What are the placeholders from console object?
Interviewer Expectations for this Question
01
Core Competency
Assesses fundamental understanding of JavaScript conventions, runtime behavior, and memory/performance considerations.
02
Evaluation Criteria
Hiring managers look for precision, avoidance of ambiguous jargon, and ability to explain trade-offs under real production conditions.
Comprehensive Model Answer
Verified Solution
Below are the list of placeholders available from console object,
- %o — It takes an object,
- %s — It takes a string,
- %d — It is used for a decimal or integer
These placeholders can be represented in the console.log as below
const user = { name: "John", id: 1, city: "Delhi" };
console.log(
"Hello %s, your details %o are available in the object form",
"John",
user
); // Hello John, your details {name: "John", id: 1, city: "Delhi"} are available in object
Candidate Response Strategy & Interview Tips
- Start with a concise one-sentence summary: Deliver a direct, confident answer first before expanding into nuances.
- Demonstrate real-world trade-offs: Discuss where this approach excels and when you would avoid it in production systems.
- Discuss complexity & edge cases: Proactively explain time/space complexity or boundary conditions (null values, scale limits).
- Prepare for interviewer follow-ups: Technical hiring panels frequently probe deeper into concurrency, backward compatibility, or alternative libraries.