4] },
+  ].forEach(({ input, expected }) =>
+    it(`returns the original copy of the  array for [${input}]`, () =>
+      expect(dedupe(input)).toEqual(expected))
+  );
+});

Sprint-1/implement/max.js

@@ -1,4 +1,12 @@
 function findMax(elements) {
+    // filter out the numeric numbers 
+const numbers = elements.filter(
+  (item) => typeof item === "number" && !Number.isNaN(item)
+);
+
+const maxiNum = Math.max(...numbers);
+return maxiNum;
+
 }
 
 module.exports = findMax;

Sprint-1/implement/max.test.js

@@ -16,28 +16,49 @@ 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("case 1: Given an empty array when passed to a function should return -Infinity ", () => {
+  expect(findMax([])).toBe(-Infinity );
+});
 
 // Given an array with one number
 // When passed to the max function
 // Then it should return that number
+test("case 2: Given an  array with one number when passed to a function should return that number ", () => {
+  expect(findMax([6])).toBe(6);
+});
 
 // Given an array with both positive and negative numbers
 // When passed to the max function
 // Then it should return the largest number overall
+test("case 3: Given an array with both positive and negative numbers when passed to a function should return the largest number overall ", () => {
+  expect(findMax([-1,-2,-6,6,8,10])).toBe(10);
+});
 
 // Given an array with just negative numbers
 // When passed to the max function
 // Then it should return the closest one to zero
+test("case 4: Given an array with just negative numbers when passed to a function should return the closest number to zero", () => {
+  expect(findMax([-1, -2, -6, -10, -8, -12])).toBe(-1);
+});
 
 // Given an array with decimal numbers
 // When passed to the max function
 // Then it should return the largest decimal number
+test("case 5: Given an array with decimal numbers when passed to a function should return largest decimal number", () => {
+  expect(findMax([1.1, 0.2, 0.3, 0.4, 0.5, 0.6,2.75])).toBe(2.75);
+});
 
 // 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("case 6: Given an array with numeric and non-numeric values it returns the max and ignores non-numeric values", () => {
+  expect(findMax([1.1, 3, 4, "Toby", "undefine", "", 2.75])).toBe(4);
+});
+
 
 // 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, it returns -Infinity", () => {
+  expect(findMax(["Toby", "Sam", null, undefined, ""])).toBe(-Infinity);
+});

Sprint-1/implement/sum.js

@@ -1,4 +1,8 @@
 function sum(elements) {
+      const onlyNumbers = elements.filter(elem=>typeof elem==="number"&&!Number.isNaN(elem));
+    const addNum = onlyNumbers.reduce((item,n)=>item +n,0);
+    return Number(addNum.toFixed(10));
 }
 
+
 module.exports = sum;

Sprint-1/implement/sum.test.js

@@ -13,24 +13,51 @@ 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,when passed to the sun function it 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("Test case 2: given an array with just one number ,when passed to the sun function it returns that  number", () => {
+  expect(sum([5])).toBe(5);
+});
 
 // Given an array containing negative numbers
 // When passed to the sum function
 // Then it should still return the correct total sum
+test("Test case 3: given an array containing negative number ,when passed to the sun function it returns the correct total sum ", () => {
+  expect(sum([-5,-3,-8])).toBe(-16);
+});
 
 // Given an array with decimal/float numbers
 // When passed to the sum function
 // Then it should return the correct total sum
+describe("Test case 4: given an array containing decimal/float numbers ,when passed to the sun function it returns the correct total sum ", () => {
+    [
+      { input: [1.1, 2.2, 3.3], expected: 6.6 },
+      { input: [-1.1, -2.2, -3.3], expected: -6.6 },
+    ].forEach(({ input, expected }) => it(`returns the correct total sum for [${input}]`,()=>{
+      expect(sum(input)).toBeCloseTo(expected);
+
+    }));
+
+});
+
 
 // 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("Test case 5: given an array containing both numeric and non-numeric  values ,when passed to the sun function it returns the  sum of the numeric elements and ignore the non-numerical value  ", () => {
+  expect(sum(["Toby", 6, "undefine","NaN",10, 11])).toBe(27);
+});
+
 // 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,when passed to the sun function it returns 0 which is the least surprising value given how it behaves for all other inputs", () => {
+  expect(sum(["Toby", "undefine", "NaN"])).toBe(0);
+});