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Returns the number of times a function executed per second.
hz is the unit for
hertz, the unit of frequency defined as one cycle per second.
performance.now() to get the difference in milliseconds before and after the iteration loop to calculate the time elapsed executing the function
Return the number of cycles per second by converting milliseconds to seconds and dividing it by the time elapsed.
Omit the second argument,
iterations, to use the default of 100 iterations.