1.0.2 • Published 6 years ago
base70 v1.0.2
Description
Small functions to convert numbers to base 70 string (e.g. 1520893643779 = "6vv6Bu~") and back. Provides more efficient way to store big numbers (e.g. for IDs or to reduce JSON size):
| bytes | max value | string representation |
|---|---|---|
| 1 | 69 | "~" |
| 2 | 4899 | "~~" |
| 3 | 342999 | "~~~" |
| 4 | 24009999 | " |
| 5 | 1680699999 | " |
| 6 | 117648999999 | " |
| 7 | 8235429999999 | " |
| 8 | 576480099999999 | " |
toBase70(number)- converts a number (int) to a string (radix = 70)fromBase70(string)- parses a string (result of toBase70 function) and returns an number (int).
*currently works only with unsigned integers
Encoding
toBase70() produces only URL friendly characters. Actually all of them except - (which can be used as separator between encoded values)
| Symbol | Value |
|---|---|
| ! | 0 |
| ' | 1 |
| ( | 2 |
| ) | 3 |
| * | 4 |
| . | 5 |
| 0 | 6 |
| 1 | 7 |
| 2 | 8 |
| 3 | 9 |
| 4 | 10 |
| 5 | 11 |
| 6 | 12 |
| 7 | 13 |
| 8 | 14 |
| 9 | 15 |
| A | 16 |
| B | 17 |
| C | 18 |
| D | 19 |
| E | 20 |
| F | 21 |
| G | 22 |
| H | 23 |
| I | 24 |
| J | 25 |
| K | 26 |
| L | 27 |
| M | 28 |
| N | 29 |
| O | 30 |
| P | 31 |
| Q | 32 |
| R | 33 |
| S | 34 |
| T | 35 |
| U | 36 |
| V | 37 |
| W | 38 |
| X | 39 |
| Y | 40 |
| Z | 41 |
| _ | 42 |
| a | 43 |
| b | 44 |
| c | 45 |
| d | 46 |
| e | 47 |
| f | 48 |
| g | 49 |
| h | 50 |
| i | 51 |
| j | 52 |
| k | 53 |
| l | 54 |
| m | 55 |
| n | 56 |
| o | 57 |
| p | 58 |
| q | 59 |
| r | 60 |
| s | 61 |
| t | 62 |
| u | 63 |
| v | 64 |
| w | 65 |
| x | 66 |
| y | 67 |
| z | 68 |
| ~ | 69 |