NW | 25-ITP-Sep| Ahmad Hmedan | Sprint 1 | Sprint 1 Coursework

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];
-  return median;
+
+  if (!Array.isArray(list)) return null;
+  const numericList = list.filter(
+    (item) => typeof item === "number" && !isNaN(item)
+  );
+
+  if (numericList.length === 0) return null;
+
+
+
+  numericList.sort((a, b) => a - b);
+  if (numericList.length % 2 === 0) {
+    let middleIndex = numericList.length / 2;
+    return (numericList[middleIndex] + numericList[middleIndex - 1]) / 2;
+  } else {
+    const middleIndex = Math.floor(numericList.length / 2);
+    const median = numericList.splice(middleIndex, 1)[0];
+    return median;
+  }
 }
 
 module.exports = calculateMedian;

Sprint-1/implement/dedupe.js

@@ -1 +1,17 @@
-function dedupe() {}
+function dedupe(elements) {
+  const elementsClone = [...elements];
+  if (elementsClone.length === 0) return elementsClone;
+
+  for (let i = 1; i < elementsClone.length; i++) {
+    for (let j = i; j > 0; j--) {
+      if (elementsClone[i] === elementsClone[j - 1]) {
+        elementsClone.splice(i, 1);
+        i--; // because I deleted one element from my array
+        break;
+      }
+    }
+  }
+  return elementsClone;
+}
+
+module.exports = dedupe;

Sprint-1/implement/dedupe.test.js

@@ -16,7 +16,41 @@ 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");
+describe("Dedupe", () => {
+    it("returns an empty array when it given an empty array", () => {
+        expect(dedupe([])).toEqual([]);
+    });
+    [
+        { input: [10, 12, 13], expected: [10, 12, 13] },
+        {
+            input: ["a", "b", "keke", 1, 21, 3],
+            expected: ["a", "b", "keke", 1, 21, 3],
+        },
+        { input: [null, undefined, 1, 3], expected: [null, undefined, 1, 3] },
+    ].forEach(({ input, expected }) =>
+        it(`returns a copy of the original array when given an array with no duplicates, for [${input}]`, () =>
+            expect(dedupe(input)).toEqual(expected))
+    );
+    [
+        { input: [10, 12, 10, 13], expected: [10, 12, 13] },
+        { input: [1, "a", "a", "b", 1, 1, "a"], expected: [1, "a", "b"] },
+        {
+            input: [null, undefined, 1, 3, 1, 1, 1, 1],
+            expected: [null, undefined, 1, 3],
+        },
+    ].forEach(({ input, expected }) => {
+        it(`remove duplicates from [${input}]`, () => expect(dedupe(input)).toEqual(expected));
+    });
+    it("treats different types separately", () => {
+        expect(dedupe([1, "1", true, "true", false, 0])).toEqual([1, "1", true, "true", false, 0]);
+    });
+    it("Test if the input array and result array are different",()=>{
+        const input=[1,2,3,3,2,1]
+        const result=dedupe(input)
+        expect(input).not.toBe(result)
+        expect(result).toEqual([1,2,3])
+    })
+});
 
