JS2-week1 | dedupe.js & dedupe.test.js done

week-1/implement/dedupe.js

@@ -1 +1,15 @@
-function dedupe() {}
+function dedupe(arr) {
+  const deduplicatedArray = [];
+
+  for (const item of arr) {
+    if (!deduplicatedArray.includes(item)) {
+      deduplicatedArray.push(item);
+    }
+  }
+
+  return deduplicatedArray;
+}
+
+console.log(dedupe(["a", "a", "a", "b", "b", "c"]));
+
+module.exports = dedupe;

week-1/implement/dedupe.test.js

@@ -15,12 +15,25 @@ E.g. dedupe([5, 1, 1, 2, 3, 2, 5, 8]) target output: [5, 1, 2, 3, 8]
 // 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", () => {
+  const result = dedupe([]);
+  expect(result).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, returns a copy of the original array", () => {
+  const originalArray = ["a", "b", "c"];
+  const result = dedupe(originalArray);
+  expect(result).toEqual(originalArray);
+});
 
 // Given an array with strings or numbers
 // When passed to the dedupe function
 // Then it should remove the duplicate values
+test("given an array with strings or numbers, removes the duplicate values", () => {
+  const arrayWithDuplicates = [1, "a", "b", 1, "c", "b", 2];
+  const result = dedupe(arrayWithDuplicates);
+  expect(result).toEqual([1, "a", "b", "c", 2]);
+});