一位程序员进化史 看看有你的影子吗？

论一位程序员从初级到高级再到高管晋升过程中的代码演进之路，其中，有你的影子吗？

一位 Go 程序员的进化史

初级 Go 程序员

packagefac

funcFactorial(n int) int{

res := 1

fori := 1; i <= n; i++ {

res *= i

}

returnres

}

学会使用函数的 Go 程序员

packagefac

funcFactorial(n int) int{

ifn == 0{

return1

} else{

returnFactorial(n - 1) * n

}

}

泛型 Go 程序员

packagefac

funcFactorial(n interface{}) interface{} {

v, valid := n.( int)

if!valid {

return0

}

res := 1

fori := 1; i <= v; i++ {

res *= i

}

returnres

}

学会了多线程优化的 Go 程序员

packagefac

import"sync"

funcFactorial(n int) int{

var(

left, right = 1, 1

wg sync.WaitGroup

)

wg.Add( 2)

pivot := n / 2

gofunc{

fori := 1; i < pivot; i++ {

left *= i

}

wg.Done

}

gofunc{

fori := pivot; i <= n; i++ {

right *= i

}

wg.Done

}

wg.Wait

returnleft * right

}

掌握了 Go 设计模式的程序员

packagefac

funcFactorial(n int) <- chanint{

ch := make( chanint)

gofunc{

prev := 1

fori := 1; i <= n; i++ {

v := prev * i

ch <- v

prev = v

}

close(ch)

}

returnch

}

学会使用成熟的解决方案修复 Go 语言缺点的程序员

packagefac

/**

* @seehttps://en.wikipedia.org/wiki/Factorial

*/

type IFactorial interface{

CalculateFactorial int

}

// FactorialImpl implements IFactorial.

var_ IFactorial = (*FactorialImpl)(nil)

/**

* Used to find factorial of the n.

*/

type FactorialImpl struct {

/**

* The n.

*/

n int

}

/**

* Constructor of the FactorialImpl.

*

* @paramn the n.

*/

func NewFactorial(n int) *FactorialImpl {

return&FactorialImpl{

n: n,

}

}

/**

* Gets the n to use in factorial function.

*

* @returnint.

*/

func ( this*FactorialImpl) GetN int {

returnthis.n

}

/**

* Sets the n to use in factorial function.

*

* @paramn the n.

* @returnvoid.

*/

func ( this*FactorialImpl) SetN(n int) {

this.n = n

}

/**

* Returns factorial of the n.

*

* @todoremove "if" statement. Maybe we should use a factory or somthing?

*

* @returnint.

*/

func ( this*FactorialImpl) CalculateFactorial int {

ifthis.n == 0{

return1

}

n := this.n

this.n = this.n - 1

returnthis.CalculateFactorial * n

}

高级 Go 程序员

packagefac

// Factorial returns n!.

funcFactorial(n int) int{

res := 1

fori := 1; i <= n; i++ {

res *= i

}

returnres

}

Go 语言之父 Rob Pike

packagefac

// Factorial returns n!.

funcFactorial(n int) int{

res := 1

fori := 1; i <= n; i++ {

res *= i

}

returnres

}

一个程序员的进化史

初中/高中时初入门

10PRINT"HELLO WORLD"

20END

大一

program Hello( input, output)

begin

writeln( 'Hello World')

end.

大四

(defun hello

( print

(cons 'Hello (list 'World))))

初入职场

# include

voidmain( void)

{

char*message[] = { "Hello ", "World"};

inti;

for(i = 0; i < 2; ++i)

printf( "%s", message[i]);

printf( "\n");

}

中级专家

# include

# include

classstring

{

private:

intsize;

char*ptr;

string: size( 0), ptr( newchar[ 1]) { ptr[ 0] = 0; }

string( conststring&s) : size(s.size)

{

ptr = newchar[size + 1];

strcpy(ptr, s.ptr);

}

~ string

{

delete[] ptr;

}

friendostream & operator<<(ostream &, conststring&);

string& operator=( constchar*);

};

ostream & operator<<(ostream &stream, conststring&s)

{

return(stream << s.ptr);

}

string& string:: operator=( constchar*chrs)

{

if( this!= &chrs)

{

delete[] ptr;

size = strlen(chrs);

ptr = newchar[size + 1];

strcpy(ptr, chrs);

}

return(* this);

}

intmain

{

stringstr;

str = "Hello World";

cout<< str << endl;

return( 0);

}

主程序员

[

uuid( 2573F8F4-CFEE- 101A- 9A9F- 00AA0034282 0)

]

library LHello

{

//bring in the master library

importlib( "actimp.tlb");

importlib( "actexp.tlb");

//bring in myinterfaces

#include "pshlo.idl"

[

uuid( 2573F8F5-CFEE- 101A- 9A9F- 00AA0034282 0)

]

cotype THello

{

interface IHello;

interface IPersistFile;

};

};

[

exe,

uuid( 2573F89 0-CFEE- 101A- 9A9F- 00AA0034282 0)

]

module CHelloLib

{

//some code related header files

importheader( );

importheader(  );  

importheader( );

importheader( "pshlo.h");

importheader( "shlo.hxx");

importheader( "mycls.hxx");

//needed typelibs

importlib( "actimp.tlb");

importlib( "actexp.tlb");

importlib( "thlo.tlb");

[

uuid( 2573F891-CFEE- 101A- 9A9F- 00AA0034282 0),

aggregatable

]

coclass CHello

{

cotype THello;

