FromDigits¶

Constructs an integer from its digits.

$ wo 'FromDigits[{1, 2, 3, 4, 5}]'
12345

With base 2 (binary):

$ wo 'FromDigits[{1, 1, 1, 1, 1, 1, 1, 1}, 2]'
255

The digit list is a polynomial in the base, so any base works — base 1 sums the digits and base 0 leaves the last one:

$ wo 'FromDigits[{1, 2, 3}, 1]'
6

$ wo 'FromDigits[{1, 2}, 0]'
2

A rational, a real, or a symbol works the same way:

$ wo 'FromDigits[{1, 2}, 1/2]'
5/2

$ wo 'FromDigits[{1, 2, 3}, x]'
3 + 2*x + x^2