diff --git a/solutions/javascript/bird-watcher/1/bird-watcher.js b/solutions/javascript/bird-watcher/1/bird-watcher.js
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+// @ts-check
+//
+// The line above enables type checking for this file. Various IDEs interpret
+// the @ts-check directive. It will give you helpful autocompletion when
+// implementing this exercise.
+
+/**
+ * Calculates the total bird count.
+ *
+ * @param {number[]} birdsPerDay
+ * @returns {number} total bird count
+ */
+export function totalBirdCount(birdsPerDay) {
+  let total = 0;
+for(let i = 0; i < birdsPerDay.length; i++){
+  total += birdsPerDay[i];
+}
+  return total;
+}
+
+/**
+ * Calculates the total number of birds seen in a specific week.
+ *
+ * @param {number[]} birdsPerDay
+ * @param {number} week
+ * @returns {number} birds counted in the given week
+ */
+export function birdsInWeek(birdsPerDay, week) {
+  const startIndex = (week - 1) * 7;
+  const endIndex = startIndex + 7 ;
+  let total = 0;
+   for ( let i = startIndex; i < endIndex; i++){
+     total += birdsPerDay[i]
+   }
+  return total;
+}
+
+/**
+ * Fixes the counting mistake by increasing the bird count
+ * by one for every second day.
+ *
+ * @param {number[]} birdsPerDay
+ * @returns {void} should not return anything
+ */
+export function fixBirdCountLog(birdsPerDay) {
+  
+  for (let i = 0; i < birdsPerDay.length; i += 2) {
+    birdsPerDay[i] += 1;
+  }
+
+
+}