Question

const arr = [
  { key: 'one', value: '1' },
  { key: 'two', value: '2' },
  { key: 'three', value: '3' },
] as const;

type Keys = GetKeys<typeof arr>;

如何定义GetKeys使得Keys为'one' | 'two' | 'three'？

Answer 1

您只想几次使用lookup type（也称为“索引访问类型”）从数组中获取数字键元素，然后从这些键的public async Task Play(CancellationToken cancel) { if (State == PlaybackState.Playing) return; if (RemainingAirTime == null) RemainingAirTime = ETimeSpan.FromSeconds(Display.Settings.ScrollTime); if (cancel.IsCancellationRequested) return; _ct = new Countdown(RemainingAirTime.BaseSpan); _ct.Elapsed += _ct_Elapsed; _ct.Start(); try { Draw(); }catch(System.Exception ex) { Blenet.Exceptions.ExceptionHandler.HandleException(ex, "Error while drawing", this); } State = PlaybackState.Playing; await Task.Delay(RemainingAirTime.BaseSpan, cancel); if(State == PlaybackState.Playing) await Reset(); } private void _ct_Elapsed(TimeSpan obj) { if (State == PlaybackState.Playing) RemainingAirTime = new ETimeSpan(obj); }键属性中获取：

"key"

希望有所帮助；祝你好运！

Link to code

如何获取数组项中嵌套属性的映射类型？

1 个答案: