\u5927\u5bb6\u597d\uff0c\u6211\u662f\u714e\u9c7c\u3002<\/p>\n
\u524d\u6587\u7ed9\u5927\u5bb6\u5206\u4eab\u4e86\u300a10+ \u6761 Go \u5b98\u65b9\u8c1a\u8bed\uff0c\u4f60\u77e5\u9053\u51e0\u6761\uff1f<\/a>\u300b\uff0c\u4eca\u5929\u8fdb\u4e00\u6b65\u8bb2\u8bb2\u7b2c 5 \u6761\u8c1a\u8bed Make the zero value useful\uff08\u8ba9\u96f6\u503c\u53d8\u5f97\u6709\u7528\uff09\uff0c\u770b\u770b\u91cc\u9762\u60f3\u7684\u662f\u4ec0\u4e48\u610f\u601d\u3002<\/p>\n Go \u8bed\u8a00\u4e2d\u6709\u4e00\u4e2a\u6709\u4e9b\u7279\u6b8a\u7684\u6982\u5ff5\uff0c\u53eb\u505a\u96f6\u503c\u3002\u8bb8\u591a\u8f6c\u8bed\u8a00\u7684\u540c\u5b66\u7ecf\u5e38\u4f1a\u5f04\u6df7\u6dc6\uff0c\u4e00\u5f00\u59cb\u4f1a\u4e0d\u9002\u5e94\u3002<\/p>\n \u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n \u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n \u8fd9\u4f1a\u5bfc\u81f4\u5927\u5bb6\u5728\u5b9a\u4e49\u5404\u79cd\u6570\u636e\u5e93\u5b57\u6bb5\u65f6\u6bd4\u8f83\u7ea0\u7ed3\uff0c\u53c8\u4f1a\u8bf4 Go \u8fd9\u96f6\u503c\uff0c\u4f8b\u5982\uff1a\u6574\u5f62\u7684\u96f6\u503c 0\uff0c\u8ddf\u6570\u636e\u5e93\u91cc\u7684 0 \u679a\u4e3e\u503c\u51b2\u7a81\u3002\u53c8\u6216\u662f\u505a\u5165\u53c2\u5224\u65ad\u65f6\u600e\u4e48\u533a\u522b\u5f00\uff1f<\/p>\n \u4e00\u65f6\u534a\u4f1a\u60f3\u4e0d\u660e\u767d\uff0c\u4e3a\u4ec0\u4e48 Go \u8981\u5b9a\u4e49\u8fd9\u4e2a\u96f6\u503c\u6765\u589e\u52a0\u590d\u6742\u5ea6\uff1f<\/p>\n Go \u6838\u5fc3\u56e2\u961f\u7684 @Dave Cheney \u5728\u300aWhat is the zero value, and why is it useful?<\/a>\u300b\u4e2d\u5bf9\u96f6\u503c\u8fdb\u884c\u4e86\u8be6\u7ec6\u7684\u9610\u91ca\u3002<\/p>\n \u5c06\u4e00\u4e2a\u503c\u8bbe\u7f6e\u4e3a\u5df2\u77e5\u9ed8\u8ba4\u503c\u7684\u7279\u6027\uff0c\u5bf9\u4e8e\u7a0b\u5e8f\u7684\u5b89\u5168\u6027\u548c\u6b63\u786e\u6027\u975e\u5e38\u91cd\u8981\u3002\u53ef\u4ee5\u4f7f\u4f60\u7684 Go \u7a0b\u5e8f\u66f4\u52a0\u7b80\u5355\u548c\u7d27\u51d1\u3002\u8fd9\u5c31\u662f Go \u7a0b\u5e8f\u5458\u5e38\u8bf4\u7684 “\u7ed9\u4f60\u7684\u7ed3\u6784\u4e00\u4e2a\u6709\u7528\u7684\u96f6\u503c”\u3002<\/p><\/blockquote>\n \u4ee5\u4e0b\u662f Go \u5b98\u65b9\u7ed9\u51fa\u7684\u51e0\u4e2a\u96f6\u503c\u7684\u4f8b\u5b50\uff0c\u975e\u5e38\u5177\u6709\u4ee3\u8868\u6027\u3002\u5206\u522b\u662f\uff1a<\/p>\n sync.Mutex \u88ab\u8bbe\u8ba1\u4e3a\u65e0\u9700\u663e\u5f0f\u521d\u59cb\u5316\u5c31\u53ef\u4ee5\u4f7f\u7528<\/strong>\uff0c\u53ef\u4ee5\u5b9e\u73b0\u8fd9\u4e2a\u529f\u80fd\u7684\u539f\u56e0\u662f sync.Mutex \u5305 \u542b\u4e24\u4e2a\u672a\u5bfc\u51fa\u7684\u6574\u6570\u5b57\u6bb5\u3002<\/p>\n \u7528\u5927\u767d\u8bdd\u8bb2\uff0c\u5c31\u662f\u7531\u4e8e\u96f6\u503c\u7684\u5b58\u5728\uff0c\u53ea\u8981\u58f0\u660e\u4e86 sync.Mutex\uff0c\u8fd9\u4e9b\u5b57\u6bb5\u5c31\u4f1a\u88ab\u8bbe\u7f6e\u4e3a 0\uff08\u503c\u4f1a\u88ab\u521d\u59cb\u5316\uff09\u3002<\/p>\n \u56e0\u6b64\u53ef\u4ee5\u65e0\u9700\u663e\u5f0f\u521d\u59cb\u5316\u5c31\u53ef\u4ee5\u5f00\u7bb1\u5373\u7528<\/strong>\u3002<\/p>\n \u5982\u4e0b\u4ee3\u7801\uff1a<\/p>\n \u56e0\u4e3a\u6709\u96f6\u503c\u7684\u5b58\u5728\uff0cbytes.Buffer \u5728\u8fdb\u884c\u5199\u5165\u6216\u8bfb\u53d6\u7684\u64cd\u4f5c\u65f6\uff0c\u90fd\u4e0d\u9700\u8981\u4eba\u4e3a\u7684\u8fdb\u884c\u660e\u786e\u7684\u521d\u59cb\u5316\u3002\u4e5f\u80fd\u505a\u5230\u5f88\u597d\u7684\u5f00\u7bb1\u5373\u7528\u3002<\/p>\n \u5982\u4e0b\u4ee3\u7801\uff1a<\/p>\n \u6ce8\uff1aio.Copy \u9700\u8981\u4e00\u4e2a io.Reader \u4f5c\u4e3a\u5b83\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\uff0c\u6240\u4ee5\u6211\u4eec\u9700\u8981\u4f20\u9012\u4e00\u4e2a\u6307\u5411 b \u7684\u6307\u9488\u3002<\/p>\n \u5728 slices \u7684\u5b9a\u4e49\u4e2d\uff0c\u5b83\u7684\u96f6\u503c\u662f nil\u3002\u8fd9\u610f\u5473\u7740\u4f60\u4e0d\u9700\u8981\u663e\u5f0f\u5b9a\u4e49\u4e00\u4e2a slices\uff0c\u53ea\u9700\u8981\u76f4\u63a5\u58f0\u660e\u5b83\uff0c\u5c31\u53ef\u4ee5\u4f7f\u7528\u4e86\u3002<\/p>\n \u5982\u4e0b<\/p>\n \u4f60\u53ef\u4ee5\u5728\u6709 nil \u503c\u7684\u7c7b\u578b\u4e0a\u8c03\u7528\u65b9\u6cd5\uff0c\u8fd9\u4e5f\u662f\u96f6\u503c\u4f5c\u4e3a\u7f3a\u7701\u503c\u7684\u4f5c\u7528\u4e4b\u4e00\u3002<\/p>\n \u8fd9\u4e2a\u573a\u666f\uff0c\u751a\u81f3\u4e00\u5ea6\u8ba9\u8bb8\u591a Go \u7a0b\u5e8f\u5458\u4ee5\u4e3a\u662f