Scalable Capital challenge

javascript/scalablecapital/banana.js

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+// Write a function solution that gets String as the input and calculates
+// how many times word 'BANANA' could exactly be written with the given letters.
+
+function solution(S) {
+    let str = (' ' + S).slice(1);
+    let flag = true;
+    let b = 0;
+    let a = 0;
+    let n = 0;
+    let iterationCount = 0;
+
+    for (let i = 0; i < str.length; i++) {
+        let c = str[i];
+        switch (c) {
+            case 'B':
+                b++;
+                break;
+            case 'A':
+                a++;
+                break;
+            case 'N':
+                n++;
+                break;
+        }
+    }
+
+    while (flag) {
+        b = b - 1;
+        a = a - 3;
+        n = n - 2;
+        if (b < 0 || a < 0 || n < 0) {
+            flag = false;
+        } else {
+            iterationCount++;
+        }
+    }
+
+    return iterationCount;
+}
+
+
+// Function to check if a number is prime
+function isPrime(num) {
+    if (num <= 1) return false;
+    if (num === 2) return true;
+    if (num % 2 === 0) return false;
+    for (let i = 3; i <= Math.sqrt(num); i += 2) {
+        if (num % i === 0) return false;
+    }
+    return true;
+}
+
+// Export for testing
+module.exports = {isPrime, solution};