fs: use arrow functions instead of .bind and self

PR-URL: #17137 Reviewed-By: Michaël Zasso <[email protected]> Reviewed-By: Gireesh Punathil <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: James M Snell <[email protected]>

Author: starkwang

lib/fs.js

@@ -2026,30 +2026,27 @@ ReadStream.prototype._read = function(n){
 returnthis.push(null);
 
 // the actual read.
-varself=this;
-fs.read(this.fd,pool,pool.used,toRead,this.pos,onread);
-
-// move the pool positions, and internal position for reading.
-if(this.pos!==undefined)
-this.pos+=toRead;
-pool.used+=toRead;
-
-functiononread(er,bytesRead){
+fs.read(this.fd,pool,pool.used,toRead,this.pos,(er,bytesRead)=>{
 if(er){
-if(self.autoClose){
-self.destroy();
+if(this.autoClose){
+this.destroy();
 }
-self.emit('error',er);
+this.emit('error',er);
 }else{
 varb=null;
 if(bytesRead>0){
-self.bytesRead+=bytesRead;
+this.bytesRead+=bytesRead;
 b=thisPool.slice(start,start+bytesRead);
 }
 
-self.push(b);
+this.push(b);
 }
-}
+});
+
+// move the pool positions, and internal position for reading.
+if(this.pos!==undefined)
+this.pos+=toRead;
+pool.used+=toRead;
 };
 
 
@@ -2143,7 +2140,7 @@ fs.FileWriteStream = fs.WriteStream; // support the legacy name
 
 
 WriteStream.prototype.open=function(){
-fs.open(this.path,this.flags,this.mode,function(er,fd){
+fs.open(this.path,this.flags,this.mode,(er,fd)=>{
 if(er){
 if(this.autoClose){
 this.destroy();
@@ -2154,7 +2151,7 @@ WriteStream.prototype.open = function(){
 
 this.fd=fd;
 this.emit('open',fd);
-}.bind(this));
+});
 };
 
 
@@ -2168,15 +2165,14 @@ WriteStream.prototype._write = function(data, encoding, cb){
 });
 }
 
-varself=this;
-fs.write(this.fd,data,0,data.length,this.pos,function(er,bytes){
+fs.write(this.fd,data,0,data.length,this.pos,(er,bytes)=>{
 if(er){
-if(self.autoClose){
-self.destroy();
+if(this.autoClose){
+this.destroy();
 }
 returncb(er);
 }
-self.bytesWritten+=bytes;
+this.bytesWritten+=bytes;
 cb();
 });