Resistance calculator: Difference between revisions

</lang>

=={{header|CoffeeScript}}==

<lang coffeescript>

nd = (num) -> num.toFixed(3).padStart 8

class Resistor

constructor : (@resistance,@a=null,@b=null,@symbol='r') ->

res : -> @resistance

setVoltage : (@voltage) ->

current : -> @voltage / @res()

effect : -> @current() * @voltage

report : (level) ->

print "#{nd @res()} #{nd @voltage} #{nd @current()} #{nd @effect()} #{level}#{@symbol}"

if @a then @a.report level + "| "

if @b then @b.report level + "| "

class Serial extends Resistor

constructor : (a,b) -> super 0,a,b,'+'

res : -> @a.res() + @b.res()

setVoltage : (@voltage) ->

ra = @a.res()

rb = @b.res()

@a.setVoltage ra/(ra+rb) * @voltage

@b.setVoltage rb/(ra+rb) * @voltage

class Parallel extends Resistor

constructor : (a,b) -> super 0,a,b,'*'

res : -> 1 / (1 / @a.res() + 1 / @b.res())

setVoltage : (@voltage) ->

@a.setVoltage @voltage

@b.setVoltage @voltage

build = (voltage, s) ->

stack = []

for word in s.split ' '

if word == '+' then stack.push new Serial stack.pop(), stack.pop()

else if word == '*' then stack.push new Parallel stack.pop(), stack.pop()

else stack.push new Resistor parseFloat word

node = stack.pop()

node.setVoltage voltage

node

node = build 18.0, "10 2 + 6 * 8 + 6 * 4 + 8 * 4 + 8 * 6 +"

print " Ohm Volt Ampere Watt Network tree"

node.report ""