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Compression:
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Contents
module.exports = class WordProblem
BINARY_OPERATORS:
'plus': (l, r) -> l + r
'minus': (l, r) -> l - r
'multiplied by': (l, r) -> l * r
'divided by': (l, r) -> l / r
ERROR:
tooComplicated: new Error("I don't understand the question")
constructor: (@question = '') ->
@matches = @question.match @pattern()
operators: ->
Object.keys @BINARY_OPERATORS
pattern: ->
operations = " (#{@operators().join('|')}) "
/// (?:
what[\x20]is[\x20] # what is
([-+]?[\d]+) # +/- number
#{operations} # operator (plus, minus, etc.)
([-+]?[\d]+) # +/- number
(?: # optional extra group
#{operations} # operator (plus, minus, etc.)
([-+]?[\d]+) # +/- number
)? # end optional extra group
) ///i
tooComplicated: -> not @matches
answer: =>
throw @ERROR.tooComplicated if @tooComplicated()
@evaluate()
evaluate: ->
out = 0
m = @matches
out = @operate(m[2], m[1], m[3]) if m[1]? && m[2]? && m[3]?
out = @operate(m[4], out, m[5]) if m[4]? && m[5]?
out
operate: (operation, l, r) ->
fn = @BINARY_OPERATORS[operation] || -> 0
fn Number(l), Number(r)
Version data entries
396 entries across 396 versions & 1 rubygems