{"id":402,"date":"2022-06-23T16:32:49","date_gmt":"2022-06-23T16:32:49","guid":{"rendered":"http:\/\/114.132.224.28\/?p=402"},"modified":"2022-06-23T16:32:49","modified_gmt":"2022-06-23T16:32:49","slug":"%e8%ae%a8%e8%ae%bacompose-%e9%93%be%e5%bc%8f-%e7%ae%a1%e9%81%93%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"http:\/\/localhost\/2022\/06\/23\/%e8%ae%a8%e8%ae%bacompose-%e9%93%be%e5%bc%8f-%e7%ae%a1%e9%81%93%e9%97%ae%e9%a2%98\/","title":{"rendered":"\u8ba8\u8bbacompose\/\u94fe\u5f0f\/\u7ba1\u9053\u95ee\u9898"},"content":{"rendered":"\n<p>\u8fd9\u4e09\u8005\u5176\u5b9e\u90fd\u662f\u4e00\u4e2a\u4e1c\u897f\uff0c\u628a\u51fd\u6570\u7ec4\u5408\u8d77\u6765\uff0c\u800c\u51fd\u6570\u53ef\u4ee5\u7ec4\u5408\u8d77\u6765\u662f\u56e0\u4e3a\u4ed6\u4eec\u63a5\u53d7\u7684\u548c\u8fd4\u56de\u7684\u662f\u540c\u4e00\u79cd\u7c7b\u578b\u3002<\/p>\n\n\n\n<p>\u50cfml,compose\u53ef\u4ee5\u5199\u6210 f o g,\u4e5f\u53ef\u4ee5\u5199\u6210g |=&gt; f<\/p>\n\n\n\n<p>\u89e3\u51b3\u4ec0\u4e48\u95ee\u9898\uff1a<\/p>\n\n\n\n<ul><li>\u6309\u4e00\u5b9a\u987a\u5e8f\u6267\u884c\u4e00\u7ec4\u65b9\u6cd5\uff0c\u5bf9\u6570\u636e\u8fdb\u884c\u52a0\u5de5\uff0c\u50cf\u7ba1\u9053\u4e00\u6837<\/li><\/ul>\n\n\n\n<p>\u5b9e\u73b0\u4e00\u4e2a\u7b80\u5355\u4e3a\u4e00\u4e2a\u6570\u6307\u5b9a\u4e00\u5b9a\u987a\u5e8f\u7684\u64cd\u4f5c\uff1a\uff08ml\u9012\u5f52compose\u7248\u672c\uff09<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>const compose = (f, g) =&gt; (x) =&gt; f(g(x))\nconst reduceRecursion = (arr, f, acc) =&gt; {\n  if (arr.length === 0) return acc\n  if (typeof acc === 'undefined') acc = arr.shift()\n  const current = arr.shift()\n  return reduceRecursion(arr, f, f(acc, current)) \/\/ \u6bcf\u6b21current\u90fd\u4f1a\u5148\u662fg\uff0c\u6240\u4ee5\u5148\u63a5\u53d7\u53c2\u6570\uff0c\u7136\u540e\u8fd4\u56de\u51fd\u6570\uff0c\u8fd9\u4e2a\u51fd\u6570\u53c8\u4f1a\u6210\u4e3a\u4e0b\u4e00\u4e2a\u51fd\u6570\u7684f\uff0c\u4e0b\u4e00\u4e2acurrent\u53c8\u4f1a\u5148\u751f\u6210\u533f\u540d\u51fd\u6570\u5148\u5f97\u5230\u53c2\u6570\u8fd0\u884c\u7ed3\u679c\u518d\u4f20\u5165f\u4e2d\n}\nreduceRecursion(&#91;x =&gt; x + 1, x =&gt; x * 2], compose)(1) \/\/ 3 \u6240\u4ee5\u8fd9\u91cc\u7684\u987a\u5e8f\u5c31\u662f\u5f97\u5230*2\u7684\u7ed3\u679c\u518d\u52a01\n\/\/ \u90a3\u4e48\u5982\u679c\u60f3\u6309\u987a\u5e8f\u5e0c\u671b\u5148\u6267\u884c+1\nconst composeOpposed = (f, g) =&gt; (x) =&gt; g(f(x))\nreduceRecursion(&#91;x =&gt; x + 1, x =&gt; x * 2], composeOpposed)(1) \/\/ 4<\/code><\/pre>\n\n\n\n<p>\u8003\u8651\u8fd9\u4e2a\u51fd\u6570\u60f3\u52a0\u70b9\u526f\u4f5c\u7528\uff0c\u6bd4\u5982\u8bf4\u60f3\u6269\u5145\u4e00\u4e2a\u6253\u5370\u529f\u80fd<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>reduceRecursion (&#91;f =&gt; x =&gt; f(x+1), f =&gt; x =&gt; f(x*2)], compose)(console.log)(1) \/\/  