Web Reference: Sep 12, 2025 · Explanation: In JavaScript, an object can’t have duplicate keys. If you try to add the same key multiple times, the last value overwrites the earlier ones. It’s like writing a name on a label and then sticking a new value over it. Here, the key a is defined twice: first with 1, then with 3. Find 100+ JavaScript interview questions and answers to assess candidates' skills in ES6+, DOM manipulation, asynchronous programming, event handling, and front-end development. Mar 24, 2026 · Explore 100+ JavaScript interview questions and answers for 2026, covering basics to advanced topics like closures, hoisting, promises, DOM, and ES6.
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