 // Given an array with no duplicates
 // When passed to the dedupe function

Sprint-1/implement/max.js

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

Sprint-1/implement/max.test.js

@@ -16,7 +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");
+describe("findMax", () => {
+  it("return -Infinity when given an empty array", () => {
+    expect(findMax([])).toEqual(-Infinity);
+  });
+
+  [
+    { input: [0], expected: 0 },
+    { input: [-12], expected: -12 },
+    { input: [4], expected: 4 },
+  ].forEach(({ input, expected }) =>
+    it(`return the same number when the array has one element, for array[${input}] `, () =>
+      expect(findMax(input)).toEqual(expected))
+  );
+  [
+    { input: [10, 11, 13, 3, 4], expected: 13 },
+    { input: [99, 3, 10, 11], expected: 99 },
+    { input: [-12, -33, -10, -111], expected: -10 },
+    { input: [-1, -11, -33], expected: -1 },
+    { input: [-99, -2, 0, 0, -2], expected: 0 },
+  ].forEach(({ input, expected }) =>
+    it(`return the largest number for array containing, positive, negative, or mixed values , for array [${input}]`, () =>
+      expect(findMax(input)).toEqual(expected))
+  );
+  [
+    { input: [11.1, 14.1, 17.223, 16], expected: 17.223 },
+    { input: [11.1, 11.33, 11.34, 11.2999], expected: 11.34 },
+  ].forEach(({ input, expected }) =>
+    it(`give an array with decimal numbers, return the largest decimal numbers for array [${input}]`, () =>
+      expect(findMax(input)).toEqual(expected))
+  );
+
+  it(`given an array with non-number values , return the largest after ignore the no-number values for an array  input:["a",2,null,undefined,13,18]`, () => {
+    expect(findMax(["a", 2, null, undefined, 13, 18])).toEqual(18);
+  });
+  it(`given an array with only non-number values , return -infinity`, () => {
+    expect(findMax(["a", "2", null, undefined, "ahmad", "Hmedan"])).toEqual(
+      -Infinity
+    );
+  });
+});
 
 // Given an array with one number
 // When passed to the max function

Sprint-1/implement/sum.js

@@ -1,4 +1,12 @@
 function sum(elements) {
+  if (!Array.isArray(elements)) return 0;
+  const numericElements = elements.filter(Number.isFinite)
+  if (numericElements.length === 0) return 0;
+  let sum = 0;
+  for (let i = 0; i < numericElements.length; i++) {
+    sum += numericElements[i];
+  }
+  return sum;
 }
 
 module.exports = sum;

Sprint-1/implement/sum.test.js

@@ -13,7 +13,45 @@ 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")
+describe("sum", () => {
+  it("return 0 when given an empty array", () => {
+    expect(sum([])).toBe(0);
+  });
+
+  [
+    { input: [0], expected: 0 },
+    { input: [-12], expected: -12 },
+    { input: [4], expected: 4 },
+  ].forEach(({ input, expected }) =>
+    it(`return the same number when the array has one element, for array[${input}] `, () =>
+      expect(sum(input)).toBe(expected))
+  );
+  [
+    { input: [10, 11, 13, 3, 4], expected: 41 },
+    { input: [99, 3, 10, 11], expected: 123 },
+    { input: [-12, -33, -10, -111], expected: -166 },
+    { input: [-1, -11, -33], expected: -45 },
+    { input: [-99, -2, 0, 0, -2], expected: -103 },
+  ].forEach(({ input, expected }) =>
+    it(`return the sum of numbers for array containing, positive, negative, or mixed values , for array [${input}]`, () =>
+      expect(sum(input)).toBe(expected))
+  );
+
+  [
+    { input: [11.1, 14.1, 17.223, 16], expected: 58.423 },
+    { input: [11.1, 11.33, 11.34, 11.2999], expected: 45.0699 },
+    { input: [1.2, 0.6, 0.005], expected: 1.805 },
+  ].forEach(({ input, expected }) =>
+    it(`returns the  sum for decimal values for array [${input}]`, () =>
+      expect(sum(input)).toBeCloseTo(expected))
+  );
+  it("ignores non-numeric values and returns the sum of numeric ones", () => {
+    expect(sum(["2", 2, null, undefined, 13, 18])).toBe(33);
+  });
+  it("returns 0 when no numeric values are present", () => {
+    expect(sum(["a", "2", null, undefined, "ahmad", "Hmedan"])).toBe(0);
+  });
+});
 
 // Given an array with just one number
 // When passed to the sum function

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;
-    }
+  for (const element of list) {
+    if (element === target) return true;
   }
   return false;
 }
-
 module.exports = includes;