纯函数默写第一遍

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    <title>纯函数默写第一遍</title>
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  <body>
    <script>
      function getArea(r) {
        return Math.PI * r * r;
      }
      function memorize(func) {
        let obj = {};
        return function () {
          let key = JSON.stringify([...arguments]);
          if (!obj[key]) {
            console.log(123);
            obj[key] = func(...arguments);
          }
          return obj[key];
        };
      }
      let getOneArea = memorize(getArea);
      console.log(getOneArea(5));
      console.log(getOneArea(5));
      console.log(getOneArea(5));
      console.log(getOneArea(5));
      console.log(getOneArea(5));
      console.log(getOneArea(4));
    </script>
  </body>
</html>

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day10

原文地址：https://www.cnblogs.com/pengxiangchong/p/16101654.html