(count.js) Implement character counting logic in countChar function and (count.test.js) add test for zero occurrences

Author: Alex-Os-Dev-Lab

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

@@ -1,5 +1,17 @@
 function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  // 1. Assign a variable to keep track of the count
+  let count = 0;
+
+  // 2. Loop through all chars in the string
+  for (let char = 0; char < stringOfCharacters.length; char++) {
+    // 3. Check if the current char matches the one we are looking for
+    if (stringOfCharacters[char] === findCharacter) {
+      count++; // If it's a match, add 1 to our tally
+    }
+  }
+
+  // 4. Return the final tally after the loop finishes
+  return count;
 }
 
 module.exports = countChar;

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

@@ -22,3 +22,10 @@ test("should count multiple occurrences of a character", () => {
 // And a character `char` that does not exist within `str`.
 // When the function is called with these inputs,
 // Then it should return 0, indicating that no occurrences of `char` were found.
+
+test("should return 0 when the character does not occur in the string", () => {
+  const str = "Will this work?";
+  const char = "z";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});