buffer: simplify code

This refactors some code for simplicity. It also removes a call
indirection used in the buffers custom inspect function.
PR-URL: #25151
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Masashi Hirano <shisama07@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

Author: BridgeAR

lib/buffer.js

@@ -298,11 +298,13 @@ Buffer.allocUnsafeSlow = function allocUnsafeSlow(size) {
 // If --zero-fill-buffers command line argument is set, a zero-filled
 // buffer is returned.
 functionSlowBuffer(length){
+constlen=+length;
 // eslint-disable-next-line eqeqeq
-if(+length!=length)
+if(len!=length)
 length=0;
-assertSize(+length);
-returncreateUnsafeBuffer(+length);
+else
+assertSize(len);
+returncreateUnsafeBuffer(len);
 }
 
 Object.setPrototypeOf(SlowBuffer.prototype,Uint8Array.prototype);
@@ -319,9 +321,8 @@ function allocate(size) {
 poolOffset+=size;
 alignPool();
 returnb;
-}else{
-returncreateUnsafeBuffer(size);
 }
+returncreateUnsafeBuffer(size);
 }
 
 functionfromString(string,encoding){
@@ -639,21 +640,18 @@ Buffer.prototype.toString = function toString(encoding, start, end) {
 }
 
 constlen=this.length;
-if(len===0)
-return'';
 
-if(!start||start<0)
+if(start<=0)
 start=0;
 elseif(start>=len)
 return'';
+else
+start|=0;
 
 if(end===undefined||end>len)
 end=len;
-elseif(end<=0)
-return'';
-
-start|=0;
-end|=0;
+else
+end|=0;
 
 if(end<=start)
 return'';
@@ -672,10 +670,10 @@ Buffer.prototype.equals = function equals(otherBuffer) {
 };
 
 // Override how buffers are presented by util.inspect().
-Buffer.prototype[customInspectSymbol]=functioninspect(){
-varstr='';
-varmax=exports.INSPECT_MAX_BYTES;
-str=this.toString('hex',0,max).replace(/(.{2})/g,'$1 ').trim();
+Buffer.prototype[customInspectSymbol]=functioninspect(recurseTimes,ctx){
+constmax=exports.INSPECT_MAX_BYTES;
+constactualMax=Math.min(max,this.length);
+letstr=this.hexSlice(0,actualMax).replace(/(.{2})/g,'$1 ').trim();
 constremaining=this.length-max;
 if(remaining>0)
 str+=` ... ${remaining} more byte${remaining>1 ? 's' : ''}`;
@@ -977,9 +975,8 @@ Buffer.prototype.toJSON = function toJSON() {
 for(vari=0;i<this.length;++i)
 data[i]=this[i];
 return{type: 'Buffer', data };
-}else{
-return{type: 'Buffer',data: []};
 }
+return{type: 'Buffer',data: []};
 };
 
 functionadjustOffset(offset,length){