[GitHub] cordova-plugin-file-transfer pull request: Update index.md

[purplecabbage]

Github user purplecabbage commented on the pull request:

    
https://github.com/apache/cordova-plugin-file-transfer/pull/33#issuecomment-46715601
  
    Ideally no-one outside of the plugin developer uses the numeric values.
    
    Sample code should demonstrate this:
    ```
    function errorCodeToMessage(errCode) {
        if(errCode == FileTransferError.FILE_NOT_FOUND_ERR) {
            return "Error: File Not Found";
        }
        ...
    }



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