Function realted concept in the video

#1

at timestamp 8:20 how are we calling sqrt_n(10) as there is no argument list in function sqrt_n .

#2

In javascript passing parameters is optional in function, it automatically declares undefined for the variable that is passed.
Refer to this link: https://stackoverflow.com/questions/11107823/what-happens-if-i-dont-pass-a-parameter-in-a-javascript-function/11107894#:~:text=That’s%20just%20how%20JavaScript%20works,missing%20from%20a%20function%20call.&text=There%20need%20be%20no%20relationship,function%20and%20the%20number%20declared.

#3

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