};

};

#include "ipfix.hxx"

extern HANDLE hEvent;

class CHello : public CHelloBase

{

public:

IPFIX(CLSID_CHello);

CHello(IUnknown *pUnk);

~CHello;

HRESULT __stdcall PrintSz(LPWSTR pwszString);

private:

static intcObjRef;

};

#include 

#include  

#include 

#include 

#include "thlo.h"

#include "pshlo.h"

#include "shlo.hxx"

#include "mycls.hxx"

intCHello::cObjRef = 0;

CHello::CHello(IUnknown *pUnk) : CHelloBase(pUnk)

{

cObjRef++;

return;

}

HRESULT __stdcall CHello::PrintSz(LPWSTR pwszString)

{

printf( "%ws

" , pwszString);

return(ResultFromScode(S_OK));

}

CHello::~CHello(void)

{

//whenthe object count goes to zero, stop the server

cObjRef--;

if( cObjRef == 0)

PulseEvent(hEvent);

return;

}

#include 

#include  

#include "pshlo.h"

#include "shlo.hxx"

#include "mycls.hxx"

HANDLE hEvent;

int_cdecl main(

intargc,

char * argv[]

) {

ULONG ulRef;

DWORD dwRegistration;

CHelloCF *pCF = new CHelloCF;

hEvent = CreateEvent(NULL, FALSE, FALSE, NULL);

//Initialize the OLE libraries

CoInitializeEx(NULL, COINIT_MULTITHREADED);

CoRegisterClassObject(CLSID_CHello, pCF, CLSCTX_LOCAL_SERVER,

REGCLS_MULTIPLEUSE, &dwRegistration);

//waiton an event to stop

WaitForSingleObject(hEvent, INFINITE);

//revoke andrelease the class object

CoRevokeClassObject(dwRegistration);

ulRef = pCF->Release;

//Tell OLE we are going away.

CoUninitialize;

return( 0); }

extern CLSID CLSID_CHello;

extern UUID LIBID_CHelloLib;

CLSID CLSID_CHello = { /* 2573F891-CFEE-101A-9A9F-00AA00342820 */

0x2573F891,

0xCFEE,

0x101A,

{ 0x9A, 0x9F, 0x00, 0xAA, 0x00, 0x34, 0x28, 0x20}

};

UUID LIBID_CHelloLib = { /* 2573F890-CFEE-101A-9A9F-00AA00342820 */

0x2573F890,

0xCFEE,

0x101A,

{ 0x9A, 0x9F, 0x00, 0xAA, 0x00, 0x34, 0x28, 0x20}

};

#include 

#include  

#include 

#include 

#include 

#include "pshlo.h"

#include "shlo.hxx"

#include "clsid.h"

int_cdecl main(

intargc,

char * argv[]

) {

HRESULT hRslt;

IHello *pHello;

ULONG ulCnt;

IMoniker * pmk;

WCHAR wcsT[_MAX_PATH];

WCHAR wcsPath[ 2* _MAX_PATH];

//get object path

wcsPath[ 0] = '\0';

wcsT[ 0] = '\0';

if( argc > 1) {

mbstowcs(wcsPath, argv[ 1], strlen(argv[ 1]) + 1);

wcsupr(wcsPath);

}

else{

fprintf(stderr, "Object path must be specified\n");

return( 1);

}

// get printstring

if(argc > 2)

mbstowcs(wcsT, argv[ 2], strlen(argv[ 2]) + 1);

else

wcscpy(wcsT, L "Hello World");

printf( "Linking to object %ws\n", wcsPath);

printf( "Text String %ws\n", wcsT);

//Initialize the OLE libraries

hRslt = CoInitializeEx(NULL, COINIT_MULTITHREADED);

if(SUCCEEDED(hRslt)) {

hRslt = CreateFileMoniker(wcsPath, &pmk);

if(SUCCEEDED(hRslt))

hRslt = BindMoniker(pmk, 0, IID_IHello, (void **)&pHello);

if(SUCCEEDED(hRslt)) {

//printa string out

pHello->PrintSz(wcsT);

Sleep( 2000);

ulCnt = pHello->Release;

}

else

printf( "Failure to connect, status: %lx", hRslt);

//Tell OLE we are going away.

CoUninitialize;

}

return( 0);

}

初级黑客

#!/usr/local/bin/perl

$msg= "Hello, world.\n";

if($#ARGV >= 0) {

while( defined($arg= shift(@ARGV))) {

$outfilename = $arg;

open(FILE, ">". $outfilename) || die"Can't write $arg: $!\n";

print(FILE $msg);

close(FILE) || die"Can't close $arg: $!\n";

}

} else{

print($msg);

}

1;

中级黑客

# include

# defineS "Hello, World\n"

main{ exit( printf(S) == strlen(S) ? 0: 1);}

资深黑客

% cc -o a. out~/src/misc/hw/hw.c

% a. out

大师级黑客

%echo"Hello, world."

初级经理

10PRINT"HELLO WORLD"

20END

中级经理

mail-s "Hello, world."bob @b12

Bob, could you please write me a program that prints "Hello, world."?

I need it by tomorrow.

^D

高级经理

% zmail jim

I need a "Hello, world."program bythisafternoon.

高管

%letter

letter: Command not found.

%mail

To: ^X ^F ^C

%helpmail

help: Command not found.

%damn!

!: Event unrecognized

%logout