纯函数&根据id在树形结构中查找 

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>纯函数&在树形结构查id第三遍</title>
  </head>
  <body>
    <script>
      // 纯函数
      function getArea(r) {
        return Math.PI * r * r;
      }
      function memorize(func) {
        let obj = {};
        return function () {
          let key = JSON.stringify([...arguments]);
          if (!obj[key]) {
            obj[key] = func(arguments);
          }
          return obj[key];
        };
      }
      // 搞混了
      let a = memorize(getArea);
      console.log(a(5));

      function searchInTree(arr, id) {
        let result = null;
        if (!arr) {
          return;
        }
        for (let key in arr) {
          if (result !== null) {
            break;
          }
          if (arr[key].id === id) {
            result = arr[key];
            break;
          } else if (arr[key].children && arr[key].children.length > 0) {
            result = searchInTree(arr[key].children, id);
          }
        }
        return result;
      }
      
    </script>
  </body>
</html>

再写三遍，搞混了~~

posted @ 2022-04-09 11:40  苹果π  阅读(77)  评论(0)  编辑  收藏  举报