Implement countChar function and add tests for character occurrences

Author: Maryanne-K

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

@@ -1,5 +1,11 @@
 function countChar(stringOfCharacters, findCharacter) {
-  return 5
-}
+  let count = 0;
+  for(let char of stringOfCharacters){
+    if (char === findCharacter) {
+      count++;
+    }
+  }
+  return count;
+} 
 
 module.exports = countChar;

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

@@ -16,6 +16,12 @@ test("should count multiple occurrences of a character", () => {
   const count = countChar(str, char);
   expect(count).toEqual(5);
 });
+test ("should return 0 when the character does not exist in the string", () => {
+  const str = "exist";
+  const char = "z";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});
 
 // Scenario: No Occurrences
 // Given the input string `str`,