In addition to @portugalcoin's notes, your tutorial does not really capture a proper structure nor content of a tutorial.

• Simply stating aggregate functions such as sum/avg, and copy/pasting the same comment over and over does not stand as a proper tutorial
• You did not provide any real life useful scenario of utilizing those functions
• You did not provide any screenshots to capture your proper work and result of work done.
• Your code (github) simply defined variables, you did not even print the result
• What does this even mean: "we mentioned name to find maximum by passing $.name(lambda expression) as a parameter of select function" basically a copy paste error from sentence above?
  Please work on providing better quality tutorials in the future.

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