In CSS, colours can be specified by a "hex triplet" - a three byte (six digit) hexadecimal number where each byte represents the red, green, or blue components of the colour. For instance,
#FF0000 is completely red, and is equivalent to
rgb(255, 0, 0).
Colours can also be represented by the shorthand notation which uses three hexadecimal digits. The shorthand expands to the six digit form by duplicating each digit. For instance,
Since there are fewer digits in the hex shorthand, fewer colours can be represented.
Write a program or function that takes a six digit hexadecimal colour code and outputs the closest three-digit colour code.
Here's an example:
- Input hex code: #28a086
- Red component
- 0x28 = 40 (decimal)
- 0x22 = 34
- 0x33 = 51
- 0x22 is closer, so the first digit of the shortened colour code is 2
- Green component
- 0xa0 = 160
- 0x99 = 153
- 0xaa = 170
- 0x99 is closer, so the second digit is 9
- Blue component
- 0x86 = 134
- 0x77 = 119
- 0x88 = 136
- 0x88 is closer, so the third digit is 8
- The shortened colour code is #298 (which expands to #229988)
Your program or function must accept as input a six digit hexadecimal colour code prepended with
# and output a three digit colour code prepended with
- #FF0000 → #F00
- #00FF00 → #0F0
- #D913C4 → #D1C
- #C0DD39 → #BD3
- #28A086 → #298
- #C0CF6F → #BC7
This is a code-golf challenge, so shortest answer in your language wins! Standard rules apply.