add js

javascript/0904-fruit-into-baskets.js

@@ -0,0 +1,26 @@
+/**
+ * @param {number[]} fruits
+ * @return {number}
+ */
+var totalFruit = function (fruits) {
+    let count = new Map();
+    let [left, total, res] = [0, 0, 0];
+
+    for (fruit of fruits) {
+        count.set(fruit, (count.get(fruit) || 0) + 1);
+        total++;
+
+        while (count.size > 2) {
+            let f = fruits[left];
+            count.set(f, count.get(f) - 1);
+            total -= 1;
+            left += 1;
+            if (!count.get(f)) {
+                count.delete(f);
+            }
+        }
+        res = Math.max(res, total);
+    }
+
+    return res;
+};