{"id":110166,"date":"2020-05-03T02:37:57","date_gmt":"2020-05-02T18:37:57","guid":{"rendered":"http:\/\/4563.org\/?p=110166"},"modified":"2020-05-03T02:37:57","modified_gmt":"2020-05-02T18:37:57","slug":"go-slice-defaults-%e8%bf%99%e9%87%8c%e6%98%af%e5%9d%91%e8%bf%98%e6%98%af%e5%a6%82%e6%ad%a4%e8%ae%be%e8%ae%a1%ef%bc%9f","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=110166","title":{"rendered":"go slice defaults \u8fd9\u91cc\u662f\u5751\u8fd8\u662f\u5982\u6b64\u8bbe\u8ba1\uff1f"},"content":{"rendered":"
\n
\n
\n

go slice defaults \u8fd9\u91cc\u662f\u5751\u8fd8\u662f\u5982\u6b64\u8bbe\u8ba1\uff1f <\/h1>\n

<\/p>\n

\n
\u8cc7\u6df1\u5927\u4f6c : saltsugar <\/span> <\/i> 42<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
<\/p>\n

\/\/ https:\/\/tour.golang.org\/moretypes\/10<\/p>\n

package main<\/p>\n

import “fmt”<\/p>\n

func main() { s := []int{1, 2, 3, 4, 5, 6}<\/p>\n

s = s[1:4] fmt.Println(s)  s = s[:5] fmt.Println(s) \/\/ \u8fd9\u91cc s \u63a5\u4e0a\u9762\u7684\u8d77\u70b9 2\uff0c\u4f46\u662f\u7ec8\u70b9\u5374\u662f 6 \uff1f  s = s[1:] fmt.Println(s)  <\/code><\/pre>\n
}<\/p>\n
\/\/\/\/output<\/p>\n
[2 3 4]<\/p>\n
[2 3 4 5 6]<\/p>\n
[3 4 5 6]<\/p>\n<\/p><\/div>\n
 \u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (12<\/span>)        <\/div>\n
 <\/div>\n<\/p><\/div>\n<\/p><\/div>\n
    \n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : doylecnn <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u4e0b\u6807\u4ece 0 \u5f00\u59cb\u5440\uff0c\u54ea\u91cc\u5751\u4e86\uff1f                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : catror <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u8fd9\u662f\u8bbe\u8ba1\uff0c\u8fb9\u754c\u4e0d\u8d85\u8fc7 cap \u5c31\u884c                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : ArJun <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u8fd9\u79cd\u8d4b\u503c\u64cd\u4f5c\u4e00\u822c\u4e0d\u63a8\u8350\u5427\uff0c\u4f60\u4f7f\u7528\u7684\u59cb\u7ec8\u662f\u4e00\u4e2a\u5bf9\u8c61                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : lostpg <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u4e0b\u8868\u4ece\u96f6\u5f00\u59cb\uff0cend \u7684\u503c\u662f\u672b\u5c3e\u5143\u7d20\u4e0b\u6807+1\u3002\u8fd9\u79cd\u7528\u6cd5\u6709\u6897\u7684                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : lostpg <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @lostpg \u770b\u5c94\u4e86\uff0c\u5ffd\u7565                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : petelin <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u7b2c\u4e8c\u4e2a\u7528\u6cd5\u6211\u5176\u5b9e\u633a\u60ca\u8bb6\u7684 
    \u6211\u4e00\u76f4\u4ee5\u4e3a\u8fb9\u754c\u662f len \u8fd9\u6837\u770b\u662f cap                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : saltsugar <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @doylecnn \u662f\u4e0b\u6807\u7ed3\u5c3e\u54c8<\/p>\n
    @catror \u76f4\u89c9\u4e0a\u7406\u89e3\uff0cslice \u524d\u540e\u8fb9\u754c\u5e94\u8be5\u662f\u9650\u5b9a\u4e86\u3002
    \u6bd4\u5982\u7b2c\u4e09\u6b21 slice \u7684\u9996\u8fb9\u754c\u5c31\u5728\u539f\u6765\u57fa\u7840\u4e0a+1 \u4e86\u3002
    \u5982\u679c\u7b2c\u4e8c\u6b21 slice \u80fd\u5c06\u4e0a\u4e00\u4e2a\u5c3e\u90e8\u6269\u5c55\u7684\u8bdd\uff0c\u90a3\u4e48\u9996\u8fb9\u754c\u5374\u4e0d\u80fd\u5f80\u524d\u79fb\u52a8\uff0c\u8fd9\u70b9\u53cd\u76f4\u89c9\u5427<\/p>\n
    @ArJun \u662f\u4e0d\u63a8\u8350\u3002\u53cd\u76f4\u89c9\u554a
