README.md

pony-metric

Library for physical dimensions, i.e. mainly SI units and conversions between them

Work in progress

This library is not complete and constantly evolving, seeking to add more dimensions, more units and more conversions. Please submit Pull Requests.

Missing low hanging fruit

• add(), sub(), div() and mul() operators for all. See energy.pony for example.

• Formulas, such a F = m * a, so that conversion can be done easily. See energy.pony for example.

• Common Imperial units, such as mph andft.

Example

actor Main
  new create( env:Env ) =>
    let a = Energy.unit_kWh(1000)
    
    env.out.print(a.string())
    env.out.print(a.to_J().string())
    env.out.print(a.to_GJ().string())
    env.out.print(a.to_Nm().string())
    env.out.print(a.to_Wh().string())
    env.out.print(a.to_MWh().string())
    
    let b = Energy.unit_MWh(0.9)

    let c = a + b
    env.out.print(c.string())
    
    let d = a - b
    env.out.print(d.string())

    let e = b - a
    env.out.print(e.string())

    try
      let f = Energy.parse("23.45 kWh")?.to_kJ()
      env.out.print(f.string())
    else
      env.out.print("Can't parse.")
    end

Output:

1000 kWh
3.6e+09 J
3.6 GJ
3.6e+09 Nm
1e+06 Wh
1 MWh
1900 kWh
100 kWh
-0.1 MWh
84420 kJ