Problem Solving with JavaScript

Combine variables, functions, arrays/objects, and DOM basics to solve a real, small problem. JavaScript's flexibility is a strength and a trap — plan your data shape first, then write the logic, rather than improvising as you go.

• Decide the data shape first (an array of objects is usually the right starting point).
• Write and test the logic in the console before wiring it to the page.
• Use console.log() liberally while developing — remove or guard it before shipping.
• Test with normal data, then edge cases (empty array, missing fields).

💡 Practical Skill: This same pattern — model the data, write the logic, connect it to the page — is how every real interactive feature on a website gets built.

const inventory = { "exercise books": 120, "pens": 45, "chalk boxes": 8 };const reorderThreshold = 10; function checkStock(stock, threshold) {  return Object.entries(stock)    .filter(([item, quantity]) => quantity < threshold)    .map(([item]) => item);} const itemsToReorder = checkStock(inventory, reorderThreshold); if (itemsToReorder.length > 0) {  console.log("Reorder needed for:", itemsToReorder.join(", "));} else {  console.log("All stock levels are healthy.");}