\u200b Map\u7c7b\u578b\u53c8\u53ef\u4ee5\u79f0\u4e4b\u4e3a\u5b57\u5178\u7c7b\u578b\uff0c\u662f\u4e00\u79cd\u65e0\u9700\u7684\u57fa\u4e8ekey:value\u7684\u6570\u636e\u7ed3\u6784<\/p>\n
\u200b \u5b9a\u4e49\u8bed\u6cd5\u5982\u4e0b<\/p>\n
map[KeyType]ValueType\n\n\/\/1\u3001KeyType:\u8868\u793a\u952e\u7684\u7c7b\u578b\uff0c\n\/\/2\u3001ValueType:\u8868\u793a\u952e\u5bf9\u5e94\u7684\u503c\u7684\u7c7b\u578b\n\/\/3\u3001map\u4e2d\u6240\u6709\u7684Key\u90fd\u5fc5\u987b\u662f\u76f8\u540c\u7684\u7c7b\u578b\uff0c\u6240\u6709\u7684value\u4e5f\u5fc5\u987b\u90fd\u662f\u76f8\u540c\u7684\u7c7b\u578b\uff0c\u4f46\u662fkey\u4e0evalue\u4e4b\u95f4\u53ef\u4ee5\u662f\u4e0d\u540c\u7684\u7c7b\u578b\n\/\/4\u3001\u5176\u4e2dKeyType\u5fc5\u987b\u662f\u53ef\u4ee5\u4e0e\u975enil\u503c\u8fdb\u884c\u76f8\u7b49\u6027\u5224\u65ad\u7684\u7c7b\u578b\uff08\u6240\u6709\u7684\u503c\u7c7b\u578b\u90fd\u652f\u6301\u76f8\u7b49\u6027\u5224\u65ad\uff0c\u6240\u6709\u7684\u5f15\u7528\u7c7b\u578b\u53ea\u80fd\u4e0enil\u503c\u5224\u65ad\uff09\uff0c\u56e0\u6b64\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e0ekey\u7684\u76f8\u7b49\u6027\u5224\u65ad\u6765\u5224\u5b9akey\u662f\u5426\u5b58\u5728\u3002\u867d\u7136\u6d6e\u70b9\u7c7b\u578b\u4e5f\u652f\u6301\u4e0e\u975enil\u503c\u8fdb\u884c\u76f8\u7b49\u6027\u8fd0\u7b97\uff0c\u4f46\u662f\u4e0d\u5efa\u8bae\u7528\u6d6e\u70b9\u578b\u4f5c\u4e3aKeyType\uff0c\u56e0\u4e3a\u6d6e\u70b9\u6570\u5b58\u5728\u975e\u6570NaN,\u800cNaN\u4e0e\u4efb\u4f55\u6d6e\u70b9\u6570\u90fd\u4e0d\u76f8\u7b49\uff0c\u8fd9\u4fbf\u5931\u53bb\u4e86\u610f\u4e49\u3002\n\/\/5\u3001\u5bf9\u4e8eValueType\u6ca1\u6709\u4efb\u4f55\u9650\u5236<\/code><\/pre>\n\u200b \u793a\u8303<\/p>\n
var m map[string]int\nfmt.Println(m) \/\/ map[]\nfmt.Println(m==nil) \/\/ true<\/code><\/pre>\n\u200b \u56e0\u4e3aMap\u4e0e\u5207\u7247\u7c7b\u578b\u4e00\u6837\u90fd\u662f\u5f15\u7528\u7c7b\u578b\uff0c\u6240\u4ee5\u96f6\u503c\u4e3anil\uff0c\u6240\u4ee5\u65e0\u6cd5\u5b8c\u6210\u4e0b\u8ff0\u8d4b\u503c<\/p>\n
m["k1"]=111 \/\/ panic\u5f02\u5e38: assignment to entry in nil map<\/code><\/pre>\n\u200b \u00b7\u9700\u8981\u6211\u4eec\u7528make\u51fd\u6570\u4e3a\u5176\u7533\u8bf7\u597d\u5185\u5b58\u7a7a\u95f4<\/p>\n
