小编Mar*_*ato的帖子

强制 Typescript 对象只有一组键中的一个

基本问题和背景

我正在尝试输入一个对象数组,其中每个对象都具有一组中的一个键。例如:

const foo = [
  { a: 'foo' },
  { b: 'bar' },
  { c: 'baz' },
]
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我的第一次尝试是key in联合:

type Foo = { [key in 'a' | 'b' | 'c']: string }[]
const foo: Foo = [
  { a: 'foo' },
  { b: 'bar' },
  { c: 'baz' },
]
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这不起作用,因为 Typescript 希望每个对象都拥有联合中的所有键:

type Foo = { [key in 'a' | 'b' | 'c']: string }[]
const foo: Foo = [
  { …
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typescript

11
推荐指数
1
解决办法
2912
查看次数

Do multiple instances of System.Random still use the same seed in .Net Core?

I've seen several articles talking about not generating too many System.Random instances too closely together because they'll be seeded with the same value from the system clock and thus return the same set of numbers:

  1. /sf/answers/189457621/
  2. https://codeblog.jonskeet.uk/2009/11/04/revisiting-randomness/
  3. https://docs.microsoft.com/en-us/dotnet/api/system.random?view=netframework-4.8#instantiating-the-random-number-generator

That appears to be true for .net framework 4.8. Looking at the source code for .net core, however, it looks like instances of System.Random generated on the same thread are seeded from a [ThreadStatic] generator. So it would seem to …

c# .net-core

8
推荐指数
1
解决办法
107
查看次数

是否有任何"子包"用于导入反应虚拟化的部分?

是否有任何软件包/库/ etc我只能导入我需要的react-virtualizationized部分?对于lodash,有点像https://www.npmjs.com/package/lodash.debounce吗?

import npm react-virtualized

0
推荐指数
1
解决办法
205
查看次数

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.net-core ×1

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react-virtualized ×1

typescript ×1