目录

prefer_spread_collections

目录

Use spread collections when possible.

此规则自 Dart 2.3 版本起可用。

_规则集：recommended , flutter _

此规则提供 快速修复 。

详情

#

Use spread collections when possible.

Collection literals are excellent when you want to create a new collection out of individual items. But, when existing items are already stored in another collection, spread collection syntax leads to simpler code.

BAD:

dart
Widget build(BuildContext context) {
  return CupertinoPageScaffold(
    child: ListView(
      children: [
        Tab2Header(),
      ]..addAll(buildTab2Conversation()),
    ),
  );
}
dart
var ints = [1, 2, 3];
print(['a']..addAll(ints.map((i) => i.toString()))..addAll(['c']));
dart
var things;
var l = ['a']..addAll(things ?? const []);

GOOD:

dart
Widget build(BuildContext context) {
  return CupertinoPageScaffold(
    child: ListView(
      children: [
        Tab2Header(),
        ...buildTab2Conversation(),
      ],
    ),
  );
}
dart
var ints = [1, 2, 3];
print(['a', ...ints.map((i) => i.toString()), 'c');
dart
var things;
var l = ['a', ...?things];

使用方法

#

要启用 prefer_spread_collections 规则，请在你的 analysis_options.yaml 文件中，在 linter > rules 下添加 prefer_spread_collections ：

analysis_options.yaml
yaml
linter:
  rules:
    - prefer_spread_collections

除非另有说明，否则本网站上的文档反映的是 Dart 3.6.0。页面最后更新于 2025-02-05。 查看源代码 或 报告问题.