September 2017 Update

Task/Arithmetic-Complex/CoffeeScript/arithmetic-complex-1.coffee

@@ -1,60 +0,0 @@
-# create an immutable Complex type
-class Complex
-  constructor: (@r=0, @i=0) ->
-    @magnitude = @r*@r + @i*@i
-
-  plus: (c2) ->
-    new Complex(
-      @r + c2.r,
-      @i + c2.i
-    )
-
-  times: (c2) ->
-    new Complex(
-      @r*c2.r - @i*c2.i,
-      @r*c2.i + @i*c2.r
-    )
-
-  negation: ->
-    new Complex(
-      -1 * @r,
-      -1 * @i
-    )
-
-  inverse: ->
-    throw Error "no inverse" if @magnitude is 0
-    new Complex(
-      @r / @magnitude,
-      -1 * @i / @magnitude
-    )
-
-  toString: ->
-    return "#{@r}" if @i == 0
-    return "#{@i}i" if @r == 0
-    if @i > 0
-      "#{@r} + #{@i}i"
-    else
-      "#{@r} - #{-1 * @i}i"
-
-# test
-do ->
-  a = new Complex(5, 3)
-  b = new Complex(4, -3)
-
-  sum = a.plus b
-  console.log "(#{a}) + (#{b}) = #{sum}"
-
-  product = a.times b
-  console.log "(#{a}) * (#{b}) = #{product}"
-
-  negation = b.negation()
-  console.log "-1 * (#{b}) = #{negation}"
-
-  diff = a.plus negation
-  console.log "(#{a}) - (#{b}) = #{diff}"
-
-  inverse = b.inverse()
-  console.log "1 / (#{b}) = #{inverse}"
-
-  quotient = product.times inverse
-  console.log "(#{product}) / (#{b}) = #{quotient}"

Task/Arithmetic-Complex/CoffeeScript/arithmetic-complex-2.coffee

@@ -1,7 +0,0 @@
-> coffee complex.coffee
-(5 + 3i) + (4 - 3i) = 9
-(5 + 3i) * (4 - 3i) = 29 - 3i
--1 * (4 - 3i) = -4 + 3i
-(5 + 3i) - (4 - 3i) = 1 + 6i
-1 / (4 - 3i) = 0.16 + 0.12i
-(29 - 3i) / (4 - 3i) = 5 + 3i