Refactor code

Author: fateslayer

lib/index.js

@@ -107,10 +107,8 @@ class Parser extends Transform {
     options.delimiter = options.delimiter.map(function(del){
       if(del === undefined || del === null || del === false){
         return Buffer.from(',')
-      }else if(typeof del === 'string' && del.length !== 0){
+      }else if((typeof del === 'string' || Buffer.isBuffer(del)) && del.length !== 0){
         return Buffer.from(del)
-      }else if(Buffer.isBuffer(del) && del.length !== 0){
-        return del
       }
       throw new CsvError('CSV_INVALID_OPTION_DELIMITER', [
         'Invalid option delimiter:',
@@ -932,7 +930,7 @@ class Parser extends Transform {
   __isDelimiter(chr, buf, pos){
     const {delimiter} = this.options
     loop1: for(let i = 0; i < delimiter.length; i++){
-      const del = delimiter[i];
+      const del = delimiter[i]
       if(del[0] === chr){
         for(let j = 1; j < del.length; j++){
           if(del[j] !== buf[pos+j]) continue loop1