How random is JavaScript’s Math.random?

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Given numbers between 1 and 100.

  • 9 have 1 digit (1-9)
  • 90 have 2 digits (10-99)
  • 1 has 3 digits (100)

Given numbers between 1 and 1000.

  • 9 have 1 digit
  • 90 have 2 digits
  • 900 have 3 digits
  • 1 has 4 digits

and so on.

So if you select some at random, then that vast majority of selected numbers will have the same number of digits, because the vast majority of possible values have the same number of digits.

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