make(map[KeyType]ValueType) \n\n\/\/ \u793a\u4f8b\nvar m = make(map[string]int)\nfmt.Println(m) \/\/ map[]\nfmt.Println(m==nil) \/\/ false\nm["k1"]=111\nfmt.Println(m) \/\/ map[k1:111]<\/code><\/pre>\n\u200b <\/p>\n
\u200b \u6211\u4eec\u4e5f\u53ef\u4ee5\u7528map\u5b57\u9762\u503c\u7684\u8bed\u6cd5\u521b\u5efamap\uff0c\u540c\u65f6\u8fd8\u53ef\u4ee5\u6307\u5b9a\u4e00\u4e9b\u6700\u521d\u7684key\/value\uff1a<\/p>\n
scoreMap:=map[string]int{\n "egon":99,\n "\u94c1\u86cb":100,\n "\u94dc\u86cb":88,\n}\n\/\/ \u4e0a\u8ff0\u4ee3\u7801\u7b49\u540c\u4e8e\nscoreMap := make(map[string]int)\nscoreMap["egon"] = 99\nscoreMap["\u94c1\u86cb"] = 100\nscoreMap["\u94dc\u86cb"] = 88\n\nfmt.Println(scoreMap["egon"]) \/\/ 99<\/code><\/pre>\n\u200b \u6211\u4eec\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u7a7a\u7684map\uff1a\u8868\u8fbe\u5f0f\u662fmap[string]int{}<\/code><\/p>\nvar scoreMap = map[string]int{}\nfmt.Println(scoreMap == nil) \/\/ false\nscoreMap["egon"] = 99\nfmt.Println(scoreMap["egon"]) \/\/ 99<\/code><\/pre>\n\u4e8c map\u5143\u7d20\u7684\u589e\u5220\u6539\u67e5<\/h2>\nvar m = make(map[string]string)\n\/\/ \u589e\u52a0\nm["name"]="egon"\nm["age"]="18"\nm["gender"]="male"\nfmt.Println(m) \/\/ map[age:18 gender:male name:egon]\n\n\/\/ \u5220\u9664\ndelete(m,"gender")\nfmt.Println(m) \/\/ map[age:18 name:egon]\ndelete(m,"kkk") \/\/ \u5373\u4f7fkey\u4e0d\u5728map\u4e2d\u4e5f\u6ca1\u6709\u5173\u7cfb\n\n\/\/ \u6539\nm["name"]="Egon"\nfmt.Println(m)\n\n\/\/ \u67e5\nfmt.Println(m["name"]) \/\/ Egon\nfmt.Println(m["gender"]) \/\/ \u82e5key\u4e0d\u5b58\u5728\u5219\u8fd4\u56devalue\u5bf9\u5e94\u7c7b\u578b\u7684\u96f6\u503c\n\n\/\/ ps\uff1a\u9488\u5bf9\u67e5\u64cd\u4f5c\uff0c\u56e0\u4e3a\u5f53key\u4e0d\u5b58\u5728\u65f6\u8fd4\u56de\u7684\u662fvalue\u5bf9\u5e94\u7c7b\u578b\u7684\u96f6\u503c\uff0c\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u8fd9\u4e48\u505a\nvar ages = make(map[string]int)\nages["egon"] += 1 \/\/ ages["egon"] = ages["egon"] + 1\nfmt.Println(ages) \/\/ 1\n\n\u6216\u8005\nages["egon"]++\nfmt.Println(ages) \/\/ 2<\/code><\/pre>\n\u4e09 \u5224\u65adkey\u662f\u5426\u5b58\u5728\u4e8emap\u4e2d<\/h2>\n
