feat(sprint-3): implement repeat function with TDD

Author: Tarawally

Sprint-3/2-practice-tdd/repeat.js

@@ -1,5 +1,12 @@
-function repeat() {
-  return "hellohellohello";
+function repeat(str, count) {
+  if (count < 0) throw new Error("Count cannot be negative");
+  if (count === 0) return "";
+
+  let result = "";
+  for (let i = 0; i < count; i++) {
+    result += str;
+  }
+  return result;
 }
 
 module.exports = repeat;

Sprint-3/2-practice-tdd/repeat.test.js

@@ -1,32 +1,29 @@
-// Implement a function repeat
 const repeat = require("./repeat");
-// Given a target string str and a positive integer count,
-// When the repeat function is called with these inputs,
-// Then it should:
-
-// case: repeat String:
-// Given a target string str and a positive integer count,
-// When the repeat function is called with these inputs,
-// Then it should repeat the str count times and return a new string containing the repeated str values.
 
 test("should repeat the string count times", () => {
-  const str = "hello";
-  const count = 3;
-  const repeatedStr = repeat(str, count);
-  expect(repeatedStr).toEqual("hellohellohello");
+  expect(repeat("hello", 3)).toEqual("hellohellohello");
+});
+
+test("should return the original string when count is 1", () => {
+  expect(repeat("hello", 1)).toEqual("hello");
+});
+
+test("should return an empty string when count is 0", () => {
+  expect(repeat("hello", 0)).toEqual("");
 });
 
-// case: handle Count of 1:
-// Given a target string str and a count equal to 1,
-// When the repeat function is called with these inputs,
-// Then it should return the original str without repetition, ensuring that a count of 1 results in no repetition.
+test("should throw an error when count is negative", () => {
+  expect(() => repeat("hello", -1)).toThrow("Count cannot be negative");
+});
 
-// case: Handle Count of 0:
-// Given a target string str and a count equal to 0,
-// When the repeat function is called with these inputs,
-// Then it should return an empty string, ensuring that a count of 0 results in an empty output.
+test("should repeat string multiple times", () => {
+  expect(repeat("abc", 4)).toEqual("abcabcabcabc");
+});
 
-// case: Negative Count:
-// Given a target string str and a negative integer count,
-// When the repeat function is called with these inputs,
-// Then it should throw an error or return an appropriate error message, as negative counts are not valid.
+test("should handle empty string", () => {
+  expect(repeat("", 5)).toEqual("");
+});
+
+test("should handle single character", () => {
+  expect(repeat("x", 5)).toEqual("xxxxx");
+});