The title says it all; Given a number in the binary (base-2) number system, output the same number expressed in unary (base-1).

You may use any reasonable input and output format, i.e. strings, list of characters / digits, etc. You can use any digits you like to represent the binary and unary numbers. You may choose to assume that the binary number will have no more than 8 bits, and/or that it will always be left-padded with zeroes to a certain length.

One method you may use to achieve this task is documented at this esolangs.org article:

1. Replace all 1s with 0* (Using * as the unary digit; you may use any character.)
2. Replace all *0s with 0**.
3. Remove all 0s.

Examples:

• 1001 → *********
• 1010 → **********
• 00111111 → ***************************************************************

This is code-golf, so the shortest answer in each language wins.

The title says it all; Given a number in the binary (base-2) number system, output the same number expressed in unary (base-1).

You should take the binary number as a string (optionally with a separator), list, or equivalent structure of digits, using any number or digit you like for the digits. The unary output can use any aforementioned format, and it should use a single-digit throughout the number but does not have to be consistent for different input values. You may choose to assume that the binary number will have no more than 8 bits, and/or that it will always be left-padded with zero bits to a certain length.

One method you may use to achieve this task is documented at this esolangs.org article:

1. Replace all 1s with 0* (Using * as the unary digit; you may use any character.)
2. Replace all *0s with 0**.
3. Remove all 0s.

Here are some examples, using 0 and 1 for the binary digits and * for the unary digit:

• 1001 → *********
• 1010 → **********
• 00111111 → ***************************************************************
• 00000 → (empty output)

This is code-golf, so the shortest answer in each language wins.