\u200b \u9488\u5bf9\u64cd\u4f5cm[key]\uff0c\u5f53key\u4e0d\u5b58\u5728\u65f6,\u8fd4\u56de\u7684\u662fvalue\u5bf9\u5e94\u7c7b\u578b\u7684\u96f6\u503c\uff0c\u800c\u6781\u6709\u53ef\u80fd\u51fa\u73b0key\u5b58\u5728\uff0c\u4f46\u8be5key\u5bf9\u5e94\u7684\u503c\u4e0e\u5176\u96f6\u503c\u662f\u76f8\u7b49\u7684\uff0c\u5982\u4e0b\u6240\u793a<\/p>\n
var ages = make(map[string]int)\nages["\u5f20\u4e09"]=0\nfmt.Println(ages["\u5f20\u4e09"]) \/\/ \u952e"\u5f20\u4e09"\u5b58\u5728\uff0c\u53d6\u5230\u503c\u4e3a0\nfmt.Println(ages["egon"]) \/\/ \u952e"egon"\u4e0d\u5b58\u5728\uff0c\u53d6\u5230\u503c\u5bf9\u5e94\u7c7b\u578b\u7684\u96f6\u503c\u540c\u6837\u4e3a0<\/code><\/pre>\n\u200b \u6240\u4ee5\u6211\u4eec\u65e0\u6cd5\u901a\u8fc7m[key]\u53d6\u5230\u7684\u503c\u4f5c\u4e3a\u5224\u65ad\u4f9d\u636e\u6765\u5224\u5b9akey\u662f\u5426\u5b58\u5728\uff0c\u9700\u8981\u8fd9\u4e48\u505a<\/p>\n
age1,ok:=ages["\u5f20\u4e09"]\nfmt.Println(age1,ok) \/\/ 0 true\uff0ctrue\u4ee3\u8868key\u5b58\u5728\uff0c0\u5c31\u662f\u53d6\u5230\u7684\u503c\n\nage2,ok:=ages["egon"]\nfmt.Println(age2,ok) \/\/ 0 false\uff0cfalse\u4ee3\u8868key\u4e0d\u5b58\u5728\uff0c0\u662f\u503c\u5bf9\u5e94\u7c7b\u578b\u7684\u96f6\u503c\n\nif ok {\n fmt.Println(age2)\n} else {\n fmt.Println("\u67e5\u65e0\u6b64\u4eba")\n}<\/code><\/pre>\n\u56db \u904d\u5386map<\/h2>\n
\u200b Go\u8bed\u8a00\u4e2d\u4f7f\u7528for range<\/code>\u904d\u5386map<\/p>\nvar ages = make(map[string]int)\nages["egon"] = 18\nages["\u5f20\u4e09"] = 19\nages["\u674e\u56db"] = 20\n\n\/\/ 1\u3001\u5faa\u73af\u8bfb\u53d6k\u548cv\nfor k,v := range ages {\n fmt.Println(k,v)\n}\n\n\/\/ 2\u3001\u5faa\u73af\u53ea\u8bfb\u53d6k\uff0c\u4e0b\u8ff0\u4e24\u79cd\u65b9\u5f0f\u90fd\u53ef\u4ee5\nfor k,_ := range ages {\n fmt.Println(k,v)\n}\n\nfor k := range ages {\n fmt.Println(k)\n}\n\n\/\/ 3\u3001\u5faa\u73af\u53ea\u8bfb\u53d6v\nfor _,v := range ages {\n fmt.Println(v)\n}<\/code><\/pre>\n\u200b \u904d\u5386map\u65f6\u7684\u5143\u7d20\u987a\u5e8f\u4e0e\u6dfb\u52a0\u952e\u503c\u5bf9\u7684\u987a\u5e8f\u65e0\u5173\uff0c\u82e5\u60f3\u6309\u7167\u6307\u5b9a\u987a\u5e8f\u904dmap\uff0c\u9700\u8981\u5c06map\u4e2d\u7684key\u5b58\u5165\u5207\u7247\uff0c\u7136\u540e\u5bf9\u5207\u7247\u8fdb\u884c\u6392\u5e8f\u540e\uff0c\u4f9d\u636e\u5207\u7247\u4e2d\u6392\u5e8f\u597d\u7684key\u4f9d\u6b21\u53d6map\u4e2d\u7684value<\/p>\n
