diff --git a/.gitignore b/.gitignore
index 2b3deaa..3c91699 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,6 +3,7 @@ Thumbs.db
 node_modules/
 *.swp
 *.swo
+.idea/
 
 # intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
 .grunt
diff --git a/bin/csvtojson.js b/bin/csvtojson.js
index 1e79547..0bff307 100644
--- a/bin/csvtojson.js
+++ b/bin/csvtojson.js
@@ -43,8 +43,8 @@ function csvtojson() {
   }
   function stringToRegExp(str) {
     var lastSlash = str.lastIndexOf("/");
-    var source = str.substring(1, lastSlash);
-    var flag = str.substring(lastSlash + 1);
+    var source = str.substr(1, lastSlash);
+    var flag = str.substr(lastSlash + 1);
     return new RegExp(source,flag);
   }
   function parse() {
diff --git a/src/Converter.ts b/src/Converter.ts
index 744b945..ea866ec 100644
--- a/src/Converter.ts
+++ b/src/Converter.ts
@@ -2,19 +2,10 @@ import { Transform, TransformOptions, Readable } from "stream";
 import { CSVParseParam, mergeParams } from "./Parameters";
 import { ParseRuntime, initParseRuntime } from "./ParseRuntime";
 import P from "bluebird";
-import { stringToLines } from "./fileline";
-import { map } from "lodash/map";
-import { RowSplit, RowSplitResult } from "./rowSplit";
-import getEol from "./getEol";
-import lineToJson, { JSONResult } from "./lineToJson";
-import { Processor, ProcessLineResult } from "./Processor";
-// import { ProcessorFork } from "./ProcessFork";
+import { Processor } from "./Processor";
 import { ProcessorLocal } from "./ProcessorLocal";
 import { Result } from "./Result";
 import CSVError from "./CSVError";
-import { bufFromString } from "./util";
-
-
 
 export class Converter extends Transform implements PromiseLike<any[]> {
   preRawData(onRawData: PreRawDataCallback): Converter {
@@ -38,12 +29,6 @@ export class Converter extends Transform implements PromiseLike<any[]> {
   }
   fromFile(filePath: string, options?: string | CreateReadStreamOption | undefined): Converter {
     const fs = require("fs");
-    // var rs = null;
-    // this.wrapCallback(cb, function () {
-    //   if (rs && rs.destroy) {
-    //     rs.destroy();
-    //   }
-    // });
     fs.exists(filePath, (exist) => {
       if (exist) {
         const rs = fs.createReadStream(filePath, options);
@@ -66,7 +51,7 @@ export class Converter extends Transform implements PromiseLike<any[]> {
       if (idx >= csvString.length) {
         this.push(null);
       } else {
-        const str = csvString.substr(idx, size);
+        const str = csvString.substring(idx, idx + size);
         this.push(str);
         idx += size;
       }
@@ -108,14 +93,8 @@ export class Converter extends Transform implements PromiseLike<any[]> {
     this.params = mergeParams(param);
     this.runtime = initParseRuntime(this);
     this.result = new Result(this);
-    // if (this.params.fork) {
-    //   this.processor = new ProcessorFork(this);
-    // } else {
     this.processor = new ProcessorLocal(this);
-    // }
     this.once("error", (err: any) => {
-      // console.log("BBB");
-      //wait for next cycle to emit the errors.
       setImmediate(() => {
         this.result.processError(err);
         this.emit("done", err);
diff --git a/src/lineToJson.ts b/src/lineToJson.ts
index b89ee81..94709d4 100644
--- a/src/lineToJson.ts
+++ b/src/lineToJson.ts
@@ -2,9 +2,8 @@ import { Converter } from "./Converter";
 import CSVError from "./CSVError";
 import { CellParser, ColumnParam } from "./Parameters";
 import set from "lodash/set";
-import { ParseRuntime } from "./ParseRuntime";
 
-var numReg = /^[-+]?[0-9]*\.?[0-9]+([eE][-+]?[0-9]+)?$/;
+const numReg = /^[-+]?[0-9]*\.?[0-9]+([eE][-+]?[0-9]+)?$/;
 
 export default function (csvRows: string[][], conv: Converter): JSONResult[] {
   const res: JSONResult[] = [];
@@ -58,10 +57,6 @@ function convertRowToJson(row: string[], headRow: string[], conv: Converter): {
         setPath(resultRow, head, convRes, conv,i);
       }
     } else {
-      // var flag = getFlag(head, i, param);
-      // if (flag === 'omit') {
-      //   continue;
-      // }
       if (conv.parseParam.checkType) {
         const convertFunc = checkType(item, head, i, conv);
         item = convertFunc(item);
@@ -193,12 +188,8 @@ function dynamicType(item) {
 }
 
 function booleanType(item) {
-  var trimed = item.trim();
-  if (trimed.length === 5 && trimed.toLowerCase() === "false") {
-    return false;
-  } else {
-    return true;
-  }
+  const trimmed = item.trim();
+  return !(trimmed.length === 5 && trimmed.toLowerCase() === "false");
 }
 
 function jsonType(item) {
diff --git a/src/rowSplit.ts b/src/rowSplit.ts
index b6c6502..711fc3b 100644
--- a/src/rowSplit.ts
+++ b/src/rowSplit.ts
@@ -69,7 +69,7 @@ export class RowSplit {
         } else if (this.isQuoteOpen(e)) { //quote open
           e = e.substr(1);
           if (this.isQuoteClose(e)) { //quote close
-            e = e.substring(0, e.lastIndexOf(quote));
+            e = e.substr(0, e.lastIndexOf(quote));
             e = this.escapeQuote(e);
             row.push(e);
             continue;
diff --git a/v2/lineToJson.js b/v2/lineToJson.js
index 119f329..cfad7e8 100644
--- a/v2/lineToJson.js
+++ b/v2/lineToJson.js
@@ -17,7 +17,6 @@ function default_1(csvRows, conv) {
     return res;
 }
 exports.default = default_1;
-;
 function processRow(row, conv, index) {
     if (conv.parseParam.checkColumn && conv.parseRuntime.headers && row.length !== conv.parseRuntime.headers.length) {
         throw (CSVError_1.default.column_mismatched(conv.parseRuntime.parsedLineNumber + index));