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February 6, 2017 14:21
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| add = (a, b) -> | |
| strA = "#{a}" | |
| strB = "#{b}" | |
| lenA = strA.length | |
| lenB = strB.length | |
| # if length is different, prepend the shorter one with 0 | |
| if lenA < lenB | |
| strA = '0' + strA for i in [0...(lenB - lenA)] | |
| else | |
| strB = '0' + strB for i in [0...(lenA - lenB)] | |
| strResult = '' | |
| carryDigit = 0 | |
| for i in [(lenA - 1)..0] by -1 | |
| sumDigit = Number(strA[i]) + Number(strB[i]) + carryDigit | |
| carryDigit = (if sumDigit >= 10 then 1 else 0) | |
| if carryDigit is 1 then sumDigit -= 10 | |
| strResult = "#{sumDigit}" + strResult | |
| if carryDigit isnt 0 then strResult = "#{carryDigit}" + strResult | |
| strResult |
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