Implement countChar function and add tests for character occurrences

Author: chefmatthaus-hub

practice-tdd/count.js

@@ -1,3 +1,8 @@
 export function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  let count = 0;
+  for (let i = 0; i < stringOfCharacters.length; i++)
+    if (stringOfCharacters[i] === findCharacter) {
+      count++;
+    }
+  return count;
 }

practice-tdd/count.test.js

@@ -17,6 +17,20 @@ test("should count multiple occurrences of a character", () => {
   expect(count).toEqual(5);
 });
 
+test("should return 0 when character is not found", () => {
+  const str = "hello";
+  const char = "z";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});
+
+test("should count 2 occurrences of n", () => {
+  const str = "banana";
+  const char = "n";
+  const count = countChar(str, char);
+  expect(count).toEqual(2);
+});
+
 // Scenario: No Occurrences
 // Given the input string `str`,
 // And a character `char` that does not exist within `str`.