BUG\uff0c\u6211\u8fd8\u4e13\u95e8\u5199\u8fc7\u6587\u7ae0\u3002\u8fd9\u662f\u53ef\u884c\uff0c\u5176\u5b9e\u90fd\u662f\u96f6\u503c\u7684\u5ef6\u4f38\u51fa\u6765\u7684\u7528\u6cd5\u3002<\/p>\n \u5982\u4e0b\u4ee3\u7801\uff1a<\/p>\n \u96f6\u503c\uff0c\u5728 Go \u91cc\u867d\u7136\u662f\u4e00\u4e2a\u7f3a\u7701\u503c\u3002\u4f46\u4f60\u5b83\u672c\u8d28\u4e0a\u4e0d\u4ec5\u4ec5\u662f\u4e00\u4e2a\u7f3a\u7701\uff0c\u5b83\u8fd8\u4e3a\u6b64\u5728\u8bb8\u591a\u7a0b\u5e8f\u91cc\u7684\u5e94\u7528\u573a\u666f\u63d0\u4f9b\u4e86\u4e0d\u5c11\u7684\u4fbf\u6377\u7279\u6027\uff0c\u751a\u81f3\u662f\u9690\u6666\u7684\u529f\u80fd\u3002<\/p>\n \u5e0c\u671b\u5bf9\u4f60\u5bf9\u96f6\u503c\u7684\u7406\u89e3\u6709\u8fdb\u4e00\u6b65\u7684\u5e2e\u52a9\uff01<\/p>\n\u80cc\u666f<\/h2>\n
func main() {\n var i int\n var f float64\n var b bool\n var s string\n fmt.Printf("%v %v %v %q\/n", i, f, b, s)\n}<\/code><\/pre>\n0 0 false ""<\/code><\/pre>\n\u6709\u4ec0\u4e48\u7528<\/h2>\n
\u5b98\u65b9\u8be0\u91ca<\/h3>\n
\u5b98\u65b9\u6848\u4f8b<\/h3>\n
\n
Sync.Mutex<\/h4>\n
package main\n\nimport "sync"\n\ntype MyInt struct {\n mu sync.Mutex\n val int\n}\n\nfunc main() {\n var i MyInt\n\n \/\/ i.mu is usable without explicit initialisation.\n i.mu.Lock()\n i.val++\n i.mu.Unlock()\n}<\/code><\/pre>\nByte.Buffer<\/h4>\n
package main\n\nimport "bytes"\nimport "io"\nimport "os"\n\nfunc main() {\n var b bytes.Buffer\n b.Write([]byte("Hello world"))\n io.Copy(os.Stdout, &b)\n}<\/code><\/pre>\nSlices<\/h4>\n
package main\n\nimport "fmt"\nimport "strings"\n\nfunc main() {\n \/\/ s := make([]string, 0)\n \/\/ s := []string{}\n var s []string\n\n s = append(s, "Hello")\n s = append(s, "world")\n fmt.Println(strings.Join(s, " "))\n}<\/code><\/pre>\nNil func<\/h4>\n
package main\n\nimport "fmt"\n\ntype Config struct {\n path string\n}\n\nfunc (c *Config) Path() string {\n if c == nil {\n return "\/usr\/home"\n }\n return c.path\n}\n\nfunc main() {\n var c1 *Config\n var c2 = &Config{\n path: "\/export",\n }\n fmt.Println(c1.Path(), c2.Path())\n}<\/code><\/pre>\n\u603b\u7ed3<\/h2>\n
Go \u56fe\u4e66\u7cfb\u5217<\/h3>\n
\n
\u66f4\u591a\u9605\u8bfb<\/h2>\n