面试准备

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layout: post title: “2019-12-16-面试准备.markdown” date: 2019-12-16 12:11:30 +0800

通俗+干货

1. flutter各层的简单介绍
2. dart特点介绍

   语法

   .. 操作符/空指针优化 可以native运行; with,mixin,on; extension on; assert // assert 在生产模式无效 构造函数

优化使用

单接口优先使用Function 函数也是对象可以通过typeDef简化 Function 优于 dynamic PREFER inline function types over typedefs. DO override hashCode if you override == // the default behavior for == is identity, // Any two objects that are equal must have the same hash code. // Otherwise, maps and other hash-based collections // will fail to recognize that the two objects are equivalent 语言特性

线程设计

提几个重要的 Effective Dart
AVOID defining a one-member abstract class when a simple function will do.
AVOID defining a class that contains only static members.
AVOID type annotating initialized local variables
// 多使用var
List<List<Ingredient>> possibleDesserts(Set<Ingredient> pantry) {
  var desserts = <List<Ingredient>>[]; // var one
  for (var recipe in cookbook) { // var two
    if (pantry.containsAll(recipe)) {
      desserts.add(recipe);
    }
  }

  return desserts;
}

https://dart.dev/guides/language/effective-dart/design#do-use-terms-consistently

1. android启动等知识和最近版本更新 recycleView模仿