Short script written in CoffeeScript which converts a string containing roman numerals to an integer

roman-numerals-converter.coffee

### Convert string of roman numerals to an integer ###

convertSingleChar = (romanNumeral) ->
    
    switch romanNumeral
        when "I" then 1
        when "V" then 5
        when "X" then 10
        when "L" then 50
        when "C" then 100
        when "D" then 500
        when "M" then 1000
        
nextIntBigger = (array, index) ->
    
    if index + 1 is array.length then return false
    return array[index] < array[index + 1]

romanToInt = (romanNumerals) ->

    intArr = []
    intArr.push convertSingleChar romanNumeral for romanNumeral in romanNumerals
    
    total = subtractTotal = 0
    for int, i in intArr
        if nextIntBigger intArr, i then subtractTotal += int else total += int
    
    return total - subtractTotal

console.log romanToInt "LXXXIX" # 89
console.log romanToInt "XCIV"   # 94
console.log romanToInt "DCCC"   # 800
console.log romanToInt "CM"     # 900