我写的代码与领导写的代码，有何区别？ 作者 | Patrick Jordan、SuperPaintman 策划 | 田晓旭 在程序员圈子有很多有趣的等级划分规则，例如格子衬衫是程序员不能放弃的自尊心，衬衫上的格子数目越多，等级越高，技术越厉害；秃顶是尊贵身份的象征，发际线越高，等级越高，经验越丰富；而代码则是一个轮回，随着等级的变化，你会发现你写的代码又回到了“最初的美好”！（编者小贴士：本文仅供娱乐，博君一笑） 首先，我们先来看看不同级别的程序员写的代码都是怎样的？在这里我们把程序员从学生到 CEO 共分成了 14 个等级，快来看看，你和你领导写的代码，差在哪里？ 初高中同学写的代码 10 PRINT "HELLO WORLD" 20 END 大学一年级同学写的代码 program Hello(input, output) begin writeln('Hello World') end. 大学四年级同学写的代码 (defun hello (print (cons 'Hello (list 'World)))) 初入职场菜鸟程序员写的代码 #include stdio.h void main(void) { char *message[] = {"Hello ", "World"}; int i; for(i = 0; i ++i) printf("%s", message[i]); printf("\n"); } 工作多年的资深程序员写的代码 #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); } 骨灰级程序员写的代码 [ 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, if(SUCCEEDED(hRslt)) hRslt = BindMoniker(pmk, 0, IID_IHello, (void **) 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); } 菜鸟黑客写的代码 #!/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; 有经验的黑客写的代码 #include stdio.h #define S "Hello, World\n" main(){exit(printf(S) == strlen(S) ? 0 : 1);} 资深黑客写的代码 % cc -o a.out ~/src/misc/hw/hw.c % a.out 骨灰级黑客大师写的代码 % echo "Hello, world." 新任的初级经理写的代码 10 PRINT "HELLO WORLD" 20 END 中级经理写的代码 mail -s "Hello, world." bob@b12 Bob, could you please write me a program that prints "Hello, world."? I need it by tomorrow. ^D 高级经理写的代码 % zmail jim I need a "Hello, world." program by this afternoon. 公司 CEO 写的代码 % letter letter: Command not found. % mail To: ^X ^F ^C % help mail help: Command not found. % damn! !: Event unrecognized % logout 看完不同级别程序员的代码之后，你是不是也有所触动呢？上面的例子可能有点宽泛，接下来我们就集中在 Go 语言，看看不同级别的程序员都是怎么样写代码的？ 初级 Go 语言程序员写的代码 package fac func Factorial(n int) int { res := 1 for i := 1; i i++ { res *= i } return res } 功能性 Go 语言程序员写的代码 package fac func Factorial(n int) int { if n == 0 { return 1 } else { return Factorial(n - 1) * n } } 通用 Go 语言程序员写的代码 package fac func Factorial(n interface{}) interface{} { v, valid := n.(int) if !valid { return 0 } res := 1 for i := 1; i i++ { res *= i } return res } 多线程优化的 Go 语言程序员写的代码 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 i++ { right *= i } wg.Done() }() wg.Wait() return left * right } 利用 Go 设计模式的程序员写的代码 package fac func Factorial(n int) -chan int { ch := make(chan int) go func() { prev := 1 for i := 1; i i++ { v := prev * i ch - v prev = v } close(ch) }() return ch } 利用成熟的 Go 解决方案写的代码 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 语言程序员写的代码 package fac // Factorial returns !n. func Factorial(n int) int { res := 1 for i := 1; i i++ { res *= i } return res } 类似于 Rob Pike 宗师级程序员写的代码 package fac // Factorial returns !n. func Factorial(n int) int { res := 1 for i := 1; i i++ { res *= i } return res } 参考链接： https://www.ariel.com.au/jokes/The_Evolution_of_a_Programmer.html https://github.com/SuperPaintman/the-evolution-of-a-go-programmer#the-evolution-of-a-go-programmer 你也「在看」吗？?? 阅读原文