高级程序员进化史 / 四六文摘

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

package fac
func Factorial(n int) int {
res := 1
for i := 1; i <= n; i++ {
res *= i
}
return res
}

学会使用函数的 Go 程序员

package fac
func Factorial(n int) int {
if n == 0 {
return 1
} else {
return Factorial(n - 1) * n
}
}

泛型 Go 程序员

package fac
func Factorial(n interface{}) interface{} {
v, valid := n.(int)
if !valid {
return 0
}
res := 1
for i := 1; i <= v; i++ {
res *= i
}
return res
}

学会了多线程优化的 Go 程序员

package fac
import 'sync'
func Factorial(n int) int {
var (
left, right = 1, 1
wg sync.WaitGroup
)
wg.Add(2)
pivot := n / 2
go func() {
for i := 1; i < pivot; i++ {
left *= i
}
wg.Done()
}()
go func() {
for i := pivot; i <= n; i++ {
right *= i
}
wg.Done()
}()
wg.Wait()
return left * right
}

掌握了 Go 设计模式的程序员

package fac
func Factorial(n int) <-chan int {
ch := make(chan int)
go func() {
prev := 1
for i := 1; i <= n; i++ {
v := prev * i
ch <- v
prev = v
}
close(ch)
}()
return ch
}

学会使用成熟的解决方案修复 Go 语言缺点的程序员

package fac
/**
* @see https://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.
*
* @param n the n.
*/
func NewFactorial(n int) *FactorialImpl {
return &FactorialImpl{
n: n,
}
}
/**
* Gets the n to use in factorial function.
*
* @return int.
*/
func (this *FactorialImpl) GetN() int {
return this.n
}
/**
* Sets the n to use in factorial function.
*
* @param n the n.
* @return void.
*/
func (this *FactorialImpl) SetN(n int) {
this.n = n
}
/**
* Returns factorial of the n.
*
* @todo remove 'if' statement. Maybe we should use a factory or somthing?
*
* @return int.
*/
func (this *FactorialImpl) CalculateFactorial() int {
if this.n == 0 {
return 1
}
n := this.n
this.n = this.n - 1
return this.CalculateFactorial() * n
}

高级 Go 程序员

package fac
// Factorial returns n!.
func Factorial(n int) int {
res := 1
for i := 1; i <= n; i++ {
res *= i
}
return res
}

Go 语言之父 Rob Pike

package fac
// Factorial returns n!.
func Factorial(n int) int {
res := 1
for i := 1; i <= n; i++ {
res *= i
}
return res
}

一个程序员的进化史

初中/高中时初入门

10 PRINT 'HELLO WORLD'
20 END

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 <stdio.h>
void main(void)
{
char *message[] = {'Hello ', 'World'};
int i;
for(i = 0; i < 2; ++i)
printf('%s', message[i]);
printf('\n');
}

中级专家

#include <iostream.h>
#include <string.h>
class string
{
private:
int size;
char *ptr;
string() : size(0), ptr(new char[1]) { ptr[0] = 0; }
string(const string &s) : size(s.size)
{
ptr = new char[size + 1];
strcpy(ptr, s.ptr);
}
~string()
{
delete [] ptr;
}
friend ostream &operator <<(ostream &, const string &);
string &operator=(const char *);
};
ostream &operator<<(ostream &stream, const string &s)
{
return(stream << s.ptr);
}
string &string::operator=(const char *chrs)
{
if (this != &chrs)
{
delete [] ptr;
size = strlen(chrs);
ptr = new char[size + 1];
strcpy(ptr, chrs);
}
return(*this);
}
int main()
{
string str;
str = 'Hello World';
cout << str << endl;
return(0);
}

主程序员

[
uuid(2573F8F4-CFEE-101A-9A9F-00AA00342820)
]
library LHello
{
// bring in the master library
importlib('actimp.tlb');
importlib('actexp.tlb');
// bring in my interfaces
#include 'pshlo.idl'
[
uuid(2573F8F5-CFEE-101A-9A9F-00AA00342820)
]
cotype THello
{
interface IHello;
interface IPersistFile;
};
};
[
exe,
uuid(2573F890-CFEE-101A-9A9F-00AA00342820)
]
module CHelloLib
{
// some code related header files
importheader(<windows.h>);
importheader(<ole2.h>);
importheader(<except.hxx>);
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-00AA00342820),
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 int cObjRef;
};
#include <windows.h>
#include <ole2.h>
#include <stdio.h>
#include <stdlib.h>
#include 'thlo.h'
#include 'pshlo.h'
#include 'shlo.hxx'
#include 'mycls.hxx'
int CHello::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)
{
// when the object count goes to zero, stop the server
cObjRef--;
if( cObjRef == 0 )
PulseEvent(hEvent);
return;
}
#include <windows.h>
#include <ole2.h>
#include 'pshlo.h'
#include 'shlo.hxx'
#include 'mycls.hxx'
HANDLE hEvent;
int _cdecl main(
int argc,
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);
// wait on an event to stop
WaitForSingleObject(hEvent, INFINITE);
// revoke and release 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 <windows.h>
#include <ole2.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include 'pshlo.h'
#include 'shlo.hxx'
#include 'clsid.h'
int _cdecl main(
int argc,
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 print string
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)) {
// print a 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 <stdio.h>
#define S '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

10 PRINT 'HELLO WORLD'
20 END

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 by this afternoon.

高管

% letter
letter: Command not found.
% mail
To: ^X ^F ^C
% help mail
help: Command not found.
% damn!
!: Event unrecognized
% logout

原文地址：

https://github.com/SuperPaintman/the-evolution-of-a-go-programmer

https://www.ariel.com.au/jokes/The_Evolution_of_a_Programmer.html

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高级程序员进化史

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