    @petelin \u5bf9                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : ethego <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u6570\u7ec4\u8d8a\u754c\u4e86\uff0c\u6240\u4ee5\u53d6\u5230\u4e86 slice \u5916\u9762\u7684\u4e1c\u897f\uff0c\u8fd9\u65f6\u5019\u662f\u672a\u5b9a\u4e49\u884c\u4e3a\uff0c\u53d6\u5230\u4efb\u4f55\u4e1c\u897f\u90fd\u4e0d\u5947\u602a\u3002\u53ea\u662f\u8fd9\u91cc slice \u6ca1\u6709\u53d1\u751f\u62f7\u8d1d\uff0c\u53d6\u5230\u4e86\u539f\u5730\u5740\u540e\u9762\u7684\u4e1c\u897f\u4e86\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : ethego <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u81f3\u4e8e\u53d6\u5206\u7247\u4e3a\u4ec0\u4e48\u6ca1\u6709\u62f7\u8d1d\u6216\u8005\u4e0d\u505a\u8d8a\u754c\u68c0\u67e5\u5f53\u7136\u662f\u4e3a\u4e86\u6027\u80fd\uff0c\u6240\u4ee5\u633a\u5408\u7406\u7684                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : zhyl <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u5207\u7247\u548c\u6570\u7ec4\u662f\u4e0d\u540c\u7684. \u4e24\u79cd\u7c7b\u578b\u80fd\u591f\u7d22\u5f15\u6570\u636e\u7684\u8303\u56f4\u90fd\u662f\u5728 len(x)\u4e4b\u5185\u7684.
    \u4f46\u662f\u5207\u7247\u53ef\u4ee5\u901a\u8fc7\u91cd\u65b0\u5207\u7247\u6765\u6269\u5c55\u5b83\u7684 len, \u91cd\u65b0\u5207\u7247\u5141\u8bb8\u7684\u8303\u56f4\u662f\u5176\u5e95\u5c42\u6570\u7ec4\u51b3\u5b9a\u7684, \u5b83\u7b49\u4e8e\u5207\u7247\u7684 cap.
    \u4e0d\u5b58\u5728\u6570\u7ec4\u8d8a\u754c\u548c\u672a\u5b9a\u4e49\u884c\u4e3a\u8fd9\u79cd\u8bf4\u6cd5.                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : ethego <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @zhyl \u55ef\uff0c\u8bd5\u4e86\u4e0b\u4f60\u8bf4\u7684\u662f\u5bf9\u7684                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : zhuyuefeng <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u8fd9\u4e48\u89e3\u91ca\u4e0d\u77e5\u9053\u5408\u4e0d\u5408\u9002\uff1a<\/p>\n
    \/\/ origin 
    s := []int{1, 2, 3, 4, 5, 6}<\/p>\n
    s = s[1:4]
    \/\/ \u6b64\u65f6 s \u662f\u539f\u6570\u7ec4\u7684\u5207\u7247\uff0c\u5176\u5185\u5bb9\u5c31\u662f[2 3 4]\uff0c\u7d22\u5f15 index 1, 2, 3 \u7684\u503c
    \/\/ \u4f46\u539f\u6570\u7ec4\u7684 cap \u6bd4\u73b0\u5728\u7684\u5207\u7247\u5927\uff0c\u6240\u4ee5\u76ee\u524d\u662f\u53ef\u4ee5\u6269\u5c55\u7684
    \/\/ [2 3 4]
    fmt.Println(s)<\/p>\n
    s = s[:5]
    \/\/ \u8fdb\u884c\u91cd\u5207\u7247\uff0c\u6b64\u65f6\u53d1\u73b0\u539f\u5207\u7247\u4e0d\u591f\u5927\uff0c\u4f46\u5e95\u5c42\u6570\u7ec4\u7684 cap \u591f\uff0c\u4e5f\u5c31\u589e\u52a0\u4e86\u540e\u9762\u7684 6\uff0c\u5c31\u662f index=4 \u7684\u503c
    fmt.Println(s) 
    \/\/ [2 3 4 5 6]<\/p>\n
    s = s[1:]
    \/\/ \u6b64\u65f6\u53c8\u91cd\u65b0\u5207\u7247 \u53bb\u6389\u7b2c\u4e00\u4e2a\u5143\u7d20 index=0\uff0c\u4e5f\u5c31\u662f 2\uff0c\u90a3\u4e48\u8fd4\u56de\u7684\u6570\u636e\u5c31\u662f[3 4 5 6]
    fmt.Println(s) 
    \/\/ [3 4 5 6]                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n","protected":false},"excerpt":{"rendered":"
    go slice defaults…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/110166"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=110166"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/110166\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=110166"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=110166"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=110166"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}