all tasks completed for data groups sprint 1

Author: risikatpopoola

Sprint-1/fix/median.js

@@ -6,9 +6,25 @@
 // 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];
+  if (!Array.isArray(list)) {
+  return null;
+}
+  const list2 = list.filter(item => typeof item === "number").sort( (a,b) => (a - b));
+  if (list2.length === 0) {
+    return null;
+  }
+  if(list2.length % 2 === 1){
+  const middleIndex = Math.floor(list2.length / 2);
+  const median = list2[middleIndex];
+  return median;
+  }
+  if(list2.length % 2 === 0){
+  const middleIndex = Math.floor(list2.length / 2);
+  const median = (list2[middleIndex] + list2[middleIndex - 1]) / 2;
   return median;
+  }
+  
 }
 
+
 module.exports = calculateMedian;

Sprint-1/implement/dedupe.js

@@ -1 +1,12 @@
-function dedupe() {}
+function dedupe(input) {
+const newArray = []
+    if(input.length === 0){
+        return []
+    }
+    for(const i in input)
+        for(const j in input)
+    if (i !== j && !newArray.includes(input[i]))
+        newArray.push(input[i])
+    return newArray;
+}
+module.exports = dedupe;

Sprint-1/implement/dedupe.test.js

@@ -16,13 +16,25 @@ 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(`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 should return the same array`, () => {
+  expect(dedupe(['a','b','c'])).toEqual(['a','b','c']);
+  expect(dedupe(['1','2','3'])).toEqual(['1','2','3']);
+  
+});
 
 // 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.
+test(`given an array with duplicates, it should return the array with duplicates removed preserving the first occurrence`, () => {
+  expect(dedupe(['b','c','a','b','c', 'b','c'])).toEqual(['b','c','a']);
+  expect(dedupe(['1','2','2','3','1','2','3'])).toEqual(['1','2','3']);
+  
+});

Sprint-1/implement/max.js

@@ -1,4 +1,13 @@
 function findMax(elements) {
+    if (elements.length === 0){
+        return -Infinity;
+}
+const cleanElements = elements.filter(item => typeof item === "number").sort( (a,b) => (a - b));
+    if (cleanElements.length === 0){
+        return -Infinity;
+    }
+    else{
+        return cleanElements[cleanElements.length-1]
+    }
 }
-
 module.exports = findMax;

Sprint-1/implement/max.test.js

@@ -16,28 +16,46 @@ 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, it 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, it should return that number`, () => {
+  expect(findMax([80])).toEqual(80);
+  expect(findMax([1])).toEqual(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(`given an array with both positive numbers and negative numbers, it should return the largest number overall`, () => {
+  expect(findMax([80, -30, 50, -10, 20, 100, 40])).toEqual(100);
+  expect(findMax([-90, 30, 250, 1, 120, -100, -40])).toEqual(250);
+});
 // 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, it should return the addition of them all`, () => {
+  expect(findMax([-80, -30, -50, -10, -20, -100, -40])).toEqual(-10);
+});
 // 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, it should return the largest decimal number`, () => {
+  expect(findMax([-80.5, -30.1, 50.7, -10, 20.4, 10.3, 60.1])).toEqual(60.1);
+});
 // 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(`given an array of numeric and non-numeric values, it should return the largest numeric`, () => {
+  expect(findMax(['hey', 10, 'hi', 60, 10])).toEqual(60);
+  expect(findMax(['i', 'love', 10, 'code', 'hi', 80, 60, 'your', 'future', 10])).toEqual(80);
+});
 // 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 of non-numeric values, it should return -Infinity`, () => {
+  expect(findMax(['i', 'love', 'code', 'your', 'future'])).toEqual(-Infinity);
+});

Sprint-1/implement/sum.js

@@ -1,4 +1,18 @@
 function sum(elements) {
+    if (elements.length === 0){
+        return 0;
 }
+const cleanElements = elements.filter(item => typeof item === "number").sort( (a,b) => (a - b));
+let sum = 0 
+if (cleanElements.length === 0){
+        return 0;
+    }
+    else{
+        for(let i = 0; i < cleanElements.length; i++)
+            sum += cleanElements[i] 
+         
+    return sum;
 
+    }
+}
 module.exports = sum;

Sprint-1/implement/sum.test.js

@@ -13,24 +13,39 @@ 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, it returns zero`, () => {
+  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 one number, it should return that number`, () => {
+  expect(sum([80])).toEqual(80);
+  expect(sum([1])).toEqual(1);
+});
 // 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 with negative numbers, it should return the addition of them all`, () => {
+  expect(sum([-80, -30, -50, -10, -20, -100, -40])).toEqual(-330);
+});
 // 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 numbers, it should return the total`, () => {
+  expect(sum([-80.5, -30.1, 50.7, -10, 20.4, 10.3, 60.1])).toEqual(20.9);
+});
 // 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 of numeric and non-numeric values, it should return the total of the numeric values`, () => {
+  expect(sum(['hey', 10, 'hi', 60, 10])).toEqual(80);
+  expect(sum(['i', 'love', 10, 'code', 'hi', 80, 60, 'your', 'future', 10])).toEqual(160);
+});
 // 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 of non-numeric values, it should return zero`, () => {
+  expect(sum(['i', 'love', 'code', 'your', 'future'])).toEqual(0);
+})

Sprint-1/refactor/includes.js

@@ -1,13 +1,16 @@
 // 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];
+  for (const item of list) {
+    const element = item;
     if (element === target) {
       return true;
     }
   }
   return false;
 }
+console.log(includes(["a", "b", "c", "d"], "c"))
 
-module.exports = includes;
+
+
+module.exports = includes;