4<\/code><\/pre>\n\n\n\n<p>\u8fd9\u91cc\u7684\u60c5\u51b5\u5c31\u4f1a\u53d1\u751f\u6539\u53d8\uff0c*2\u4f1a\u5148\u62ff\u5230console.log\uff0c\u7136\u540e\u8fd4\u56de\u533f\u540d\u51fd\u6570\uff0c+1\u4f1a\u62ff\u5230*2\u7684\u533f\u540d\u51fd\u6570\uff0c\u5f97\u5230\u5305\u542b*2\u7684\u533f\u540d\u51fd\u6570\uff0c\u7136\u540e1\u88ab\u4f20\u8fdb+1\u7684\u533f\u540d\u51fd\u6570\u91cc\u9762\u3002\u9996\u5148\u5f97\u5230+1\uff0c+1\u540e\u7684\u7ed3\u679c\u4f1a\u4f5c\u4e3a\u53c2\u6570\u4f20\u5165*2\u7684\u533f\u540d\u51fd\u6570<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2022\/06\/compose.png\" alt=\"\" class=\"wp-image-408\"\/><\/figure>\n\n\n\n<p>\u5728\u770b\u4e00\u4e2atypescript\u7248\u672c,\u63a5\u53d7sideEffect\u540e\u8fd4\u56de\u51fd\u6570\uff0c\u5e76\u5e94\u7528sideEffect,\u6b64\u65f6\u88ab\u4f20\u9012\u7684\u53c2\u6570\u53d8\u4e3a\u5e26\u6709sideEffect\u7684\u51fd\u6570\uff0c\u800c\u4e0d\u662f\u6700\u521d\u7684\u6570\u5b57\uff0c\u76f8\u6bd4\u4e4b\u524d\u62ff\u5230\u503c\uff0c\u76f4\u63a5\u6d41\u5165\u524d\u4e00\u4e2a\u51fd\u6570\uff0c\u6b64\u65f6\u6d41\u5165\u65e7\u7684\u51fd\u6570\u4e0d\u518d\u662f\u503c\uff0c\u800c\u662f\u4e00\u4e2a\u51fd\u6570\uff0c\u5f97\u5230\u7684\u662f\u65e7\u51fd\u6570\u5305\u88c5\u51fd\u6570\uff0c\u5f97\u5230\u5916\u754c\u4f20\u503c<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>type SideEffectFunType&lt;T,R&gt; = (f: (x: R) =&gt; T) =&gt; (x: R) =&gt; T\ntype ComposeFunType&lt;T&gt; = (x: T) =&gt; T\n\nconst compose: &lt;T&gt;(f: ComposeFunType&lt;T&gt;, g: ComposeFunType&lt;T&gt;) =&gt; ComposeFunType&lt;T&gt; = (f, g) =&gt; (x) =&gt; f(g(x))\n\nconst reduceRecursion: &lt;T, R&gt;(\n  arr: (SideEffectFunType&lt;T, R&gt;)&#91;], \n  f: (acc: SideEffectFunType&lt;T, R&gt;, current: SideEffectFunType&lt;T, R&gt;) =&gt;  SideEffectFunType&lt;T, R&gt;, \n  acc?: SideEffectFunType&lt;T, R&gt;\n  ) =&gt; SideEffectFunType&lt;T, R&gt; = (arr, f, acc) =&gt; {\n  if(arr.length === 0) throw new Error(\"no value\")\n  if(arr.length === 1) return arr&#91;0]\n  const formatAcc = typeof acc === 'undefined'? arr.shift() : acc\n  const current= arr.shift()\n  return reduceRecursion(arr, f, f(formatAcc!, current!))  \/\/\u6bcf\u6b21current\u90fd\u4f1a\u5148\u662fg\uff0c\u6240\u4ee5\u5148\u63a5\u53d7\u53c2\u6570\uff0c\u7136\u540e\u8fd4\u56de\u51fd\u6570\uff0c\u8fd9\u4e2a\u51fd\u6570\u53c8\u4f1a\u6210\u4e3a\u4e0b\u4e00\u4e2a\u51fd\u6570\u7684f\uff0c\u4e0b\u4e00\u4e2acurrent\u53c8\u4f1a\u5148\u751f\u6210\u533f\u540d\u51fd\u6570\u5148\u5f97\u5230\u53c2\u6570\u8fd0\u884c\u7ed3\u679c\u518d\u4f20\u5165f\u4e2d\n}\n\nreduceRecursion&lt;void, number&gt; (&#91;f =&gt; x =&gt; f(x+1), f =&gt; x =&gt; f(x*2)], compose)(console.log)(1)<\/code><\/pre>\n\n\n\n<p>\u518d\u770b\u770b\u4e0d\u662f\u9012\u5f52\u7684\u5b9e\u73b0\uff0c\u6700\u521d\u59cb\u90a3\u4e2a\u51fd\u6570\u4f1a\u62ff\u5230\u5916\u5c42\u7684sideEffect\uff0c\u7136\u540e\u88ab\u65b0\u51fd\u6570\u8c03\u7528\uff0c\u65b0\u51fd\u6570\u4f1a\u662f\u90a3\u4e2a\u5305\u88c5\u51fd\u6570\u5f97\u5230\u5916\u754c\u4f20\u503c<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>function replace(arr, sideEffect) {\n  arr.forEach(el =&gt; {\n     sideEffect = el(sideEffect)\n  })\n  return sideEffect\n}\nreplace(&#91;f =&gt; x =&gt; f(x+1), f =&gt; x =&gt; f(x*2)], console.log)(1)  \/\/ 3 \u8fd9\u79cd\u4e0d\u7528compose\u76f4\u63a5\u6bcf\u6b21\u66ff\u6362\u6210\u4e00\u4e2a\u65b0\u7684sideEffect,\u5148+1\u62ff\u5230\u526f\u4f5c\u7528\uff0c\u81ea\u5df1\u53c8\u88ab\u4e0b\u4e00\u4e2a\u51fd\u6570\u5f53\u505a\u526f\u4f5c\u7528\uff0c\u6700\u540e\u90a3\u4e2a\u51fd\u6570\u4f1a\u6700\u5148\u62ff\u5230\u53c2\u6570\nreplace(&#91;x =&gt;x+1, x =&gt; x*2], 1) <\/code><\/pre>\n\n\n\n<p>\u8fed\u4ee3\u662f\u5148\u6267\u884c\uff0c\u524d\u8005\u4f1a\u88ab\u540e\u8005\u5f53\u505a\u53c2\u6570\u8c03\u7528<\/p>\n\n\n\n<p>\u9012\u5f52\u662f\u56e0\u4e3acompose\u662f\u5148g(x)\u518df(g(x))\uff0c\u6240\u4ee5\u662f\u5148\u6267\u884c\u540e\u8005\uff0c\u540e\u8005\u88ab\u5f53\u505a\u53c2\u6570\u8c03\u7528<\/p>\n\n\n\n<p>\u9012\u5f52\u5982\u679c\u7528\u7684\u662fcomposeOppsed\u90a3\u4e48\u987a\u5e8f\u5c31\u8ddf\u8fed\u4ee3\u4e00\u6837<\/p>\n\n\n\n<p>\u9012\u5f52\u7248\u672c\u8981\u5b9e\u73b0\u80fd\u6700\u6700\u540e\u4e00\u4e2a\u6355\u83b7\u9519\u8bef\u5c31\u8981\u7528composeOppsed<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>reduceRecursion(&#91;fn =&gt; x =&gt; fn(x + 1), fn =&gt; x =&gt; { throw new Error('error') }, fn =&gt; x =&gt; {\n  try {\n    return fn(x)\n  } catch (error) {\n    console.log(error)\n  }\n}], composeOpposed)(console.log)(1)<\/code><\/pre>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8fd9\u4e09\u8005\u5176\u5b9e\u90fd\u662f\u4e00\u4e2a\u4e1c\u897f\uff0c\u628a\u51fd\u6570\u7ec4\u5408\u8d77\u6765\uff0c\u800c\u51fd\u6570\u53ef\u4ee5 &hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"_links":{"self":[{"href":"http:\/\/localhost\/wp-json\/wp\/v2\/posts\/402"}],"collection":[{"href":"http:\/\/localhost\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/localhost\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/localhost\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/localhost\/wp-json\/wp\/v2\/comments?post=402"}],"version-history":[{"count":0,"href":"http:\/\/localhost\/wp-json\/wp\/v2\/posts\/402\/revisions"}],"wp:attachment":[{"href":"http:\/\/localhost\/wp-json\/wp\/v2\/media?parent=402"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/localhost\/wp-json\/wp\/v2\/categories?post=402"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/localhost\/wp-json\/wp\/v2\/tags?post=402"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}