WEST MIDLANDS-JAN-ITP|SEGUN FOLAYAN|DATA GROUPS|SPRINT-1

Sprint-1/fix/median.js

@@ -1,11 +1,14 @@
-// Fix this implementation
-// Start by running the tests for this function
-// If you're in the Sprint-1 directory, you can run `npm test -- fix` to run the tests in the fix directory
+
+module.exports = calculateMedian;
 
 function calculateMedian(list) {
   const middleIndex = Math.floor(list.length / 2);
-  const median = list.splice(middleIndex, 1)[0];
-  return median;
+
+  if (list.length % 2 === 1) {
+    return list[middleIndex]; // Return the middle element for odd-length lists
+  }
+
+  return (list[middleIndex] + list[middleIndex - 1]) / 2; // Return the average of the two middle elements for even-length lists
 }
 
 module.exports = calculateMedian;

Sprint-1/fix/median.test.js

@@ -24,3 +24,4 @@ describe("calculateMedian", () => {
     expect(list).toEqual([1, 2, 3]);
   });
 });
+

Sprint-1/implement/dedupe.js

@@ -1 +1,9 @@
-function dedupe() {}
+
+
+
+function dedupe(arr) {
+    return [...new Set(arr)];
+  }
+
+module.exports=dedupe;
+

Sprint-1/implement/dedupe.test.js

@@ -17,11 +17,30 @@ E.g. dedupe([1, 2, 1]) target output: [1, 2]
 // 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 array with no duplicates, it should return a copy of the original array");
+test.todo("given an array with strings or numbers it should remove the duplicate values, preserving the first occurrence of each element");
+
+
+
+
+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 a copy of the original array", () => {
+    expect(dedupe([5, 1, 2, 3, 8])).toEqual([5, 1, 2, 3, 8]);
+});
 
 // 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 it should remove the duplicate values, preserving the first occurrence of each element", () => {
+    expect(dedupe([5, 1, 1, 2, 3, 2, 5, 8])).toEqual([5, 1, 2, 3, 8]);
+});

Sprint-1/implement/max.js

@@ -1,4 +1,14 @@
 function findMax(elements) {
+    const newelement = elements.filter((x)=> typeof x=== "number");
+    if (newelement.length === 0){
+        return -Infinity;
+    }
+        else {
+            return Math.max(...newelement)
+    }
+
+        ;
+
 }
 
 module.exports = findMax;

Sprint-1/implement/max.test.js

@@ -17,27 +17,50 @@ 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("an empty array should return 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,return the number", () => {
+    expect(findMax([2])).toEqual(2);
+});
 
 // 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", () => {
+    expect(findMax([2,5,0,-1,-1])).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", () => {
+    expect(findMax([-1,-1,-10,-18])).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", () => {
+    expect(findMax([0.345,0.231, 0.999])).toEqual(0.999);
+}
+);
 
 // 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("when an array with non-number values is passed, it should return the max and ignore non-numeric values", () =>{
+ expect(findMax([0,-1,-1,3,4,"a","b","2"])).toEqual(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("when an array with only non-number values are passed, it should return -Infinity", () =>{
+    expect(findMax([,undefined,"one", "a", "b"])).toEqual(-Infinity);
+});