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jestFunctions.js

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+function calculateDiscount(price, discountRate) {
+    if (typeof price !== 'number' || typeof discountRate !== 'number') return null;
+    if (discountRate < 0 || discountRate > 1) return null;
+
+    // TODO: Implement logic
+    return price * discountRate;
+}
+
+function filterProducts(products, callback) {
+    if (!Array.isArray(products) || typeof callback !== 'function') return [];
+    // TODO: Implement filtering logic
+    filteredProducts = products.filter(callback)
+    return filteredProducts;
+}
+
+array = [43, 54, 23,23, 54, 5, 2, 6, 25];
+hello = filterProducts(array, (num) => num >= 18)
+console.log(hello)
+
+function sortInventory(inventory, key) {
+    if (!Array.isArray(inventory) || typeof key !== 'string') return [];
+    sortedArray = inventory.sort(key)
+    // TODO: Implement sorting logic
+    return sortedArray;
+}
+
+
+sortedArray = sortInventory((a, b) => a - b);
+console.log(sortedArray);