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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 http://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
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);
//
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);
//
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);} % cc -o a.out ~/src/misc/hw/hw.c
% a.out大师级黑客
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：
4月23日晚8点，欢迎来到CSDN直播间，与资深行业专家雷明老师一起探讨机器学习所必须掌握的数学知识。
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发表于 2021-4-26 21:59:01
