{"id":131972,"date":"2020-07-07T01:33:22","date_gmt":"2020-07-06T17:33:22","guid":{"rendered":"http:\/\/4563.org\/?p=131972"},"modified":"2020-07-07T01:33:22","modified_gmt":"2020-07-06T17:33:22","slug":"scala%e8%af%ad%e8%a8%80%e5%ad%a6%e4%b9%a0%ef%bc%88%e4%ba%94%ef%bc%89%e3%80%81%e6%9f%af%e9%87%8c%e5%8c%96%e4%bb%a5%e5%8f%8a%e5%ba%94%e7%94%a8","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=131972","title":{"rendered":"scala\u8bed\u8a00\u5b66\u4e60\uff08\u4e94\uff09\u3001\u67ef\u91cc\u5316\u4ee5\u53ca\u5e94\u7528"},"content":{"rendered":"

<\/a>\u6982\u5ff5<\/h2>\n

\u67ef\u91cc\u5316(currying, \u4ee5\u903b\u8f91\u5b66\u5bb6Haskell Brooks Curry\u7684\u540d\u5b57\u547d\u540d)\u6307\u7684\u662f\u5c06\u539f\u6765\u63a5\u53d7\u4e24\u4e2a\u53c2\u6570\u7684\u51fd\u6570\u53d8\u6210\u65b0\u7684\u63a5\u53d7\u4e00\u4e2a\u53c2\u6570\u7684\u51fd\u6570\u7684\u8fc7\u7a0b\u3002\u65b0\u7684\u51fd\u6570\u8fd4\u56de\u4e00\u4e2a\u4ee5\u539f\u6709\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4f5c\u4e3a\u53c2\u6570\u7684\u51fd\u6570\u3002 \u5728Scala\u4e2d\u65b9\u6cd5\u548c\u51fd\u6570\u6709\u7ec6\u5fae\u7684\u5dee\u522b\uff0c\u901a\u5e38\u7f16\u8bd1\u5668\u4f1a\u81ea\u52a8\u5b8c\u6210\u65b9\u6cd5\u5230\u51fd\u6570\u7684\u8f6c\u6362\u3002<\/p>\n

<\/a>Scala\u4e2d\u67ef\u91cc\u5316\u7684\u5f62\u5f0f<\/h2>\n

Scala\u4e2d\u67ef\u91cc\u5316\u65b9\u6cd5\u7684\u5b9a\u4e49\u5f62\u5f0f\u548c\u666e\u901a\u65b9\u6cd5\u7c7b\u4f3c\uff0c\u533a\u522b\u5728\u4e8e\u67ef\u91cc\u5316\u65b9\u6cd5\u62e5\u6709\u591a\u7ec4\u53c2\u6570\u5217\u8868\uff0c\u6bcf\u7ec4\u53c2\u6570\u7528\u5706\u62ec\u53f7\u62ec\u8d77\u6765\u3002<\/p>\n

\"scala\u8bed\u8a00\u5b66\u4e60\uff08\u4e94\uff09\u3001\u67ef\u91cc\u5316\u4ee5\u53ca\u5e94\u7528\"<\/p>\n

mysum\u65b9\u6cd5\u62e5\u6709\u4e24\u7ec4\u53c2\u6570\uff0c\u5206\u522b\u662f(x: Int)\u548c(y: Int)\u3002<\/p>\n

mysum\u65b9\u6cd5\u5bf9\u5e94\u7684\u67ef\u91cc\u5316\u51fd\u6570\u7c7b\u578b\u662f\uff1a
Int => Int = >Int<\/code>
\u67ef\u91cc\u5316\u51fd\u6570\u7684\u7c7b\u578b\u58f0\u660e\u662f\u53f3\u7ed3\u5408\u7684\uff0c\u5373\u4e0a\u9762\u7684\u7c7b\u578b\u7b49\u4ef7\u4e8e\uff1a
Int => (Int = >Int)<\/code>
\u8868\u660e\u8be5\u51fd\u6570\u82e5\u53ea\u63a5\u53d7\u4e00\u4e2aInt\u53c2\u6570\uff0c\u5219\u8fd4\u56de\u4e00\u4e2aInt => Int\u7c7b\u578b\u7684\u51fd\u6570\uff0c\u8fd9\u4e5f\u548c\u67ef\u91cc\u5316\u7684\u8fc7\u7a0b\u76f8\u543b\u5408\u3002<\/p>\n

<\/a>\u793a\u4f8b<\/h2>\n
\n\n\n
\n
1<\/span>
2<\/span>
3<\/span>
4<\/span>
5<\/span>
6<\/span>
7<\/span>
8<\/span>
9<\/span>
10<\/span>
11<\/span>
12<\/span>
13<\/span>
14<\/span>
15<\/span>
16<\/span>
17<\/span>
18<\/span>
19<\/span>
20<\/span>
21<\/span>
22<\/span>
23<\/span>
24<\/span>
25<\/span>
26<\/span>
<\/pre>\n<\/td>\n
\n
def<\/span> getAddress<\/span><\/span>(a: String<\/span>): (String<\/span>, String<\/span>) => String<\/span> = {<\/span>
    (b: String<\/span>,c: String<\/span>) => a + \"-\"<\/span> + b + \"-\"<\/span> + c<\/span>
}<\/span>
<\/span>
scala> val<\/span> f1 = getAddress(\"china\"<\/span>)<\/span>
f1: (String<\/span>, String<\/span>) => String<\/span> = <function2><\/span>
<\/span>
scala> f1(\"beijing\"<\/span>,\"tiananmen\"<\/span>)<\/span>
res5: String<\/span> = china-beijing-tiananmen<\/span>
<\/span>
\/\/\u8fd9\u91cc\u5c31\u53ef\u4ee5\u7528\u67ef\u91cc\u5316\u53bb\u5b9a\u4e49\u65b9\u6cd5<\/span><\/span>
def<\/span> getAddress<\/span><\/span>(a: String<\/span>)(b: String<\/span>,c: String<\/span>): String<\/span> = { <\/span>
  \t\ta + \"-\"<\/span> + b + \"-\"<\/span> + c <\/span>
}<\/span>
\/\/\u8c03\u7528<\/span><\/span>
scala> getAddress(\"china\"<\/span>)(\"beijing\"<\/span>, \"tiananmen\"<\/span>)<\/span>
res0: String<\/span> = china-beijing-tiananmen<\/span>
<\/span>
scala> val<\/span> func1 = getAddress(\"a\"<\/span>) _<\/span>
scala> func1(\"c\"<\/span>, \"d\"<\/span>)<\/span>
res117: String<\/span> = a-c-d<\/span>
<\/span>
\/\/\u4e4b\u524d\u5b66\u4e60\u4f7f\u7528\u7684\u4e0b\u9762\u8fd9\u4e9b\u64cd\u4f5c\u5c31\u662f\u4f7f\u7528\u5230\u4e86\u67ef\u91cc\u5316<\/span><\/span>
List<\/span>(1<\/span>,2<\/span>,3<\/span>,4<\/span>).fold(0<\/span>)(_ + _)<\/span>
List<\/span>(1<\/span>,2<\/span>,3<\/span>,4<\/span>).foldLeft(0<\/span>)(_ + _)<\/span>
List<\/span>(1<\/span>,2<\/span>,3<\/span>,4<\/span>).foldRight(0<\/span>)(_ + _)<\/span>
<\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n","protected":false},"excerpt":{"rendered":"
\u6982\u5ff5 \u67ef\u91cc\u5316(currying, …<\/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\/131972"}],"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=131972"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/131972\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=131972"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=131972"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=131972"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}