{"id":3198,"date":"2025-03-25T23:55:37","date_gmt":"2025-03-25T15:55:37","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=3198"},"modified":"2025-03-25T23:55:37","modified_gmt":"2025-03-25T15:55:37","slug":"go-%e8%af%ad%e8%a8%80-map%ef%bc%88%e9%9b%86%e5%90%88%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/03\/25\/go-%e8%af%ad%e8%a8%80-map%ef%bc%88%e9%9b%86%e5%90%88%ef%bc%89\/","title":{"rendered":"Go \u8bed\u8a00 Map\uff08\u96c6\u5408\uff09"},"content":{"rendered":"\n<p>\u5728 Go \u8bed\u8a00\u4e2d\uff0c<code>map<\/code> \u662f\u4e00\u79cd\u5185\u5efa\u7684\u6570\u636e\u7c7b\u578b\uff0c\u5b83\u662f\u65e0\u5e8f\u7684\u952e\u503c\u5bf9\u96c6\u5408\uff0c\u7c7b\u4f3c\u4e8e\u5176\u4ed6\u7f16\u7a0b\u8bed\u8a00\u4e2d\u7684\u5b57\u5178\uff08Python\uff09\u6216\u54c8\u5e0c\u8868\uff08Java\uff09\u3002<code>map<\/code> \u53ef\u4ee5\u901a\u8fc7\u952e\uff08key\uff09\u6765\u5feb\u901f\u67e5\u627e\u5bf9\u5e94\u7684\u503c\uff08value\uff09\uff0c\u5b83\u975e\u5e38\u9002\u5408\u7528\u4e8e\u5b58\u50a8\u4e00\u5bf9\u4e00\u7684\u6620\u5c04\u5173\u7cfb\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>1. \u58f0\u660e\u548c\u521d\u59cb\u5316 Map<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>1.1 \u4f7f\u7528 <code>make<\/code> \u51fd\u6570\u58f0\u660e Map<\/strong><\/h3>\n\n\n\n<p><code>make<\/code> \u662f Go \u5185\u5efa\u7684\u51fd\u6570\uff0c\u53ef\u4ee5\u7528\u4e8e\u521d\u59cb\u5316 <code>map<\/code>\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>m := make(map&#91;string]int)  \/\/ \u521b\u5efa\u4e00\u4e2a\u952e\u4e3a string \u7c7b\u578b\uff0c\u503c\u4e3a int \u7c7b\u578b\u7684\u7a7a Map<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>1.2 \u4f7f\u7528\u5b57\u9762\u91cf\u58f0\u660e\u548c\u521d\u59cb\u5316 Map<\/strong><\/h3>\n\n\n\n<p>\u4f60\u8fd8\u53ef\u4ee5\u4f7f\u7528\u5b57\u9762\u91cf\u7684\u65b9\u5f0f\u521b\u5efa\u5e76\u521d\u59cb\u5316\u4e00\u4e2a <code>map<\/code>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>m := map&#91;string]int{\"apple\": 5, \"banana\": 3, \"cherry\": 8}<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>2. \u5411 Map \u4e2d\u6dfb\u52a0\u6216\u4fee\u6539\u5143\u7d20<\/strong><\/h2>\n\n\n\n<p>\u4f60\u53ef\u4ee5\u901a\u8fc7\u952e\u76f4\u63a5\u7ed9 <code>map<\/code> \u6dfb\u52a0\u65b0\u5143\u7d20\u6216\u4fee\u6539\u5df2\u6709\u5143\u7d20\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>m := make(map&#91;string]int)\nm&#91;\"apple\"] = 5   \/\/ \u6dfb\u52a0\u952e\u503c\u5bf9\nm&#91;\"banana\"] = 3  \/\/ \u6dfb\u52a0\u952e\u503c\u5bf9\n\n\/\/ \u4fee\u6539\u73b0\u6709\u5143\u7d20\nm&#91;\"apple\"] = 10  \/\/ \u4fee\u6539 \"apple\" \u952e\u7684\u503c<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>3. \u4ece Map \u4e2d\u5220\u9664\u5143\u7d20<\/strong><\/h2>\n\n\n\n<p>\u53ef\u4ee5\u4f7f\u7528 <code>delete<\/code> \u51fd\u6570\u4ece <code>map<\/code> \u4e2d\u5220\u9664\u6307\u5b9a\u952e\u7684\u5143\u7d20\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>m := map&#91;string]int{\"apple\": 5, \"banana\": 3, \"cherry\": 8}\ndelete(m, \"banana\")  \/\/ \u5220\u9664\u952e \"banana\" \u5bf9\u5e94\u7684\u5143\u7d20\nfmt.Println(m)        \/\/ \u8f93\u51fa: map&#91;apple:5 cherry:8]<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>4. \u67e5\u8be2 Map \u4e2d\u7684\u5143\u7d20<\/strong><\/h2>\n\n\n\n<p>\u67e5\u8be2 <code>map<\/code> \u65f6\uff0c\u5982\u679c\u952e\u5b58\u5728\uff0c\u5b83\u4f1a\u8fd4\u56de\u5bf9\u5e94\u7684\u503c\u3002\u5982\u679c\u952e\u4e0d\u5b58\u5728\uff0c\u5b83\u4f1a\u8fd4\u56de\u8be5\u503c\u7c7b\u578b\u7684\u96f6\u503c\uff08\u5982 <code>0<\/code>\u3001<code>\"\"<\/code> \u7b49\uff09\u3002\u4e3a\u4e86\u907f\u514d\u503c\u4e3a\u96f6\u503c\u65f6\u4e0e\u952e\u4e0d\u5b58\u5728\u7684\u60c5\u51b5\u6df7\u6dc6\uff0cGo \u63d0\u4f9b\u4e86\u7b2c\u4e8c\u4e2a\u8fd4\u56de\u503c\uff0c\u7528\u6765\u5224\u65ad\u952e\u662f\u5426\u5b58\u5728\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>4.1 \u4f7f\u7528\u4e24\u503c\u8d4b\u503c\u6cd5<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>m := map&#91;string]int{\"apple\": 5, \"banana\": 3, \"cherry\": 8}\nvalue, ok := m&#91;\"apple\"]  \/\/ ok \u4e3a true \u8868\u793a\u952e\u5b58\u5728\nfmt.Println(value, ok)    \/\/ \u8f93\u51fa: 5 true\n\nvalue, ok = m&#91;\"grape\"]   \/\/ ok \u4e3a false \u8868\u793a\u952e\u4e0d\u5b58\u5728\nfmt.Println(value, ok)    \/\/ \u8f93\u51fa: 0 false<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>5. \u904d\u5386 Map<\/strong><\/h2>\n\n\n\n<p>\u53ef\u4ee5\u4f7f\u7528 <code>for range<\/code> \u5faa\u73af\u904d\u5386 <code>map<\/code>\uff0c\u8fd4\u56de\u6bcf\u4e2a\u952e\u503c\u5bf9\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>m := map&#91;string]int{\"apple\": 5, \"banana\": 3, \"cherry\": 8}\nfor key, value := range m {\n    fmt.Println(\"Key:\", key, \"Value:\", value)\n}<\/code><\/pre>\n\n\n\n<p><strong>\u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Key: apple Value: 5\nKey: banana Value: 3\nKey: cherry Value: 8<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8bf7\u6ce8\u610f\uff1a<code>map<\/code> \u4e2d\u7684\u904d\u5386\u987a\u5e8f\u662f\u65e0\u5e8f\u7684\uff0c\u6bcf\u6b21\u904d\u5386\u7684\u987a\u5e8f\u53ef\u80fd\u4e0d\u540c\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>6. \u5224\u65ad Map \u662f\u5426\u4e3a nil<\/strong><\/h2>\n\n\n\n<p>\u672a\u521d\u59cb\u5316\u7684 <code>map<\/code> \u662f <code>nil<\/code>\uff0c\u6b64\u65f6\u4e0d\u80fd\u76f4\u63a5\u5411\u5176\u4e2d\u6dfb\u52a0\u5143\u7d20\u3002\u9700\u8981\u4f7f\u7528 <code>make<\/code> \u51fd\u6570\u6765\u521d\u59cb\u5316 <code>map<\/code>\u3002\u5982\u679c\u4e00\u4e2a <code>map<\/code> \u4e3a <code>nil<\/code>\uff0c\u5b83\u7684\u957f\u5ea6\u4e3a <code>0<\/code>\uff0c\u5e76\u4e14\u8bbf\u95ee\u5176\u4e2d\u7684\u5143\u7d20\u4f1a\u5bfc\u81f4\u8fd0\u884c\u65f6\u9519\u8bef\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>6.1 \u793a\u4f8b\uff1a\u5224\u65ad Map \u662f\u5426\u4e3a nil<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>var m map&#91;string]int\nfmt.Println(m == nil)  \/\/ \u8f93\u51fa: true\n\nm = make(map&#91;string]int)\nfmt.Println(m == nil)  \/\/ \u8f93\u51fa: false<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>7. Map \u7684\u7279\u70b9<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u65e0\u5e8f\u6027<\/strong>\uff1a<code>map<\/code> \u4e2d\u7684\u952e\u503c\u5bf9\u987a\u5e8f\u662f\u4e0d\u786e\u5b9a\u7684\uff0c\u6bcf\u6b21\u904d\u5386\u65f6\uff0c\u987a\u5e8f\u53ef\u80fd\u4f1a\u4e0d\u540c\u3002<\/li>\n\n\n\n<li><strong>\u952e\u7684\u552f\u4e00\u6027<\/strong>\uff1a<code>map<\/code> \u4e2d\u7684\u952e\u662f\u552f\u4e00\u7684\uff0c\u4e0d\u80fd\u91cd\u590d\u3002\u5982\u679c\u63d2\u5165\u76f8\u540c\u7684\u952e\uff0c\u65b0\u503c\u4f1a\u8986\u76d6\u65e7\u503c\u3002<\/li>\n\n\n\n<li><strong>\u52a8\u6001\u5927\u5c0f<\/strong>\uff1a<code>map<\/code> \u53ef\u4ee5\u52a8\u6001\u589e\u52a0\u6216\u51cf\u5c11\u5143\u7d20\u3002<\/li>\n\n\n\n<li><strong>\u503c\u7684\u7c7b\u578b<\/strong>\uff1a<code>map<\/code> \u7684\u503c\u53ef\u4ee5\u662f\u4efb\u4f55\u7c7b\u578b\uff0c\u5305\u62ec\u5176\u4ed6\u7684 <code>map<\/code>\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>8. Map \u7684\u5185\u5b58\u548c\u6027\u80fd<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u5185\u5b58<\/strong>\uff1a<code>map<\/code> \u4f1a\u6839\u636e\u5176\u5927\u5c0f\u81ea\u52a8\u589e\u957f\u3002\u521d\u59cb\u5bb9\u91cf\u8f83\u5c0f\uff0c\u4f46\u968f\u7740\u5143\u7d20\u589e\u52a0\uff0c<code>map<\/code> \u4f1a\u8fdb\u884c\u6269\u5bb9\u3002<\/li>\n\n\n\n<li><strong>\u6027\u80fd<\/strong>\uff1aGo \u7684 <code>map<\/code> \u57fa\u4e8e\u54c8\u5e0c\u8868\u5b9e\u73b0\uff0c\u63d0\u4f9b\u4e86\u5e38\u6570\u65f6\u95f4\u7684\u67e5\u627e\u3001\u63d2\u5165\u548c\u5220\u9664\u64cd\u4f5c\uff08\u5e73\u5747\u60c5\u51b5\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>9. \u603b\u7ed3<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u58f0\u660e<\/strong>\uff1a\u4f7f\u7528 <code>make<\/code> \u6216\u5b57\u9762\u91cf\u58f0\u660e\u3002<\/li>\n\n\n\n<li><strong>\u589e\u5220\u6539\u67e5<\/strong>\uff1a\u901a\u8fc7\u952e\u6dfb\u52a0\u3001\u5220\u9664\u3001\u4fee\u6539\u5143\u7d20\uff0c\u5e76\u4e14\u4f7f\u7528\u4e24\u503c\u8d4b\u503c\u6cd5\u5224\u65ad\u952e\u662f\u5426\u5b58\u5728\u3002<\/li>\n\n\n\n<li><strong>\u904d\u5386<\/strong>\uff1a\u4f7f\u7528 <code>range<\/code> \u904d\u5386 <code>map<\/code>\uff0c\u987a\u5e8f\u662f\u65e0\u5e8f\u7684\u3002<\/li>\n\n\n\n<li><strong>nil \u5224\u65ad<\/strong>\uff1a\u672a\u521d\u59cb\u5316\u7684 <code>map<\/code> \u4e3a <code>nil<\/code>\uff0c\u9700\u8981\u901a\u8fc7 <code>make<\/code> \u51fd\u6570\u521d\u59cb\u5316\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\ud83d\udd39 \u53c2\u8003\u8d44\u6599<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/golang.org\/doc\/effective_go.html#maps\">Go \u5b98\u65b9\u6587\u6863 &#8211; Map<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/github.com\/golang\/go\/wiki\/Maps\">Go Wiki &#8211; Map<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 Go \u8bed\u8a00\u4e2d\uff0cmap \u662f\u4e00\u79cd\u5185\u5efa\u7684\u6570\u636e\u7c7b\u578b\uff0c\u5b83\u662f\u65e0\u5e8f\u7684\u952e\u503c\u5bf9\u96c6\u5408\uff0c\u7c7b\u4f3c\u4e8e\u5176\u4ed6\u7f16\u7a0b\u8bed\u8a00\u4e2d\u7684\u5b57\u5178\uff08Python [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3199,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[58],"tags":[],"class_list":["post-3198","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-golang"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3198","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=3198"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3198\/revisions"}],"predecessor-version":[{"id":3200,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3198\/revisions\/3200"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media\/3199"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=3198"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=3198"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=3198"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}