Mathematical tricks of Javascript

factorial formula

Factorial (n!):

Factorial definition formula

Recursive factorial formula

Now we solve the Recursive way

Fibonacci Series:

Prime Number:

Truthy Vs Falsy:

  • false
  • 0 (zero)
  • '' or "" (empty string)
  • null
  • undefined
  • NaN
  • '0' (a string containing a single zero)
  • 'false' (a string containing the text “false”)
  • [] (an empty array)
  • {} (an empty object)
  • function(){} (an “empty” function)



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Rima Wahid

Throughout my career as a front end developer I've emphasized the importance of scalable and well documented.