How do you determine two values same or not using 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
The Object.is() method determines whether two values are the same value. For example, the usage with different types of values would be,
Object.is("hello", "hello"); // true
Object.is(window, window); // true
Object.is([], []); // false
Two values are considered identical if one of the following holds:
- both undefined
- both null
- both true or both false
- both strings of the same length with the same characters in the same order
- both the same object (means both object have same reference)
- both numbers and
both +0
both -0
both NaN
both non-zero and both not NaN and both have the same value.
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).
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