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Lesson 8 — Object.entries
Loop over an object
A for...of loop works on arrays, not on plain objects. Object.entries(obj) turns an object into an array of [key, value] pairs, which you can loop over and destructure in one go. Object.keys and Object.values give only the keys or only the values.
const stock = { pens: 4, cups: 2 };
console.log(Object.entries(stock)); // [ [ 'pens', 4 ], [ 'cups', 2 ] ]
for (const [item, qty] of Object.entries(stock)) { /* ... */ }
Why it matters: settings, scores and JSON from a server are usually objects, and you often need to go through every entry.
Want it another way?
Task
Loop over scores and log each name and points on its own line: ann 3, then bob 5.
Run your code — when the output matches the task, you will see a green check. Then mark the lesson complete.
Test your knowledge
Test your knowledgeA quick 3-question quiz on this lesson — instant feedback.