3.4 KiB
| category | name | contributors | filename | |||
|---|---|---|---|---|---|---|
| tool | Rink |
|
LearnRink.txt |
Rink is a unit-aware calculator for the command line and the browser.
Start the Rink REPL with rink, or run a calculation with
rink '10 pounds to kilograms'.
Rink values are numbers with units:
> 123 kilometers
123 kilometer (length)
> 1.5 radians
1.5 radian (angle)
You don't need units, though. Values can be "dimensionless":
> 123
123 (dimensionless)
> -456.78
-456.78 (dimensionless)
Rink supports arbitrary precision:
> 2/3 * 1/6
0.[1]... (dimensionless)
> 1e20000 / 2e20001
0.05 (dimensionless)
Convert units, including currencies:
> 10 pounds to kilograms
approx. 4.535923 kilogram (mass)
> 32 degF to degC
0 °C (temperature)
> 1 KiB to B
1024 byte (information)
> 2 halfnotes to wholenote
1 wholenote (musical_note_length)
> 1 EUR to INR
97.4838 INR (money)
> 52 weeks to seconds
31449600 second (time)
You can use -> instead of to, which can be easier to read:
> 52 weeks -> seconds
31449600 second (time)
Do math with units:
> 1.5 hours + 30 minutes
2 hour, 0 second (time)
> 100 GB / 25 mbps
8 hour, 53 minute, 20 second (time)
Combine math with unit conversion:
> 12 megabytes + 34 kilobytes + 56 bytes -> bytes
12034056 byte (information)
Convert a time to another time zone:
> #2025-04-20T18:09 America/Chicago# -> "Africa/Lagos"
2025-04-21 00:09:00 WAT
> #01:23# -> "America/Sao_Paulo"
2019-01-23 05:23:00 -02
> now -> "Asia/Yangon"
2019-01-23 17:26:00 +0630
Compute time deltas:
> #2025-01-23# - #2024-02-10#
49 week, 5 day, 0 second (time)
> #2025-01-23# - #2024-02-10# -> day
348 day (time)
> #2025-01-23# - #2024-02-10# -> hour
8352 hour (time)
> now - #2025-01-01# -> day
109 day (time)
Math with time deltas:
> now + 3 days
2020-01-26 01:23:00 +00:00
> now - (four score years + seven years)
1933-01-22 23:40:20.182200 +00:00 (92 years ago)
Remember that months and years are weird (at no fault of Rink).
Compare Rink's default year and month units to alternate ones:
> 1 year -> days
approx. 365.2421 day (time)
> 1 calendaryear -> days
365 day (time)
> 1 month -> days
approx. 30.43684 day (time)
> 1 lunarmonth -> days
approx. 29.53058 day (time)
Work with percentages:
> 0.25 -> percent
25 percent (dimensionless)
> 25 percent
0.25 (dimensionless)
> 100 meters * 25 percent
25 meter (length)
Use helpers like "billion" and "thousand":
> 1 billion / 1 million
1000 (dimensionless)
> 1 billion kilograms / 1 million pounds
approx. 2204.622 (dimensionless)
Convert numbers between bases, such as hexadecimal and binary:
> 0x45
69 (dimensionless)
> 0b1010011010
666 (dimensionless)
> 420 -> base 16
1a4 (dimensionless)
> 420 -> hex
1a4 (dimensionless)
> 420 -> base 2
110100100 (dimensionless)
> 420 -> bin
110100100 (dimensionless)
Use simple math functions, like square root. Note that these do not use arbitrary precision.
> sqrt(4)
approx. 2 (dimensionless)
> sqrt(4) meters
approx. 2 meter (length)
Rink supports a number of constants, such as the volume of celestial bodies:
> volume of uranus / volume of moon
approx. 3111.849 (dimensionless)