var ages = make(map[string]int) \nages["egon"] = 18\nages["\u5f20\u4e09"] = 19\nages["\u674e\u56db"] = 20\nages["\u738b\u4e94"] = 21\nages["\u725b\u4f70"] = 22\n\n\/\/ 1\u3001\u65e0\u5e8f\u904d\u5386\nfor k, v := range ages {\n fmt.Println(k, v)\n}\n\n\/\/ 2\u3001\u6709\u5e8f\u904d\u5386\nvar keys []string\n\nfor k := range ages {\n keys = append(keys, k)\n}\nsort.Strings(keys) \/\/ Strings\u51fd\u6570\u63a5\u6536\u7684\u53c2\u6570\u662f\u5207\u7247\u7c7b\u578b\uff0c\u8fd9\u4e5f\u662f\u6211\u4eec\u628aage\u4e2d\u7684key\u653e\u5165\u5207\u7247\u7c7b\u578b\u4e2d\u7684\u539f\u56e0\n\nfor _, k := range keys {\n fmt.Printf("%s\\t%d\\n", k, ages[k])\n}\n\n\/\/ ps\uff1a\n\u56e0\u4e3a\u6211\u4eec\u4e00\u5f00\u59cb\u5c31\u77e5\u9053keys\u7684\u6700\u7ec8\u5927\u5c0f\uff0c\u56e0\u6b64\u7ed9\u5207\u7247keys\u5206\u914d\u4e00\u4e2a\u5408\u9002\u7684\u5927\u5c0f\u5c06\u4f1a\u66f4\u6709\u6548\uff0c\u5982\u4e0b\u6240\u793a\nkeys := make([]string, 0, len(ages)) \/\/ \u5bb9\u91cf\u521a\u597d\u53ef\u4ee5\u653e\u4e0bmap\u4e2d\u5168\u90e8\u7684key\uff1a<\/code><\/pre>\n\u4e94 go\u7981\u6b62\u5bf9map\u5143\u7d20\u53d6\u5730\u5740<\/h2>\n
\u200b \u5f53\u65b0\u589e\u5143\u7d20\u65f6\uff0cmap\u4e5f\u4f1a\u968f\u7740\u5143\u7d20\u6570\u91cf\u7684\u589e\u957f\u800c\u91cd\u65b0\u5206\u914d\u66f4\u5927\u7684\u5185\u5b58\u7a7a\u95f4\uff0c\u4ece\u800c\u53ef\u80fd\u5bfc\u81f4\u4e4b\u524d\u7684\u5730\u5740\u65e0\u6548\uff0c\u4e86\u89e3\u5373\u53ef\u3002\u4f46\u662f\u6709\u4e00\u70b9\u9700\u8981\u6ce8\u610f\u7684\u662fgo\u8bed\u8a00\u8bbe\u8ba1\u89c4\u5b9a\u6211\u4eec\u53ef\u4ee5\u5bf9\u5207\u7247\u4e2d\u7684\u5143\u7d20\u53d6\u5730\u5740\uff0c\u4f46\u662f\u6211\u4eec\u65e0\u6cd5\u5bf9map\u4e2d\u7684\u5143\u7d20\u53d6\u5730\u5740<\/p>
<\/div>\u67e5\u770b\u66f4\u591a<\/h2>\u8054\u7cfb\u7ba1\u7406\u5458\u5fae\u4fe1tutu19192010\uff0c\u6ce8\u518c\u8d26\u53f7<\/p>\n<\/div>
<\/div>