What are the examples of built-in higher order functions?
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
There are several built-in higher order functions exists on arrays, strings, DOM and promise methods in javascript. These higher order functions provides significant level of abstraction. The list of functions on these categories are listed below,
- arrays: map, filter, reduce, sort, forEach, some etc.
- DOM: The DOM method
element.addEventListener(type, handler)also accepts the function handler as a second argument. - Strings: replace() method.
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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