completed implement

Author: libanj0161

Sprint-1/implement/dedupe.js

@@ -1 +1,12 @@
-function dedupe() {}
+function dedupe(elements) {
+  const result = [];
+  for (let i = 0; i < elements.length; i++) {
+    if (!result.includes(elements[i])) {
+      result.push(elements[i]);
+    }
+  }
+
+  return result;
+}
+
+module.exports = dedupe;

Sprint-1/implement/dedupe.test.js

@@ -16,7 +16,9 @@ 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("given an empty array, it returns an empty array", () => {
+  expect(dedupe([])).toEqual([]);
+});
 
 // Given an array with no duplicates
 // When passed to the dedupe function

Sprint-1/implement/max.js

@@ -1,4 +1,18 @@
 function findMax(elements) {
-}
+  const numbersOnly = elements.filter((e) => typeof e === "number");
+
+  if (numbersOnly.length === 0) {
+    return -Infinity;
+  }
+
+  let max = numbersOnly[0];
 
+  for (let i = 1; i < numbersOnly.length; i++) {
+    if (numbersOnly[i] > max) {
+      max = numbersOnly[i];
+    }
+  }
+
+  return max;
+}
 module.exports = findMax;

Sprint-1/implement/max.test.js

@@ -16,28 +16,54 @@ 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, 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("given an array with one number, returns that number", () => {
+  expect(findMax([7])).toBe(7);
+});
+
 // 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 positive and negative numbers, returns the largest number", () => {
+  expect(findMax([-3, 7, -2, 5])).toBe(7);
+});
+
 // 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 only negative numbers, returns the closest to zero", () => {
+  expect(findMax([-10, -3, -7])).toBe(-3);
+});
+
 // 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, returns the clargest decimal number", () => {
+  expect(findMax([2.7, 6.9, 10.1])).toBe(10.1);
+});
+
 // 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 with non-number values, returns the max and ignore non-numeric values", () => {
+  expect(findMax([3, "dogs", 1, "cat", null])).toBe(3);
+});
+
 // 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, returns -Infinity", () => {
+  expect(findMax(["a", null, true, undefined])).toBe(-Infinity);
+});

Sprint-1/implement/sum.js

@@ -1,4 +1,13 @@
 function sum(elements) {
+  let total = 0;
+
+  for (let i = 0; i < elements.length; i++) {
+    if (typeof elements[i] === "number") {
+      total += elements[i];
+    }
+  }
+
+  return total;
 }
 
 module.exports = sum;

Sprint-1/implement/sum.test.js

@@ -13,24 +13,46 @@ 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, 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("given an array with one number, returns that number", () => {
+  expect(sum([42])).toBe(42);
+});
+
 // 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 containing negative numbers", () => {
+  expect(sum([-5, -6, -1])).toBe(-12);
+});
+
 // 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/float numbers, returns the correct total sum", () => {
+  expect(sum([2.75, -0.3, 0.0002])).toBeCloseTo(2.4502);
+});
+
 // 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 containing non-number values, ignore the non-numerical values and return the sum of the numerical elements", () => {
+  expect(sum(["hello", 6, true, 14])).toBe(20);
+});
+
 // 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, returns 0", () => {
+  expect(sum(["hello", undefined, "today", true])).toBe(0);
+});