Made logic and type checking simpler at certain places

- Simplified logic to set encoding in createCsvStreamReader and createCsvFileReader
- Type checking for an Array in CsvWriter.prototype.writeRecord

lib/ya-csv.js

@@ -161,11 +161,7 @@ csv.createCsvFileReader = function(path, options) {
     var readStream = fs.createReadStream(path, {
         'flags': 'r'
     });
-    if (options.encoding) {
-        readStream.setEncoding(options.encoding);
-    } else {
-        readStream.setEncoding('utf8');
-    }
+    readStream.setEncoding(options.encoding || 'utf8');
     return new CsvReader(readStream, options);
 };
 
@@ -175,8 +171,7 @@ csv.createCsvStreamReader = function(readStream, options) {
         readStream = undefined;
     }
     options = options || {};
-    if (readStream)
-       readStream.setEncoding(options.encoding ? options.encoding : 'utf8');
+    if (readStream) readStream.setEncoding(options.encoding || 'utf8');
     return new CsvReader(readStream, options);
 };
 
@@ -199,15 +194,10 @@ sys.inherits(CsvWriter, events.EventEmitter);
 
 CsvWriter.prototype.writeRecord = function(rec) {
     if (!rec) return; // ignore empty records
-    if (typeof(rec) !== 'object') {
-        throw new Error("CsvWriter.writeRecord takes an array as an argument");
-    }
-    if (rec.length || rec.length === 0) { // array
-        _writeArray(this, rec);
-    } else {          // hash
-        throw new Error("CsvWriter.writeRecord takes an array as an argument, "
-                      + "hashes are not supported.");
+    if (!Array.isArray(rec)) {
+        throw new Error("CsvWriter.writeRecord only takes an array as an argument");
     }
+    _writeArray(this, rec);
 };
 
 function _writeArray(writer, arr) {