{"id":457,"date":"2025-04-13T19:02:56","date_gmt":"2025-04-13T11:02:56","guid":{"rendered":"http:\/\/120.55.184.7\/?p=457"},"modified":"2025-05-08T14:15:57","modified_gmt":"2025-05-08T06:15:57","slug":"go-%e5%86%85%e7%bd%ae%e5%87%bd%e6%95%b0clear","status":"publish","type":"post","link":"https:\/\/beijian99.top\/?p=457","title":{"rendered":"Go \u5185\u7f6e\u51fd\u6570clear"},"content":{"rendered":"\n

1. \u529f\u80fd\u4e0e\u8bed\u6cd5<\/strong><\/h3>\n\n\n\n

clear<\/code> \u51fd\u6570\u7528\u4e8e\u6e05\u7a7a \u5207\u7247\uff08slice\uff09<\/strong> \u6216 \u6620\u5c04\uff08map\uff09<\/strong> \u4e2d\u7684\u5143\u7d20\uff0c\u652f\u6301\u6cdb\u578b\u7c7b\u578b\u53c2\u6570\u3002
\u51fd\u6570\u7b7e\u540d<\/strong>\uff1a<\/p>\n\n\n

\nfunc clear[T ~[]Type | ~map[Type]Type1](t T)\n<\/pre><\/div>\n\n\n
\u5bf9\u4e0d\u540c\u7c7b\u578b\u7684\u4f5c\u7528<\/strong>\uff1a<\/h4>\n\n\n\n
\u7c7b\u578b<\/th>\u884c\u4e3a<\/th>\u793a\u4f8b\u7ed3\u679c\uff08\u957f\u5ea6\/\u5bb9\u91cf\uff09<\/th><\/tr><\/thead>
\u5207\u7247<\/strong><\/td>\u5c06\u5207\u7247\u5185\u6240\u6709\u5143\u7d20\u8bbe\u7f6e\u4e3a\u5bf9\u5e94\u7c7b\u578b\u7684\u96f6\u503c\uff0c\u4fdd\u7559\u539f\u59cb\u957f\u5ea6\u548c\u5bb9\u91cf\u3002<\/td>[0 0 0 0]<\/code>\uff08len=4, cap=4\uff09<\/td><\/tr>
\u6620\u5c04<\/strong><\/td>\u5220\u9664\u6240\u6709\u952e\u503c\u5bf9\uff0c\u6620\u5c04\u53d8\u4e3a\u7a7a\uff08len=0<\/code>\uff09\u3002<\/td>map[]<\/code>\uff08len=0\uff09<\/td><\/tr>
\u6cdb\u578b\u7c7b\u578b<\/strong><\/td>\u7c7b\u578b\u53c2\u6570\u5fc5\u987b\u662f\u5207\u7247\u6216\u6620\u5c04\uff08\u5982 type MySlice[T any] []T<\/code>\uff09\u3002<\/td>\u884c\u4e3a\u4e0e\u666e\u901a\u5207\u7247\/\u6620\u5c04\u4e00\u81f4<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\n\n\n\n
2. \u4ee3\u7801\u793a\u4f8b<\/strong><\/h3>\n\n\n\n
(1) \u6e05\u7a7a\u5207\u7247<\/strong><\/h4>\n\n\n
\ns := []int{1, 2, 3, 4}\nclear(s)\nfmt.Printf("len: %d, cap: %d, elems: %v\\n", len(s), cap(s), s) \n\/\/ \u8f93\u51fa\uff1alen: 4, cap: 4, elems: [0 0 0 0]\n<\/pre><\/div>\n\n\n
(2) \u6e05\u7a7a\u6620\u5c04<\/strong><\/h4>\n\n\n
\nm := map[string]int{"Apple": 1, "Banana": 2}\nclear(m)\nfmt.Printf("len: %d, elems: %v\\n", len(m), m) \n\/\/ \u8f93\u51fa\uff1alen: 0, elems: map[]\n<\/pre><\/div>\n\n\n
(3) \u81ea\u5b9a\u4e49\u6cdb\u578b\u7c7b\u578b<\/strong><\/h4>\n\n\n
\ntype MySlice[T any] []T\nmySlice := MySlice[string]{"Go", "Gopher"}\nclear(mySlice)\nfmt.Printf("elems: %v\\n", mySlice) \n\/\/ \u8f93\u51fa\uff1aelems: [  ]\uff08\u5b57\u7b26\u4e32\u96f6\u503c\u4e3a\u7a7a\u5b57\u7b26\u4e32\uff09\n<\/pre><\/div>\n\n\n
\n\n\n\n
3. \u6ce8\u610f\u4e8b\u9879<\/strong><\/h3>\n\n\n\n
    \n
  1. \u5207\u7247\u6e05\u7a7a\u903b\u8f91<\/strong>\uff1a
    \u2022 clear<\/code> \u4ec5\u5c06\u5143\u7d20\u7f6e\u96f6\uff0c\u4e0d\u4f1a\u91ca\u653e\u5185\u5b58<\/strong>\uff08\u4fdd\u7559\u5bb9\u91cf\uff09\u3002
    \u2022 \u82e5\u9700\u5b8c\u5168\u91cd\u7f6e\u5207\u7247\uff08\u957f\u5ea6\u548c\u5bb9\u91cf\u5f52\u96f6\uff09\uff0c\u9700\u624b\u52a8\u8d4b\u503c nil<\/code> \u6216\u65b0\u5efa\u5207\u7247\uff1a s = nil \/\/ \u91ca\u653e\u5185\u5b58\uff0clen=0, cap=0 s = make([]T, 0) \/\/ \u65b0\u5efa\u7a7a\u5207\u7247<\/code><\/li>\n\n\n\n
  2. \u7279\u6b8a\u503c\u5904\u7406<\/strong>\uff1a
