Write a function to measure the performance of the given function.

Clarifying Questions

• What is the expected output of the function?
• Should this work with both sync and async functions?
• Do we need to return value from single run, average or percentile of multiple runs?

Explanation

This javascript utility function measures the performance of a given function by executing it multiple times and recording the execution times. It handles both synchronous and asynchronous functions and manages timeouts using Promise.race. The function then calculates a statistical output (e.g., median or 50th percentile) to report consistent performance results.

Solution Code

Scale-Ups

• Add support for async functions
• Add support for multiple runs and return average or percentile
• Add timeout handling for long-running functions

Interviewer's Expectations

• Use of performance.now() for precise time measurement
• Correct handling of both sync and async functions
• Understanding of Promise, await, Promise.race, etc.
• Timeout handling for slow or hanging functions.
• Accepts configurable options like number of runs and timeout
• Measures performance over multiple runs, not just one
• Returns statistical output (e.g., median/percentile) rather than just average