解决方法
哇,还有比我预想的还要多一些.这是我认为是一个完整的列表,按字母顺序,从他们的文档中删除示例使用.我也注意到我是否无法让他们在本地运行.
require 'alchemist' Alchemist.setup 8.miles.to.meters 10.kilometers + 1.mile # 11.609344 kilometers
这一次出现过时了,最后一次提交是5年前,对我来说似乎没有运行在1.9.3.
include Measurement::Length Inch.new(12).to_centimeters # => #<Measurement::Length::Centimeter:0x173c2b4 @units=30.48>
require "phys/units"
Q = Phys::Quantity
U = Phys::Unit
Q[1.23,'km'] + Q[4.56,'m'] #=> Phys::Quantity[1.23456,'km']
Q[123,'mile'] / Q[2,'hr'] #=> Phys::Quantity[61,'mile/hr']
Q[61,'miles/hr'].want('m/s') #=> Phys::Quantity[27.26944,'m/s']
Q[1.0,'are'] == Q[10,'m']**2 #=> true
> Quantity
请注意,这个说明README中没有生产就绪.
require 'quantity/all' 1.meter #=> 1 meter 1.meter.to_feet #=> 3.28083... foot c = 299792458.meters / 1.second #=> 299792458 meter/second newton = 1.meter * 1.kilogram / 1.second**2 #=> 1 meter*kilogram/second^2 newton.to_feet #=> 3.28083989501312 foot*kilogram/second^2 newton.convert(:feet) #=> 3.28083989501312 foot*kilogram/second^2 jerk_newton = newton / 1.second #=> 1 meter*kilogram/second^3 jerk_newton * 1.second == newton #=> true
> SY
见Boris Stitnickey’s answer.
> ruby-measurement
require 'ruby-measurement'
measurement = Measurement.parse('3 feet') # => 3.0 ft.
measurement.convert_to(:yards) # => 1.0 yd.
measurement.convert_to(:in) # => 36.0 in.
measurement.convert_to(:inches) # => 36.0 in.
measurement1 = Measurement.parse('3 feet') # => 3.0 ft.
measurement2 = Measurement.parse('6 inch') # => 6.0 in.
measurement1 + measurement2 # => 3.5 ft.
require 'ruby-units'
unit = Unit("mm") # unit only (defaults to a scalar of 1)
unit = Unit("1 mm") # create a simple unit
unit = Unit("1 kg*m^2/s^2") # complex unit
unit1 =~ unit2 # true if units are compatible
unit1.compatible?(unit2) # true if units are compatible
unit1 = unit >> "ft" # convert to 'feet'
unit3 = unit1 + unit2 # resulting object will have the units of unit1
unit1 === unit2 # true if units and quantity are the same,even if 'equivalent' by <=>
unit.convert_to('ft') # convert
(unit1 + unit2).convert_to('ft') # converts result to 'ft'
require 'units' three_meters = 3.meters two_meters = 2.m one_inch = 1.inch 3.meters.to_inches # => 118.1103 inch 10.inches.to_mm # => 254.0 millimeter
> Unitwise
require 'unitwise/ext'
1.yard == (1.foot * 3) # => true
1.quart < 1.liter # => true
2.meter + 3.inch - 1.yard # => <Unitwise::Measurement 1.1618 meter>
1.convert_to('kg.m2/s2') == 1.joule # => true
(20.kg * 9.8.convert_to('m/s2')).to_pound_force # => <Unitwise::Measurement 44.06255284754326 pound_force>
(300.horsepower * 60.second).to_calorie # => <Unitwise::Measurement 3208077.8414151203 calorie>
> Van/Unit
像另一张海报,我有麻烦让这个工作.但是,您可以看到Jörg W Mittag’s answer的使用.
作为Unitwise的作者,很明显,这是我最喜欢的.我鼓励你至少检查一下.
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