    \u2022 \u5bf9\u5305\u542b NaN\uff08Not a Number\uff09<\/strong> \u7684\u6620\u5c04\uff0cclear<\/code> \u80fd\u6b63\u786e\u5220\u9664\u6240\u6709\u6761\u76ee\uff08\u5305\u62ec NaN\uff09\u3002<\/li>\n\n\n\n
  3. \u6cdb\u578b\u7ea6\u675f<\/strong>\uff1a
    \u2022 \u81ea\u5b9a\u4e49\u6cdb\u578b\u7c7b\u578b\u5fc5\u987b\u4ec5\u5305\u542b\u5207\u7247\u6216\u6620\u5c04\u7c7b\u578b\uff08\u5982 type MyMap[K comparable, V any] map[K]V<\/code>\uff09\u3002<\/li>\n<\/ol>\n\n\n\n
    \n\n\n\n
    4. \u9002\u7528\u573a\u666f<\/strong><\/h3>\n\n\n\n
      \n
    • \u5feb\u901f\u91cd\u7f6e\u5bb9\u5668<\/strong>\uff1a\u907f\u514d\u624b\u52a8\u5faa\u73af\u7f6e\u96f6\u6216\u5220\u9664\u6620\u5c04\u6761\u76ee\u3002<\/li>\n\n\n\n
    • \u5185\u5b58\u590d\u7528<\/strong>\uff1a\u4fdd\u7559\u5207\u7247\u5bb9\u91cf\uff0c\u51cf\u5c11\u91cd\u590d\u5185\u5b58\u5206\u914d\u5f00\u9500\u3002<\/li>\n\n\n\n
    • \u6cdb\u578b\u4ee3\u7801\u7b80\u5316<\/strong>\uff1a\u7edf\u4e00\u5904\u7406\u5207\u7247\u548c\u6620\u5c04\u7684\u6e05\u7a7a\u903b\u8f91\u3002<\/li>\n<\/ul>\n\n\n\n
      \n\n\n\n
      \u603b\u7ed3<\/strong><\/h3>\n\n\n\n
      clear<\/code> \u51fd\u6570\u4e3a Go \u5f00\u53d1\u8005\u63d0\u4f9b\u4e86\u4e00\u79cd\u9ad8\u6548\u3001\u7edf\u4e00\u7684\u65b9\u5f0f\u6e05\u7a7a\u5207\u7247\u548c\u6620\u5c04\uff0c\u5c24\u5176\u5728\u5904\u7406\u6cdb\u578b\u5bb9\u5668\u65f6\u7b80\u5316\u4e86\u4ee3\u7801\u903b\u8f91\u3002\u7136\u800c\uff0c\u9700\u6ce8\u610f\u5176\u5bf9\u5207\u7247\u5185\u5b58\u7ba1\u7406\u7684\u5c40\u9650\u6027\uff0c\u5fc5\u8981\u65f6\u4ecd\u9700\u624b\u52a8\u8c03\u6574\u957f\u5ea6\u548c\u5bb9\u91cf\u3002<\/p>\n\n\n\n
      <\/p>\n\n\n\n
      \"\"<\/figure>\n","protected":false},"excerpt":{"rendered":"
      1. \u529f\u80fd\u4e0e\u8bed\u6cd5 clear \u51fd\u6570\u7528\u4e8e\u6e05\u7a7a \u5207\u7247\uff08slice\uff09 \u6216 \u6620\u5c04\uff08map\uff09 \u4e2d\u7684\u5143\u7d20\uff0c\u652f\u6301\u6cdb\u578b\u7c7b\u578b\u53c2\u6570 […]<\/p>\n","protected":false},"author":1,"featured_media":981,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[121],"tags":[152],"class_list":["post-457","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-golang","tag-go"],"_links":{"self":[{"href":"https:\/\/beijian99.top\/index.php?rest_route=\/wp\/v2\/posts\/457","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/beijian99.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/beijian99.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/beijian99.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/beijian99.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=457"}],"version-history":[{"count":3,"href":"https:\/\/beijian99.top\/index.php?rest_route=\/wp\/v2\/posts\/457\/revisions"}],"predecessor-version":[{"id":982,"href":"https:\/\/beijian99.top\/index.php?rest_route=\/wp\/v2\/posts\/457\/revisions\/982"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/beijian99.top\/index.php?rest_route=\/wp\/v2\/media\/981"}],"wp:attachment":[{"href":"https:\/\/beijian99.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=457"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/beijian99.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=457"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/beijian99.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=457"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}